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1. Three sub displays are available in the following sub display order 1 Hp 10 h Dose Rate Alarm ON 2 Hp 10 h Dose Rate Alarm ON Hp 0 07 h Dose Rate Alarm ON To display and or set dose rate Gr T alarm OFF thresholds press the e button until this display appears A P LI P Ih Three sub displays are available 1 Hp 10 h Dose Rate Alarm OFF 2 Hp 10 h Dose Rate Alarm OFF Hp 0 07 h Dose Rate Alarm OFF The EPD can perform the role of a personal alarming EPD with alarm thresholds for dose rate There are two Hp 10 h dose rate alarms and a single Hp 0 07 h dose rate alarm that can de displayed The 2 Hp 10 h dose alarm has the higher priority and should always be set to a higher value than the 17 Hp 10 h alarm The alarm thresholds can be modified by the user if required but only when the EPD default setting is set to adjustable The user is barred from modifying the thresholds if the EPD default is set to not adjustable These default settings can only be set via the IR communications link The dose rate alarm thresholds can be set using the button as follows 10uSv h 50uSv h 100uSv h 500uSv h 1mSv h 5mSv h 10mSv h 50mSv h 100mSv h 500mSv h 1 0Sv h ISSUE 9 Thermo Scientific Page 37 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK OPERATING INSTRUCTIONS Page 38 Other values for the dose rate alarm thresholds may be set via the IR communication
2. Figure 4 2 EPD Infra Red Interface Communicating With The EPD The EPD electronically stores dose and dose rate data together with other information that is required to control and configure the EPD Communication with the EPD is essential in order to read data from store and to write data to store so that EPD parameters operational control and general functionality can be set During the read write process the EPD can be configured for any or all of the display selections shown in Figure 3 4 to be made available to the user as required Only limited functions can be configured via the EPD button On the front of the EPD there is an IR communications link for reading and writing data Communication with the EPD is usually via an IR adapter which is connected to a host PC EasyEPD2 is a Thermo PC based software product for maintaining configuring and reading EPDs The IR communication range is up to 1m over an angle of 30 from the normal to the front of the EPD After any successful communication via the IR communications link the EPD will show the default display There is a time out from the last communication after which the EPD reverts to normal display There is also an inhibit timer that prevents an EPD from re establishing communications immediately after ISSUE9 Thermo Scientific Page 51 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK TECHNICAL DESCRIPTION communications are completed This gives the user
3. The time to Hp10 1 Dose Alarm is calculated from the Hp10 dose rate as Hp10 1 Threshold Hp10 Dose rate The time may be displayed on the EPD and is updated each time the dose rate is re calculated The maximum value is 99 59 99 Hours 59 Minutes which occurs if the dose rate is OuSv h or the time to alarm is greater than 100 hours or the EPD is not accumulating dose ISSUE 9 Thermo Scientific Page 27 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK OPERATING INSTRUCTIONS 3 5 1 3 5 Display Options and Button Functions The following sections describe typical displays that a user may see within each of the menus shown in Figure 3 4 This description assumes that all displays are enabled The user may have access to any or none of the displays depending on how the EPD has been configured To call up a top level display press and hold the button until the relevant top level display appears Any sub displays are selected either by short pressing or double pressing the button within the display default time out Displaying Hp 10 Dose Dose Rate and User ID To display Hp 10 doses press SCC T and hold the button until this top CH yu H 10 level display appears A dal i Three sub displays are available in the following sub display order Hp 10 Dose Hp 10 h Dose Rate User ID Digits Hp 10 Dose Display Short press the button to display the a Ki current dose This dose p
4. 5 3 Internal Logging of Fault Conditions 5 3 1 EPD Status Faults Record 5 3 2 Page 70 The EPD logs data to an internal data record in EEPROM to indicate that faults have occurred These faults are as follows Event Logged Communication Error Cal Factors Bad EEPROM Fail Bad Sectors Detector Test Fail Detector Threshold Fail Radio Fail Other Fault Disabled An event dose alarm or a fault has been logged in the EPD s event history store Communication with the EPD failed typically the unit was removed from the Reader prematurely The EPD calibration factors failed a CRC check and cannot be recovered from secure store An un recoverable EPD secure store failure occurred The number of bad EPD secure store sectors There is a maximum of nine spare sectors The EPD detector test was run and the number of counts received were less than required to pass the test The EPD detector thresholds failed to load successfully Reserved for future use A fault occurred causing the EPD to reset The EPD is Off not calculating dose This data may be read and cleared via the IR communications link amp EasyEPD2 Event History store The EPD logs up to 23 events in a non volatile store together with a time stamp The Event History store is accessible when the EPD is interrogated over the IR communications link e g by EasyEPD2 Alarm and fault events are recorded see Tables 4 1 an
5. The EPD BG and EPD G dosimeters are highly sophisticated monitors sensitive to gamma and X rays photons in the following energy range gamma X rays 15 keV to 10 MeV In addition the EPD BG dosimeter is sensitive to beta radiation energetic electrons in the following energy range Beta radiation 250 keV to 1 5 MeV mean energy A full list of radiological characteristics and specifications can be found in Appendix A to this Handbook Radiation detected by the three silicon diode detectors two in the case of the EPD G is combined to give the following dose equivalents as defined by ICRU Document 47 i Hp 10 personal dose equivalent at a depth of 10mm of tissue penetrating deep or whole body dose ii Hp 0 07 personal dose equivalent at a depth of 0 07 mm of tissue superficial shallow or skin dose The EPD calculates both the accumulated dose and the dose rate for Hp 10 and Hp 0 07 These and other data are stored in an internal store EEPROM within the EPD A button in the EPD case allows the user to retrieve this data from store select a range of displays acknowledge alarms and perform user control functions Data is displayed to the user on a LCD display on the top of the EPD see Figure 2 1 To minimise the loss of data from battery or other failure data is saved to secure memory within the EPD every 15 minutes Data is written to and read from the EPD via an integra
6. Thermo Fisher Scientific 2009 ALL RIGHTS RESERVED REPRODUCTION IN WHOLE OR IN PART OF ALL MATERIAL IN THIS PUBLICATION INCLUDING DRAWINGS AND DIAGRAMS IS FORBIDDEN THIS INSTRUCTION MANUAL IS CONFIDENTIAL TO THERMO FISHER SCIENTIFIC AND IS SUPPLIED FOR USE ONLY IN CONNECTION WITH THE OPERATION AND OR MAINTENANCE OF THE EQUIPMENT TO WHICH IT RELATES AS SUPPLIED BY THERMO FISHER SCIENTIFIC THE CONTENTS MUST NOT BE USED FOR OTHER PURPOSES NOR DISCLOSED TO ANY THIRD PARTY WITHOUT THE PRIOR WRITTEN CONSENT OF THERMO FISHER SCIENTIFIC Thermo Fisher Scientific Bath Road Beenham Reading Berkshire RG7 5PR England Tel 0118 971 2121 Fax 0118 971 2835 ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 MANUFACTURERS DETAILS amp ISSUE STATE MANUFACTURERS DETAILS Manufacturer s Address Thermo Fisher Scientific Environmental Instruments Division Radiation Measurement amp Protection Bath Road Beenham Reading Berkshire United Kingdom RG7 5PR e mail service epd uk thermo com Tel 0118971 2121 Fax 0118971 2835 USA Sales Office Thermo Fisher Scientific Environmental Instruments Division Radiation Measurement amp Protection 200R Hembree Park Drive Roswell Georgia 30076 U S A e mail epdsupport rmp thermo com Tel 770 521 4500 Fax 770 521 4535 ISSUE STATE Pages Issue Type Part ID File ID Change Ref Front Sheet 9 ESERS EPD HB 40521 000 HB40521_000_ cover_iss9 Balance 9 ESER
7. ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 4 6 10 TECHNICAL DESCRIPTION Dose Profile The EPD stores Hp 10 and Hp 0 07 dose to a resolution of 1uSv in non volatile store so that a profile of the dose over time can be recreated The interval between stores is set up via the IR communications link Both Hp 10 and Hp 0 07 dose information is stored as a dose profile the minimum interval between entries in the dose profile is adjustable between 2 seconds to 35 hours in 2 second intervals The store holds up to 579 records for transitions up to 127 uSv or less Note A dose profile interval of zero seconds turns off the dose profile function Dose profile can only be read via the IR communications link Dose profile may be synchronised to a particular time in the future e g hourly logging on the hour Note The EPD has no concept of real time but maintains a one second tick that is valid as long as the EPD is powered and not reset Additional profile records are made if the dose has changed since the last dose profile record when the EPD is De Issued or the EPD is turned from On to Off mode An additional record is made when the EPD Dose is Cleared even if the previous profile record was zero ISSUE9 Thermo Scientific Page 63 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK TECHNICAL DESCRIPTION 4 6 11 Event History Store The EPD logs up to 23 events in non volatile store together with a time sta
8. EPD faults are cleared they will recur if the fault is still present EPD dose rate alarms are cleared EPD counters are base lined The Return for read time is set to now plus the number of hours 1 to 31 in the EPD Return for Read Offset 0 no change in Return for Read time VVVVVVV EasyEPD2 may be used to configure the Return for Read offset value NOTE Removing the battery and replacing it does NOT change the EPD mode from Off to ON the mode is unchanged and the ClearOnON does not operate 4 6 13 Pulsed Rate Facility The pulsed Rate facility allows the EPD to be used as an alarming dosemeter when used in an environment where pulsed fields may be present The EPD should be configured so that the rate alarm will occur should the wearer be unexpectedly in the pulsed field The characteristics of the device causing the pulsed field would determine this setting and can also be used to estimate the actual dose accrued It is recommended that you consult with the manufacturer if you wish to use the EPD in this mode When the EPD is manufacturer configured to Pulsed Rate Mode then the Hp10 dose rate gives a faster dose rate response The EPD has to be configured in Fast dose rate mode and one of the Pulsed rate thresholds 0 125 0 25 0 5 or 1 uSv second selected In this mode when the EPD recognises a dose rate above the selected threshold it immediately calculates the instantaneous dose rate based on the dose in
9. Page 40 Button Beep Enable Disable The EPD can be configured to beep every time the button is pressed This feature may be toggled on and off via the button or via the IR communications link i e EasyEPD2 Note If the button beep has been disabled via the button any subsequent initialisation of the EPD will revert the button beep to ON enabled If the button beep has been disabled via the IR communications link the button beep will remain disabled regardless of any subsequent EPD initialisation Short press the button to display the button beep enable disable i window To configure the beep E w C Y feature off or on double press the VS Vand Vom button while the EPD is displaying the following displays Button Beep Enabled i A Button Beep Disabled Dose Chirp Adjustment The EPD can be configured to give a warning chirp at every preset increment in Hp 10 h penetrating deep dose This increment can be set between 0 01uSv and 100uSv or disabled by setting the increment to 0 Short press the button to display the current dose per chirp y NY i p ld Ly Hp 10 An increment set to 1uSv is shown opposite With a chirp sensitivity of i 1tuSv chirp and a dose rate of 10mSv h t a the sounder will average 2 8 chirps every 1uSv second es TIME ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 OPERATING INSTRUCTION
10. 5 gt a 15 5 Detector Locations Figure 4 1 EPD Dimensions Note in the case of the EPD G Dosemeter the Beta window is blocked and Beta detector not fitted ISSUE9 Thermo Scientific Page 49 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK TECHNICAL DESCRIPTION 4 4 Environmental Description 4 4 1 Environmental Characteristics Operating Temperature 10 C to 50 C Storage 25 C to 70 Humidity 20 to 90 RH non condensing Protection IP55 Total protection against dust and against low pressure jets of water from all directions Vibration IEC 1526 2g 15 min 10 33 Hz Shock 1 5 m drop on each surface onto concrete EMI EMC Exceeds MIL STD 461D RS103 see Appendix B 4 4 2 Brief Environmental Description The EPD is designed for use in the following environments Office and Laboratory environment Industrial environments Hospitals Military environments including dockyards and shipping but excluding exposure to salt water and extremes in military environment ISSUE 9 Page 50 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 4 5 4 5 1 TECHNICAL DESCRIPTION Infra red Interface The EPD contains an infra red interface see Figure 4 2 which can optically communicate read and write to PC based hardware using a suitable infra red communications program This interface is compatible with IrDA level 1 protocol IR Adapter
11. 88 Wearing an EPD icon ibi 13 NEIE linda tota e co er O ea e O O e o e o ae 4 48 X LEE E 5 ISSUE 9 Thermo Scientific Page 115
12. 9 Page 106 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 APPENDIX C Aa HH Bb Cc IL Dd jd Ee E Ff F Gg Y BHhk li li Jj J Kk JP ULI L Mm J Nn in Oo o Pp F Qa Rr r Ss JG Tt E Uu ly Vv Ww H Xx h Yy 4 Zz p o jf fl 12 013 J 4 Us 5 6 6 7 1 8 Ha H Seven Segment Display representation of the character s to the left WEARER NAME EPD LCD LETTER REPRESENTATION Thermo Scientific ISSUE 9 Page 107 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK APPENDIX D This page intentionally left blank ISSUE 9 Page 108 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 APPENDIX D APPENDIX D EPD FAULT LOG FORM SEE OVER ISSUE 9 Thermo Scientific Page 109 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK APPENDIX D This page intentionally blank ISSUE 9 Page 110 Thermo Scientific EPD FAULT LOG FORM Owning Organisation Site or Location REPORT NO Related Repeated Report Nos Raised By Date Contact Telephone ddimm yyy No EPD Supplier Thermo or Distributor Form Returned to BATTERY Type Alkaline or LTC Supplied by EPD Serial No s EPD Type EPD BG EPD G EPD N2 Date Time fault occurred Fault type e g Display fault Code Customer fault reference EPD returned to supplier Date battery installed Do IR com
13. LI ySv h displayed the actual reading is rounded down Display Range OuSv h to gt 4 0Sv h auto ranging Note Over range gt 1 0 Sv h is indicated with a flashing LCD display see section 3 2 4 This condition is latched to warn the user that the dose value may be inaccurate ADS User ID Digits An additional User ID is provided called Approved Dosimetry Service ADS User ID This is password protected and is used by ADS systems for permanent issue EPDs The ADS User ID may be displayed in a similar fashion to the User ID Short press the button again to display each of the remaining ADS User ID digit displays A non issued EPD may have an ADS User ID FFFFFFFFFFFF Typically an ADS User ID will have fewer than 12 digits but it must be an integer between 1 and 999999999999 For example an ADS User ID 3324 will be shown on the LCD display as follows First Display Second Display Third Display LO a e K AI ISSUE 9 Page 30 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 3 5 3 3 5 4 OPERATING INSTRUCTIONS In systems using 8 or fewer digits for the ADS User ID it is usual to disable and thereby remove the unused displays e g the first and second display in the above example Displaying Total Dose To display total dose press D and hold the button until this GE top level display appears CG Cu Two sub displ
14. a number of menus each having a top level display Menus are changed by holding down the button Long Press This navigates the user down the left hand side of Figure 3 4 Once the desired menu has been reached the button must be released Then by a series of short presses the user can navigate across Figure 3 4 until the desired display within the current menu has been reached Any displays that are disabled are removed from the sequence Some displays are usefully disabled if their retention might confuse the wearers of the EPD Other displays should be disabled if their retention might cause an operational risk for example the ability to zero dose or adjust alarm thresholds Such display configuration is easily done using the EasyEPD2 software package A batch write facility is available in EasyEPD2 to enable the speedy configuration of a number of EPD units Some displays allow the user to change the status or operation of the EPD For example the user can start stop and reset the countdown timer In general these operations are activated by double pressing the button To prevent unwanted user intervention e g to prevent the user resetting count down timer the EPD can be configured to disable any or all of the displays shown in Figure 3 4 Display configuration changes can only be carried out via the IR communications link ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 3 4 OPERAT
15. belt is prohibited the lanyard may be the most practical method of wearing the EPD EPD and Lanyard EPD attached to breast pocket EPD attached to belt UN UN YU Figure 2 5 Wearing An EPD Note The lanyard cannot be fitted without first removing the lanyard plate see Section 6 3 1 ISSUE 9 Thermo Scientific Page 13 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK GETTING STARTED Page 14 When the EPD is worn on the outside of protective clothing to minimise the risk of contamination of the EPD consideration should be given to wearing the EPD ina suitably sealed plastic bag WARNING DURING OPERATIONAL USE THE EPD MAY BECOME EXPOSED TO RADIOACTIVE CONTAMINATION THE ERD MUST BE SUBJECT TO ALL RELEVANT DECONTAMINATION PROCEDURES LAID DOWN BY THE RADIOLOGICAL PROTECTION AUTHORITY ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 3 1 OPERATING INSTRUCTIONS SECTION 3 OPERATING INSTRUCTIONS This section explains the essential functions performed by the EPD and describes operating instructions that will allow the user to display data acknowledge alarms and operate the EPD LCD Display and Backlight A custom designed LCD display on the top of the EPD provides a visual interface for viewing dose and other EPD data The EPD display is illustrated in Figure 3 2 wh
16. but extending greatly in zero fields Alarms amp Alarms 2 x Hp 10 dose and dose rate alarms 1 x Hp 0 07 Other dose and dose rate alarms Count down alarm stop Functions watch Return for read alarm Fault alarms Over range alarms Dose rate and over range alarm status is latched for subsequent system analysis Special Total 12 entries for recording end of month dose etc Dose Store Count down Configurable up to 1 hour 39 minutes and 59 seconds Timer 1 second resolution Page 104 ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 In built Integrity Checks ADS Facilities System Integration Facilities Detector Test Non volatile store Processing Memory checks Calibration Dose Data verification ADS Issue ADS Store Messaging Interface EPD Identity Mark Number Wearer ID User ID Wearer Name Thermo Scientific APPENDIX C Regular flash LED detector test also available on demand over the communications link at time of issue The test takes approximately 1 to 2 ms during which time normal dose measurement is inhibited Dose data copied to non volatile store every 15 minutes and more regularly to dose profile Critical data areas dose stores calibration factors communications data are all protected by powerful 16 bit polynomial crc Cyclic Redundancy Check EPDs normally supplied with Calibration factors in the
17. considered as unusable and the manufacturer contacted for advice ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 MAINTENANCE 6 4 4 Periodic Cleaning The EPD should be cleaned by wiping it over periodically with a cloth lightly dampened with a solution of water and up to 5 of a neutral water based detergent ISSUE 9 Thermo Scientific Page 95 EPD HB 40521 000 APPENDIX A ELECTRONIC PERSONAL DOSEMETER HANDBOOK APPENDIX A RADIOLOGICAL SPECIFICATIONS The following specifications quoted apply under standard conditions of 20 C Energy response Photon Hp 10 Photon Hp 0 07 Beta Hp 0 07 Angular response Hp 10 Cs 137 Hp 10 Am 241 Hp 0 07 Cs 137 Hp 0 07 Am 241 Hp 0 07 Sr 90 Accuracy Hp 10 Cs 137 Hp 0 07 Cs 137 Hp 0 07 Sr 90 Dose rate linearity Hp 10 Cs 137 Hp 0 07 Cs 137 Hp 0 07 Sr 90 50 15keV to 17keV Ref Cs 137 20 17keV to 1 5MeV Ref Cs 137 30 1 5MeV to 6MeV Ref Cs 137 50 6MeV to 10MeV Ref Cs 137 30 20keV to 6MeV Ref Cs 137 50 6MeV to 10MeV Ref Cs 137 30 250keV to 1 5MeV ref Sr 90 EPD BG only average beta energy 20 up to 75 50 up to 75 20 up to 75 50 up to 60 30 up to 55 EPD BG only 110 115 20 EPD BG only 10 lt 0 5Sv h 20 0 5Sv h to 1Sv h 30 1Sv h to 2Sv h 20 lt 0 5Sv h 20 0 5Sv h to 1Sv h 30 1Sv h to
18. in Sections 3 5 1 and 3 5 2 User identification can only be set via the IR communications link ISSUE9 Thermo Scientific Page 55 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK TECHNICAL DESCRIPTION 4 6 5 Page 56 Dose and Dose Rate The EPD calculates dose and dose rate Dose is accumulated in 3 stores Dose Total Dose and ADS Dose Dose rate is the current rate calculated by the EPD Dose The EPD displays Hp 10 penetrating or deep dose and Hp 0 07 superficial or shallow dose Dose is regarded as a short term record of dose received usually associated with the issue of an EPD It is this value that is compared with dose alarm thresholds and an alarm raised if the value exceeds the thresholds The EPD records Dose Total Dose and ADS Dose in units of 1 64uSv although this is displayed as a decimal equivalent Total Dose is a store providing a long term record of dose accumulated by the EPD The LCD display can be set to auto range between 1uSv to 16Sv maximum resolution 1uSv Accumulated dose is written to non volatile memory at least every 15 minutes Therefore is a reset occurs due to the battery cap being removed or the EPD being heavily dropped or a passivated battery fitted up to 15 minutes of accumulated dose may be lost Such events however are detected and a count of resets provided as quality data associated with the accumulated dose see section 4 6 7 Note that from software version 11 EPDs it
19. is possible to configure the EPD to make additional logs to the non volatile memory at 1 minute intervals if the dose received in the preceding minute exceeds 1 uSv Display characteristics that can be set are Units Sv or rem Decimal Places 2 or 3 decimal places Resolution uSv or mSv Default Time 10 to 99 seconds Note For Gamma dose two counts are approximately equivalent to 1 64uSv and for Beta dose one count is approximately 1 6uSv To avoid statistical inaccuracies doses should only be displayed in micro sieverts or 0 1 rem but when summing a number of doses the full resolution should be used to minimize rounding errors Dose Rate This is the current dose rate as calculated by the EPD It may be viewed on the display or read via the IR communications link Dose rates are calculated using an averaging algorithm to reduce statistical variations to within 20 under most conditions This results in increased averaging time constants at low dose rates Averaging time constants used to calculate penetrating dose rate Hp 10 n maximise at 60 seconds below 70uSv h and therefore the statistical errors ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 4 6 6 TECHNICAL DESCRIPTION increase as the dose rate drops below 70uSv h Additional processing is used to provide faster response but with reduced accuracy when rapid changes in dose rate are observed The algorithm is a compromise that reduces
20. knocked ISSUE 9 Thermo Scientific Page 81 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK FAULTS AND RECOVERY ACTIONS Code Text as displayed by EPD Action Recommended Remarks EasyEPD2 Customer Action A EA ASE NES A Hard Gamma detector fail None continues Reset unit Only the first normal processing Return to detector to fail is supplier if logged recurs normal processing normal processing detector fail normal processing CRC error Dose Alarm Logs fault and Reset unit Indicates Thresholds performs reset Return to corruption of data without doing log supplier if in RAM Up to 15 first This means that recurs mins of dose good data is read could be lost back from the EEPROM For the ADS and Dose data the QF bits are also set This is done by reading the data from EEPROM setting the bit calculating the new checksum restoring the data to EEPROM and then doing a reset The correct values will then be restored on program restart 095 CRC error Rate Alarm ditto ditto ditto Thresholds 096 CRC error ADS Data 097 CRC error Calibration ditto ditto ditto Factors CRC error Dose Data only the first detector to fail is logged IRDA Module Code Text as displayed by Recommended Remarks EasyEPD2 Customer Action red ee y oe 00 IRDA Module Error Reserved for future use Table 5 2 EPD Faults Logged to History Event Store ISSUE 9 Page
21. plate towards the bottom of the EPD so as to disengage the lanyard plate from the retaining lugs Remove the lanyard plate Push Lanyard Plate Towards The Bottom Apply Downward Leverage Gently Clip Assembly Removed For Clarity Figure 6 4 Removing the EPD Lanyard Plate Clip Assembly 6 3 2 Replacing The EPD Lanyard Plate Clip Assembly Set the lanyard plate into the recess on the rear of the EPD body This will be found to be much easier if the clip and lanyard plate is kept slightly open using a suitable small separator The plate should sit with its lugs in the lug recesses Push the plate towards the top of the EPD LCD end ensuring that the retaining lugs engage in position in the clip assembly recess Check that the lanyard plate is locked in position the plate remains in position when the assembly is pushed towards the bottom of the EPD ISSUE 9 Thermo Scientific Page 93 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK MAINTENANCE 6 4 Cleaning 6 4 1 6 4 2 6 4 3 Page 94 The EPD is a sealed unit and has protection against dust and low pressure jets of water from all directions The unit will not withstand prolonged immersion under pressure Cleaning should be carried out if the unit requires general cleaning if the EPD battery has leaked or if the unit has come into contact with radioactive contamination General Cleaning The unit should be cleaned with warm soapy water Use a neutral wate
22. processing disabled Consecutive Drop more than 15 seconds Counts not latched yet no drop occurred Counts Processing time inconsistent Count too large HG or SG gt 300 000 or FB or BC gt 26 000 Reset into comms mode only counts processing disabled Counts processing disabled Detector threshold load failed A calibration value is out of range None continues normal processing Abuse alarm more than 15 consecutive seconds of knocks unit Return to supplier if recurs No oor oaos Used A Pa Y Used ee or interface to ASIC may be faulty The only reason to not latch the counts would be that a knock has occurred ae to supplier Reset unit Return to supplier if recurs Unlikely to occur unless clock overflows This is not possible unless clock is written with new value or incremented at wrong rate This fault can occur by inputting a very large number of counts only possible under test conditions or severe interference Texas chip or associated circuits may be faulty Reset unit Return to supplier if recurs Return to supplier Display will indicate dashes but error code can be extracted from error log An error status bit is also set This fault will be picked up on power up writing cal factors or thresholds or switching from OFF to ON mode Clear with Check knock detector EasyEPD Return to supplier if recurs when unit not
23. shocks This is overcome by detecting the shock with a piezo knock detector The EPD continues to accumulate dose during the shock period but at the dose rate that was present immediately before the knock was detected However if the dose rate is greater than approximately 4mSv h the counts caused by the knock will be small relative to the radiation counts and therefore all counts are used in the calculation of dose Knock Time is the time period over which knock processing has taken place Continuous Knock detection for greater than 15 seconds will cause an abuse alarm see Abuse Warning iii Dose Over range The dose over range flag indicates that one of the dose stores has exceeded 10Sv 1000 rem was 1Sv up to version 14 Dose continues to accumulate above this value to a maximum of 16 777215 Sv 1677 7215 rem ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 4 6 8 TECHNICAL DESCRIPTION iv Dose Rate Over range The dose rate over range flag indicates that the dose rate has exceeded 1Sv h 100 rem h at some time in the past i e the recorded dose may be inaccurate probably low due to non linearity at high dose rates v Counter Over range The counter over range flag indicates that at least one detector has exceeded the maximum count rate expected 300 000 counts second gamma counters and 26 000 counts second beta counters A possible cause for this flag to set is that
24. the button until this Gegen e i i top level display appears am e Three sub displays are available in the following sub display order 1 Hp 10 Dose Alarm 2 Hp 10 Dose Alarm ISSUE 9 Thermo Scientific Page 35 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK OPERATING INSTRUCTIONS Page 36 Hp 0 07 Dose Alarm The EPD can be used as a personal alarming dosemeter with alarm thresholds for accumulated dose alarms This mode displays the current settings for the dose alarm thresholds The alarm threshold can be modified by the user if required but only when the default setting is set to adjustable The user is barred from modifying the threshold if the default is set to not adjustable These default settings can only be set via the IR communications link There are two Hp 10 alarm thresholds and a single Hp 0 07 alarm threshold that can be displayed and modified The 2 Hp 10 dose alarm has the higher priority and should always be set to a higher value than the 1 Hp 10 alarm The accumulated dose alarm thresholds can be set using the button as follows 1 amp 2 Hp 10 Hp 0 07 10uSv 50uSv 100uSv 500uSv 1mSv 5mSv 10mSv 50mSv 100mSv 500mSv 1 0Sv Example of 1 Hp 10 Dose alarm threshold display set at a default me y ho ii value of 500uSv A gt LI Ley Other values for the dose alarm thresholds may be set via the IR communications link Chang
25. the sound output is also given Operation or event Typical mute period Communication over the IrDA link 1 second or more depending upon the application Communications over the Less than a second teledosimetry link Backlight activated from the button Default display timeout typically 10 seconds during which the backlight is on Battery test typically every 15 Less than 1 second minutes ISSUE 9 Thermo Scientific Page 17 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK OPERATING INSTRUCTIONS Alarm Configuration The EPD is able to initiate alarms for a number of different operational conditions The nature of any alarm is shown on the LCD display by an alarm flag see Figure 3 2 or in the case of an over range alarm by a flashing LCD display Faults are shown as a letter F followed by 3 digits There are a number of options that can be set for each alarm for example tone frequency and volume The various options are defined in Tables 3 1 and 3 2 The sounder LED and mute facilities can only be configured via the IR communications link The configurations can be set independently for each alarm event recognised by the EPD see Table 3 3 Note that alarm duration is set in increments of 4 seconds Assuming an alarm is not acknowledged then following this period the alarm is replaced by a single beep every 30 seconds This feature avoids wasting battery power The timeout can be disable
26. twice in quick succession Electrically Erasable Programmable Read Only Memory Electronic Personal Dosemeter EPD Beta Gamma variant EPD Gamma only variant Electron Volt Gray Sl unit of dose Hexadecimal Health Protection Agency in the UK Previously NRPB the statutory authority for radiological protection in the UK EPD LCD nomenclature for personal dose Hp 10 EPD LCD nomenclature for personal dose Hp 0 07 EPD LCD nomenclature for dose rate Hp 10 h EPD LCD nomenclature for dose rate Hp 0 07 h Personal dose equivalent at a depth of 10mm of tissue penetrating deep or whole body dose Personal dose equivalent at a depth of 0 07 mm of tissue superficial shallow or skin dose Hp 10 dose rate Hp 0 07 h Hp 0 07 dose rate ICRU LED International Commission on Radiation Units Identification Infra red Infra red Data Association Kilo Electron Volt Liquid Crystal Display Light Emitting Diode Long PressPressing and holding the button LTC MeV m mm nm Thermo Scientific Lithium Thionyl Chloride Sulphurous Oxychloride SOCI Mega Electron Volt metre milli millimetre nanometre ISSUE 9 Page vii EPD HB 40521 000 GLOSSARY NRPB PCB PTB SDE ppm RAM rem RFI Short press Sv T TLD ELECTRONIC PERSONAL DOSEMETER HANDBOOK GLOSSARY continued National Radiological Protection Board now HPA Printed Circuit Board
27. 0 OPERATING INSTRUCTIONS ELECTRONIC PERSONAL DOSEMETER HANDBOOK Menu Blank First button press illuminates backlight if backlight is enabled Short Button Press selects next display for each menu or lock on Long Button Press selects next menu or Mutes an active alarm or turns an OFF EPD On Lock on available Double Click to activate Hp10 Dose HP10 Hp10 Dose Hp10 Dose User Identity User ID User ID Rate 1 2 3 4 5 6 7 8 9 10 11 12 H10 H10 H10 h gt 4 Hp07 Dose HP07 Hp07 Dose Hp07 Dose ADS UserID ADS User ADS User ID Rate 1 2 3 4 1D 5 6 7 8 9 10 11 12 H 07 H 07 H 07 h y Vv Kl Total Dose tot Total Hp10 Total Hp07 Dose Dose H10 T HO7 T Duration SECS Count down Reset Time Time rSt MM SS Power Saving On OFF Peaks rhi Peak Hp10 Peak Hp07 Dose Rate Dose Rate rate high AM H10 h MA H07 h Tesi tESt Clear Clear Hp10 CLr Hp07 Dose CLr Dose Alarm dAL 17 Hp10 Dose 2 Hp10 Dose Hp07 Dose Thresholds Alarm Alarm Alarm H107 ma gt o 4 ug P Hoz Dose Rate ron 17 Hp10 Dose 2 Hp10 Dose Hp07 Dose Alarm On Rate Alarm ON Rate Alarm ON Rate Alarm Thresholds ON da vunn d unn da Hoz h Dose Rate roF EF 1 Hp10 Dose 2 Hp10 Dose Hp07 Dose Alarm Off Rate Alarm OFF Rate Alarm Rate Alarm Thresholds OFF OFF y V y V H10 h duo mn H 07 h Sound Button Beep Chirp Internal Settings bEEP Enable Disable Adjustment Co
28. 0 Dose Alarm Continuous Single Tone Hp 10 h SE Continuous Single Tone High Loud Rate SC Hp 0 07 h Dose Intermittent Single Fast Tone High Loud Rate Alarm Hp 10 h Dose Intermittent Single Fast Tone High Loud Rate Alarm 1 Return Alarm Intermittent Single Slow Tone Count Down Alarm Continuous Single Tone Abuse Alarm Intermittent Single Slow Tone ac Table 3 3 Default Alarm Tones MA Battery Alarm Intermittent Single Slow Tone KE ISSUE 9 Page 20 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 3 2 2 3 2 3 OPERATING INSTRUCTIONS Dose Alarms Dose alarms are checked and updated every second except at low dose rates where this period increases to a maximum of 14 seconds Alarms can be adjusted or inhibited via the IR communications link Dose alarms are calculated against a preset alarm threshold set in the EPD When the dose equals or exceeds the dose threshold the LED will illuminate the sounder will activate and the appropriate alarm flag on the LCD will be displayed Note that it is dose and not total dose that is compared with the threshold The alarm may be muted by pressing and holding the button unless alarm mute user silence is inhibited The four most significant digits of the alarm thresholds can be viewed on the EPD LCD and changed using the function button see Section 3 5 8 Dose Rate Alarms Dose rate alarms are checked and upda
29. 2Sv h 20 lt 1Sv h EPD BG only ISSUE 9 Page 96 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 APPENDIX A Typical EPD BG Mk2 Energy Response Response 10 100 1000 10000 Photon Energy keV Typical EPD G Mk2 Energy Response Response a Hp 10 cc 0 07 10 100 1000 10000 Photon Energy keV ISSUE 9 Thermo Scientific Page 97 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK APPENDIX A ISSUE 9 Page 98 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 APPENDIX B APPENDIX B ELECTROMAGNETIC COMPATIBILITY Standard Test The EPD was tested to the following specification with no failures Range Susceptibility E Field Radiated Def Stan 59 41 14kHz 18GHz 200V m Susceptibility E Field Radiated Mil 461D RS101 30Hz 100KHz See Chart 1 Note 1 Susceptibility H Field Ec oe 4 2 dee E Field Emissions a oes Radiated Spot e e Ghz See Chart2 Note 2 Susceptibility E Frequencies CW Field High Field Radiated Spot 500MHz 40 Ghz See Chart3 Note 2 Susceptibility E Frequencies Field High Field CW with 1kHz 1 HS Satare wave square wave 1 The limits are as Mil461D Army between 30Hz and 1kHz Between 1kHz and 100kHz the limit is increased by 20 dB 2 The units were tested up to the point of failure or to the maximum field attainable in the test configuration Graphs follow I
30. 82 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 FAULTS AND RECOVERY ACTIONS This page intentionally left blank ISSUE 9 Thermo Scientific Page 83 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK MAINTENANCE 6 1 Page 84 SECTION 6 MAINTENANCE This section describes the maintenance that may be required for the EPD Maintenance is limited to general cleaning removing replacing the EPD battery and removing replacing the EPD clip assembly Limited maintenance can also be carried to clear fault conditions and check the functionality of the EPD Calibration The EPD is calibrated by a highly sophisticated automatic system consisting of several radioactive sources Calibration is performed during manufacture and is expected to remain unchanged throughout the life of the EPD provided the EPD remains undamaged Thermo normal policy is to supply EPDs with the calibration factors locked to prevent their subsequent modification other than by Thermo However where expressly requested by customers in their purchase order EPDs may be supplied with the calibration factors in the unlocked sate This is to enable such customers to modify the calibration of these EPDs In such cases the customers attention is drawn to the following Disclaimer DISCLAIMER The EPDs within this shipment have been calibrated using the factors as defined on the supplied Calibration Certificate As the calibration is NOT LOCK
31. AA RA EA A BO A A ate 44 SECTION da ali 45 Thermo Scientific ISSUE 9 Page iii EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK CONTENTS TECHNICAL DESCRIPTION ENEE 45 4 1 GENERAL eege Ee 45 4 2 ELECTRICAL DESCRIPTION cccecssessesescseeceseseeeeecaescssescsesecaescsacsesececaenesaeaeeeeeeaenenetaeeesees 46 4 2 1 Electrical Characteristics cececescesesesseseseeeeseceseecesesesseceseeceseeeseeceaeeceseeeeeceeaensnaeseeeeees 46 4 2 2 Battery Management 46 4 2 3 On Off Operating Modes ceccececcsssseseseseeseseseeceseseseeccneeceseeeseeceseeeseececeeaeeeeaeeeeeeees 48 4 3 MECHANICAL DEsCbIpTON no nonono nono nn no noncnnnnon anno rarnnnnnon rra ramnnnanos 49 4 3 1 Mechanical Characteristics And Dimensions 49 4 3 2 Brief Mechanical Description 49 4 4 ENVIRONMENTAL DESCRIPTION eccccccsceseseseescecseecsescseecaeseaesceececsenesasaceeceeaenenataeeesees 51 4 4 1 Environmental Charachertetice 51 4 4 2 Brief Environmental Description 51 4 5 INFRA RED INTERFACE 52 4 5 1 Communicating With The EP 52 4 5 2 EPD Configuration via the IR Communications mks cesses esereeeteteeeeees 53 4 6 EPD INTERNAL PROCESSING amp FacmEs cronicas 55 4 6 1 Memory Charachertstice nro 55 4 6 2 Alarm Charachertstce rr cn nora caninas 56 4 6 3 Default Display 56 4 6 4 User entttcaton ceccceccctecscssesseecsceseeseseeseeecsseseesessssesccsseseecsesecseseeseeecseeseeecsaeseeeenes 56 46 5 DOSE ANA Dose Ra
32. CONTAMINATION THE EPD MUST BE SUBJECT TO ALL RELEVANT DECONTAMINATION PROCEDURES LAID DOWN BY THE RADIOLOGICAL PROTECTION AUTHORITY Lithium Thionyl Chloride Batteries LITHIUM THIONYL CHLORIDE LTC BATTERIES ARE POTENTIALLY DANGEROUS THEY MAY LEAK TOXIC SUBSTANCES THAT CAN BE HARMFUL READ AND TAKE NOTE OF THE MANUFACTURERS WARNINGS ON THE BATTERY CASE READ ALSO THE DETAILED LTC BATTERY WARNINGS IN THIS HANDBOOK Sulphurous Oxychloride SOCL2 Cautions EPD batteries Batteries are susceptible to fire and abuse Some manufacturers provide batteries with a safety vent which allows a controlled release of electrolyte if fire and abuse conditions prevail If the EPD has been damaged in a manner that could affect the battery care must be exercised during battery removal The battery may have vented into the EPD case and caused the EPD to become pressurised EPD Battery Cap Take care when removing the EPD battery cap the battery cap may spring free with unexpected force ISSUE 9 Thermo Scientific Page ix 611 HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK WEEE Compliance WEEE Compliance This product is required to comply with the European Union s Waste Electrical amp Electronic Equipment WEEE Directive 2002 96 EC It is marked with the following symbol Thermo Fisher Scientific has contracted with one or more recycling disposal companies in each EU Member State and this product should be disposed of or r
33. D BG amp EPD G Dosemeters SGSens07 EPD BG amp EPD G Dosemeters FBSens07 EPD BG Dosemeter only BCSens07 EPD BG Dosemeter only Where EPDs are provided with calibration in the unlocked state see above it is these six factors which may be adjusted within the defined percentages from the manufacturers original calibration These gain adjustments are made using software facilities available via Thermo Fisher Scientific but should only be considered in consultation with Thermo Detector Thresholds Detector thresholds discriminate between radiation pulses received by the EPDs detectors These thresholds are set as course and fine values measured as Hard Gamma HG EPD BG amp EPD G Dosemeters Soft Gamma SG EPD BG amp EPD G Dosemeters Full Beta FB EPD BG Dosemeter only Beta Compensating BC EPD BG Dosemeter only From software version 11 the detector thresholds were changed to improve the precision and accessible range No facilities are provided to adjust the detector thresholds and these can only be set by the manufacturer EPD calibration may be checked using a Thermo irradiator or by exposure to a known radiation field in a manner approved by the appropriate regulating authority or local rules It is recommended that calibration is checked annually ISSUE 9 Thermo Scientific Page 85 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK MAINTENANCE Page 86 A change in EPD calibration is usual
34. D default display is preset at the factory to show Hp 10 the penetrating or deep dose or to another default display as specified by the customer If a fault code is displayed or the start up sequence repeats try a fresh battery If problems persist refer to section 5 EPD Confidence Test The EPD has a built in confidence test facility This runs automatically at startup following battery change When enabled this test can also be run at any time during operational use as a check that the EPD is functioning correctly The confidence test is selected by scrolling through the EPD LCD displays to the CONFIDENCE TEST menu see Section 3 5 7 Throughout the confidence test the heart beat activity indicator flashes once per second The confidence test can be stopped at any time by pressing the button The confidence test sequence is as follows This test sequence is automatic and should be visually confirmed as each step initiated 1 All segments of the display are activated This allows the user to check that all segments are functional see Figure 3 2 2 The alarm will sound and the LED will flas This indicates that the sounder and LED are functional 3 The all segment display will disappear The alarm will continue to sound and the LED will continue to flash at an increased rate This indicates that all LCD segments can be turned off and that the tone frequencies are functional 4 The all segment display will reappear and t
35. DOSEMETER HANDBOOK EPD HB 40521 000 3 5 8 3 5 9 OPERATING INSTRUCTIONS 4 The all segment display will reappear for approximately 5 seconds and the LED will slow flash 5 The all segment display will disappear and the default display will appear This indicates that the confidence test has been successfully completed and that the EPD is ready for operational use Upon completion of the confidence test the unit reverts to the default display If the confidence test is unsuccessful a letter F followed by three digits is displayed Note the failure codes and refer to Section 5 Failure Modes and Fault Diagnosis Clearing Dose Displays To clear dose displays press wi i and hold the button until this top ao level display appears a Tes Only one sub display is available Clr This mode is used to clear the Hp 10 and Hp 0 07 doses Note The total doses are not cleared Press the button once to select the display shown opposite DD A LLIF Double press the button again and the display will flash Double press the button again to confirm the request The display will change to 0000 and return to the default display The Hp 10 and Hp 0 07 doses have now been cleared DoseOnAlarm Responder configured EPDs stop accumulating dose when the Dose is cleared Displaying Setting Dose Alarm Thresholds To display and or set dose alarm thresholds press and RW H10 ii hold
36. Dosemeter but without the Beta measurement capability Both Dosemeters provide an estimate of the radiation dose that a person wearing the EPD has received Radiation that is detected by the EPD is processed to give an indication of penetrating dose superficial dose and the dose rates This information is displayed to the user via an LCD display on the top of the EPD The EPD BG contains three silicon diode detectors Each detector feeds a chain of dedicated amplifiers and counter circuits to measure soft gamma hard gamma and beta radiation In the case of the EPD G the beta detector and associated counter circuits are omitted The outputs from each detector chain are processed to calculate and display penetrating Hp 10 and superficial Hp 0 07 dose and dose rates The EPD BG and EPD G Hp 10 and Hp 0 07 responses to gamma radiation are very similar however the EPD BG Hp 0 07 response includes a Beta contribution ISSUE 9 Thermo Scientific Page 1 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK INTRODUCTION Page 2 Other functions provided in EPD BG and EPD G Dosemeters include EEPROM storage of detected radiation annunciation of alarm conditions LED and sounder Infra red IR communication and a user interface comprising an LCD display and button Each of the above functions is described in detail in this handbook The Thermo Fisher Scientific EPDs have a rich feature set which can be configured to the users re
37. ED Thermo has no control over any subsequent adjustments made by the end user to these factors Thermo can therefore not warrant the calibration of these EPDs once they have left the factory As such Thermo accepts no liability for the accuracy of the radiological response of these EPDs EPD calibration may be checked using a Thermo irradiator or by exposure to a known radiation field in a manner approved by the appropriate regulating authority or local rules It is recommended that calibration is checked annually ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 MAINTENANCE A change in EPD calibration is usually indicative of a fault in the EPD and due to the complexity of achieving calibration over the full energy range it is recommended that any EPDs that fail calibration checks are returned to Thermo for repair recalibration or replacement During calibration the calibration constants and the threshold levels for each of the four channels are set The threshold levels determine the minimum pulse size that will be considered a count The calibration constants ensure that the channels are combined in the correct fashion to give correct dose readings Calibration Constants Calibration constants convert the counts accumulated on the four detector channels into dose equivalents These constants are HGSens10 EPD BG amp EPD G Dosemeters SGSens10 EPD BG amp EPD G Dosemeters HGSens07 EP
38. ING INSTRUCTIONS LCD Display Lock on Facility Any new display selected using the button remains visible for a set period of time Thermo default time out is 10 seconds before returning to the default display Some display selections marked in Figure 3 4 can be locked on i e the return to the default display is suspended This facility is especially useful when displaying dose rate or when using the count down alarm If a lock on facility is available it must be accepted quickly when a colon appears just before the selected display times out The colon will only appear for approximately two seconds To accept the lock on facility press the button when the colon appears If the lock on facility is not required allow the selected display to time out To deselect the lock on facility press the button The display will move on to the next display selection but will thereafter revert to the default display after time out The seconds count down timer and time to alarm lock on facility operates in a slightly different manner to that described above In this instance the lock on facility is available when the colon disappears This only occurs for these two displays and again is just before the display times out To accept the lock on facility press the button when the colon disappears If the lock on facility is not required allow the selected display to time out ISSUE 9 Thermo Scientific Page 25 EPD HB 40521 00
39. LE AND VISIBLE ALARMS cccccccccssessescsseseesesseseescssesesecsessesecsesseseesenseeecsesseeeenee 17 IAT Alarm features sicc ccs AS 17 Ge OSC ANAIS ee se ee ares ee A cote tees 22 3 2 3 Dose Rate Ailamms eececccccccccccceseeseeseeseeseeseeseceseecuseesesaecsessecaessecasensesaecsessecseeeceaeeeeeaeenes 22 3 2 4 Over Range INGICALION ee ee eceseseseseeseseseseseseseesenesesseseseceenenesaeseseeseseneeaeseseeeeaenenaeaeeeees 23 I2 AAA MUN EE 24 3 3 BUTTON OPERATION AND DISPLAY SELECTION cecececesceceseeeseeceeeeestseeeeeeaeeeeeteeeesees 25 3 4 LCD DISPLAY LOCK ON Face 26 3 5 1 Displaying Hp 10 Dose Dose Rate and User ID 29 3 5 2 Displaying Hp 0 07 Doses Dose Rate and ADS User ID 30 3 5 4 Starting Stopping The Seconds Count DOWN Tmer 32 3 8 5 EPP ON OFF conti Ge A 34 3 5 6 Displaying Peaks Rate Hoh 34 3 5 7 EPD ConlidenCe TOS ina 35 3 5 8 Clearing Dose Displays cccesecesessesesesseseseseeseceneecseseseeccnesceaeseseceeseeceaeaceceeaeeetaeeesesees 36 3 5 9 Displaying Setting Dose Alarm ThresholdS csccceccsssceseseesecenseseseeeeseeeneeeeaeeeeeeees 36 3 5 10 Displaying Setting Dose Rate Alarm On Off ThresholaS o cooocconcoomoso 38 3 5 11 Setting The SOUL ccececcsceseseseesesesenseceseseeseceseecsaescsececnescaeseeececseneeseseseeeeaeanataees 40 3 5 12 Enable Dose Accumulaton no e no nonn corno norris 43 33 13 D ttery VOB Ad Ai dado 43 SF DELANO 1G OLA dt Ee
40. METER HANDBOOK EPD HB 40521 000 FAULTS AND RECOVERY ACTIONS Faulty LED Hardware fault Contact supplier No visual alarm during Confidence Test LED fails to operate in LED Disabled Enable LED if required alarm condition Faulty Display Hardware fault Confirm fault by running a Missing or additional CONFIDENCE TEST segments on LCD display Contact supplier Table 5 1 Blank LCD amp other faults ISSUE 9 Thermo Scientific Page 73 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK FAULTS AND RECOVERY ACTIONS 5 5 5 6 Page 74 Initialisation Error LCD A series of single dashes appearing on the LCD display indicates an initialisation error following a reset or battery change Initialisation errors typically refer to corruptions to data in the EPD s non volatile memory EEPROM These are faults the user cannot usually repair Follow the procedures defined in section 8 to extract data and to recover normal operation where possible Communications Error LCD A series of triple dashes appearing on the LCD display indicates a communications error This condition usually occurs when a data write operation fails to complete The typical cause is that the EPD unit is removed from the IR field before a critical write operation has completed for example an Issue of the EPD to a person The error which is accompanied by an audible alarm alerts the user that the EPD is not in a valid op
41. ONS 5 7 Page 76 LCD Display Error Codes Faults that exhibit a known condition are normally indicated on the EPD LCD as F followed by a 3 digit error The error code number is also logged in the Event History store with date time data As an example the following shows fault F095 A list of EPD error codes is given in Table 5 2 They are divided into blocks according to the software module that generates them Epd Action This describes what the EPD does in addition to attempting to display the fault and record the fault in the event history store ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 5 8 5 8 1 5 8 2 FAULTS AND RECOVERY ACTIONS Recovery Procedures Logging Faults Extracting Data All faults other than the communications error described in section 5 6 should be logged using the standard Form in the Appendices This form may be used to log single or multiple faults The completed form should be copied to the supplier of the EPD Thermo or other supplier Distributor If the unit is in operational use it is recommended that as much fault and operational data as possible is extracted from the unit via the LCD and using EasyEPD2 The extent that this is possible will depend upon the nature of the fault Note that for many faults button display operation and IR communications are unaffected This includes many Fxxx codes displayed on the LCD Data should be extrac
42. PDs prior to software version 11 If a 1 5V Alkaline battery is installed the EPD automatically switches in a step up converter to maintain the 3 6V operating voltage The step up converter is also switched in as the LTC battery runs down However the EPD will not start up if it is fitted with a LTC battery that has been discharged sufficiently to require the step up converter to operate Operationally as the voltage from either battery type falls a series of preset voltage thresholds operate as follows i The internal step up converter is switched in to maintain the voltage at the EPD s operating level ii As the battery voltage under load continues to fall the low battery alarm flag is activated to indicate when a minimum of 10 hours battery life is remaining Different thresholds are automatically selected for LTC or alkaline batteries iii As the battery voltage under load finally falls below tolerance the EPD resets blank display In some cases the EPD may reset repeatedly giving rise to a quiet ticking sound The EPD battery must be replaced EPDs from software version 11 onwards These EPDs have the step up converter permanently activated to maintain the required circuit operating voltage as either the Lithium or the Alkaline battery voltage falls The EPD makes the following information available over the IR comms link e Type of battery currently fitted Low volts Alkaline or high voltage Lithium Thionyl Chlori
43. RTE el EE 55 DIMENSIONS a a hn oe a eae ehh e a es Ah toe ae et ah Be 4 48 Display ana tae a a er e a e epee eee 16 Display Lock on Facility no nonncn no nonnco Er E OA 25 Display de es 27 ADS User ID aa iaa 29 Count DOWi Tamer sss os need coisa owen agas 31 Counters EE ON 41 Hp C1 0 Dose Dose Rate ii A ee eeh Zeg 28 Hp 0 07 Doses Dose Rater steig ege dave g ss svete e ESO leashes DEER geed 29 ISSUE 9 Thermo Scientific Page 113 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK Index Peak Dose Rates 0 cccceccccccessssscscccccccessscsccsccccesssssessecescesssesceseccssesssscssscseseussescossceeseuencssecsssessuenesess 33 Total NEE EE EE 31 DEE EG 28 Dose Alarm ThresholdS oooccocccococinonoconocinonononocinonocono cono nocono conoce cono nono nccnnnncnn ne cono c cnn R T 35 Dose E EE 21 Dose Chirp AGJUSIMENt scsi 40 Dose QUAY ooo A e Ee edel edd 58 Dos Rate oi A As ces a A E AA adas 56 Dose Rate Alarms ici A el OR ee a 21 Wetter pe ea E fra E A EE I E 63 let ee LE sst d 84 cia tet Ad dia Ae ate etd ed eR Anos vii 3 35 42 E PEP LEE 5 EEPROM Storage EE 2 electrolyte e E 89 Environmental CharacteristiCS oooocconnncocococinonoconocononocono cono nocono cono nocnnnccnnnoconn nono no cono connnccnnnccnnnccnns 50 Event History tores italiana 64 F Balt Codes aa 78 ES Ei 68 G Gamma radiation NN 5 General maintenance cee eee eee ceeececesccesececesscesscecscceeseeceascesseecesscees
44. Response This is an EPD Software version 14 and above which is FACTORY configured such that it responds to certain pulsed dose rate fields See section 4 6 12 for further details ISSUE 9 Thermo Scientific Page 3 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK INTRODUCTION 1 2 EPD Major Characteristics Major Characteristics relating to the EPD are listed in Table 1 1 Table 1 1 EPD Major Characteristics Power One AA battery either a standard Alkaline 1 5 V battery or high energy Lithium Thionyl Chloride LTC 3 6 V Weight 95 gms including LTC battery and clip 86 x 62 x 18 5 mm excluding clip Alarm sounder 98 101 dB on loud 4kHz setting Quiet and 2 kHz settings available Dose chirp function on Hp 10 dose The EPD also has the following major features High immunity to radio frequency interference RFI Display Backlight EPD communication via an infra red interface up to a range of approximately 1 metre Powerful and flexible dose profile facility Real time chirp on gamma dose sensitivity adjustable Password protected dose store for ADS functions Extended systems integration facilities Count down timer and alarm Appendix C is a summary of the general physical amp functional characteristics of the EPD ISSUE 9 Page 4 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 1 3 INTRODUCTION Brief Functional Description
45. S To change the chirp rate double press the button at current dose py W OT chirp display The display digits will Gegen e 0 flash ES INN Sv Dose Chirp Limits 0 01uSv to 100uSv Note 0 Off no chirp function Pressing the button will increase the dose per chirp in the following increments 0 0uSv 0 01uSv 0 05uSv 0 tuSv 0 5uSv 1 0uSv 5uSv 10uSv 50uSv 100uSv When the required sensitivity is reached double pressing the button will confirm the value and the flashing display will stop If you start to change the sensitivity and change your mind the option can be aborted Short press the Fee button until the following is displayed Ma letters flashing Double press the button to confirm you want to return to the previous chirp sensitivity To switch off the dose chirp double press the button when 0 0 uSv is displayed If the ESC screen is displayed and the button is not pressed after default time out the display will return to dose chirp adjustment display Again if the button is not pressed the display will return to the top level default screen after a further time out period Internal Counters Display Short press the button to display the a gt d current internal counters display Gegen ee y OS e e AL The display is in hexadecimal format and shows the last digit of hard gamma HG soft gamma SG full beta FB and beta compensation BC co
46. S EPD HB 40521 000 HB40521_000_ Iss9 ISSUE 9 Thermo Scientific Page i ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 CONTENTS Page GLOSSARY E Vil GLOSSARY CONTINUED wii citiscccicscccecdicucaceinstacsectianscicdinncascteaeces ottanscisdiendaectuassciasibadsedtavendee Vill CAUTIONS ficient ete eae dee IX WEEE COMPLIANCE Wi scccecsecccetcetsccsvcsecececevenctvesseccceecunceusvesscecsdevescueesvaccurvesveceavdvveacueevveccuverveceuvs xX SECTION ebe 1 INTRODUCTION BEE 1 1 1 GENERA Leese O Ee 1 1 1 1 Manufacturer Contieurations nn nono nono nena aran nnnn nn n anne crec nori ne cn ncon aceros 2 1 2 EPD MAJOR CHARACTERISTICS cccccccssessescssesescscesesscsessesecssssesecsessesecaseseeeesesseeeeseeaeeees 5 1 3 BRIEF FUNCTIONAL DESChRipTON ninos 6 SECTION Zi a adas 8 GETTING STARTED euer 8 2 1 SETTING UP id 8 2 1 1 Unpacking The EPD eueeet in ieran e EEE EAE AEEA EAR EAE 9 21 2 The EPDBallOlY cccioononcionnionnicosconinoinonisnnsnonndno ion ii iE 9 2 1 3 Start up SequenCe 00 ceceseccecesesessesesesesseseseseeseseessaeseseccenesssaesessceeaeeceaeseseceeneeetaeseeeeeeneees 12 2 1 4 EPD GONnTIOCNCE ToS nocie raaa a 13 ZTS ISSUING AN EF D inni a AE E dn EEA E 14 Z0 Wearmg an RE 14 SECTION E DE 16 OPERATING INSTRUCTIONS cccccesseeceeesseeeeeeseeeeeensneeseeensneesesennaeseeesnaeseensnaeseeensaeseeeenes 16 3 1 LCD DISPLAY AND BACKULIGHT canon cnn co non nnn co ron cnn cn nancinnnns 16 3 2 AUDIB
47. SSUE 9 Thermo Scientific Page 99 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK APPENDIX B Chart 1 Amps Metre 1000 100000 Frequency Hz Chart 1 The tested Mk2 EPDs were not susceptible to H field radiation below the above graph Chart 2 o E o a o gt 100 100000 Frequency MHz Chart 2 The tested Mk2 EPDs were not susceptible to E field radiation below the above spot frequencies 100kHz 100GHZ carrier wave ISSUE 9 Page 100 Thermo Scientific EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK APPENDIX B Chart 3 o o Ei o gt Frequency GHz Chart 3 The tested Mk2 EPDs were not susceptible to E field radiation below the above spot frequencies 0 1GHz 100GHz pulsed 1kHz 1uS ISSUE 9 Page 101 Thermo Scientific EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK APPENDIX B This page is intentionally blank ISSUE 9 Page 102 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 APPENDIX C APPENDIX C SUMMARY OF GENERAL PHYSICAL amp FUNCTIONAL CHARACTERISTICS Battery Mechanical Type Dimensions Typical Life Test On Off control Access Output Alarms Configuration per ala
48. The Physikalisch Technische Bundesanstalt Braunschweig and Berlin The national institute of natural and engineering sciences and the highest technical authority for metrology and physical safety engineering of the Federal Republic of Germany Shallow Dose Equivalent alternative nomenclature for Hp 0 07 Parts per million Random Access Memory A unit of dose equivalent equal to 10mSv Radio Frequency Interference A short press and release of the button Sievert Sl unit of dose equivalent Tesla Thermoluminescent Dosemeter Total Dose Intended to be a secure record of the total accumulated dose received since User ID User Name Wearer ID Wearer Name WEEE Page viii Dosemeter issue alarms do not apply to total dose A numeric code of up to 12 digits that may be written to the EPD to define the current user or wearer By convention a value of FFFFFFFFFFFF is written to EPDs not currently issued to a wearer A character string of up to 22 characters that may be written to the EPD and used as a second or supplementary Wearer Identity Supplementary to user ID Alternative terminology for the User ID Alternative terminology for the User Name Waste Electrical and Electronic Equipment EU Directive ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 WARNINGS AND CAUTIONS WARNINGS Radioactive Contamination DURING OPERATIONAL USE THE EPD MAY BECOME EXPOSED TO RADIOACTIVE
49. arameter D A GE is used for tactical dose monitoring Sv e g per task etc Display Range OuSv to gt 16Sv auto ranging Note Over range gt 10 0 Sv is indicated with a flashing LCD display see section 3 2 4 Hp 10 h Dose Rate Display Short press the button again to display the current Hp 10 h dose rate Only the first two significant gege figures of the dose rate are displayed L the actual reading is rounded down Display Range OuSv h to gt 4Sv h auto ranging Note Over range gt 1 0 Sv h is indicated with a flashing LCD display see section 3 2 4 This condition is latched to warn the user that the dose value may be inaccurate ISSUE 9 Page 28 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 OPERATING INSTRUCTIONS User ID Digits Short press the button again to display the user identity number User ID This is a 12 digit number that is shown on three separate displays the High 4 digits the Middle 4 digits and the Low 4 digits Short press the button to display each of the remaining User ID digit displays The User ID cannot be changed using the button By convention a non issued EPD is given a User ID FFFFFFFFFFFF Typically a User ID will have fewer than 12 digits but it must be an integer between 1 and 999999999999 For example a User ID 9012 will be shown on the LCD display as follows First Display Second Display Third Dis
50. articles to pass through the case to the Beta detector EPD BG unit only LCD Display Displays EPD parameters and or functionality as selected by the button Alarm LED Provides a visual indication of an EPD alarm Clip Assembly Provides a means of attaching the EPD to clothing or for attaching a lanyard as an alternative means of wearing the EPD Table 2 1 EPD External Features Unpacking The EPD There are no special unpacking instructions Depending on customer requirements the EPD may or may not be shipped with a battery and or a clip assembly Alternatively the EPD may be shipped with just a lanyard plate and lanyard see Section 6 3 The battery if supplied may be a LTC or Alkaline type The EPD Battery WARNING LITHIUM THIONYL CHLORIDE LTC BATTERIES ARE POTENTIALLY DANGEROUS THEY MAY LEAK TOXIC SUBSTANCES THAT CAN BE HARMFUL READ AND TAKE NOTE OF THE MANUFACTURER S WARNINGS ON THE BATTERY CASE READ ALSO THE DETAILED LTC BATTERY WARNINGS ON PAGE 6 2 OF THIS HANDBOOK Sulphurous Oxychloride SOCI ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 GETTING STARTED General Precautions and Instructions Always fit new undamaged batteries of the correct type see section 6 2 A time interval of at least 10 seconds must elapse between removal and replacement of the EPD battery this allows the internal circuits of the EPD to power down The EPD is fitted with ei
51. ays are available in the following sub display order Hp 10 Total Dose Hp 0 07 Total Dose Hp 10 Total Dose Short press the button to display et st un H the total Hp 10 dose gt e d La al SV Display Range Hp 10 OuSv to gt 16Sv auto ranging Hp 0 07 Total Dose Short press the button again to y S display the total Hp 0 07 dose a H Y o L LI JSv Display Range Hp 0 07 OuSvto gt 16Sv auto ranging Each display represents a record of the total dose received by the EPD over multiple tasks e g per day per week etc Starting Stopping The Seconds Count Down Timer To start stop the seconds count H down timer press and hold the EU button until this top level display DC a appears gsi er Two sub displays are available in the following sub display order Count down Time MM SS ISSUE 9 Thermo Scientific Page 31 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK OPERATING INSTRUCTIONS Page 32 Reset rSt The count down timer is a useful facility for activities where actions need to be completed within known time periods The User may start stop and reset the count down timer using the button When the timer expires the appropriate alarm is sounded The count down time period is pre set and can only be adjusted via the IR communications link Count Down Time Short press the button to display the Count Down Time which indica
52. button The display will change to OFF flashing Double press the button again to confirm the request The display will change to the word OFF not flashing confirming that the unit is in OFF mode and not measuring radiation To return to operating mode press and hold the button The display will revert to the default display For units configured as Clearonon please see sections 1 1 and 4 6 12 Note ON OFF control via the button may be inhibited by the appropriate setting of the EPD internal configuration via the IR communications link Displaying Peaks Rate High To display peaks high rate press and hold the button until d this top level display appears Gegen Two sub displays are available in the following sub display order Peak Hp 10 h Dose Rate Peak Hp 0 07 h Dose Rate These displays show the highest dose rate that the EPD has measured since the peaks were last cleared The peak dose rates measured are recorded for penetrating and superficial dose rates together with the times at which these rates occurred to a resolution of 1 second ISSUE 9 Page 33 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK OPERATING INSTRUCTIONS 3 5 7 Page 34 Peak Hp 10 h Dose Rate Short press the button to display the er pt um H Peak Hp 10 h Dose Rate A A e A al L LI ysv h Peak Hp 0 07 h Dose Rate Short press the button again to E w Eu DT display P
53. cial tool or coin as appropriate and align the battery cap tangs with the recesses in the EPD body Push the battery cap into the battery compartment opening ensuring that a the body of the battery cap which houses the electrode contact plate is fully engaged within the battery compartment b the cap sits flush with the body of the EPD Do not attempt to rotate the cap until it is fully pressed in and flush with the body of the EPD vi Using the special tool or coin as required maintain steady inward pressure on the battery cap against its compression spring and rotate the battery cap in a clockwise direction through approximately 85 to its end stop Rotate the cap slowly to the point where the resistance of the end stop is felt Avoid use of excessive force 2 1 3 Start up Sequence When a battery is inserted into the EPD fitment of the battery cap will automatically initiate the start up sequence The start up sequence is as follows 1 8888 is shown on the display for approximately three seconds 2 internal software initialisation which checks the state of the EPD such as the internal bus internal memory each detector amplifier and counter chain etc ISSUE 9 Thermo Scientific Page 11 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK GETTING STARTED Page 12 3 confidence test sequence see section 2 1 4 below If the confidence tests pass the EPD default display will appear The EP
54. crement it has received assuming it was all received in the previous second The EPD takes a dose sample in the succeeding second Rate Alarm The Hp10 2 rate alarm operation is modified when the EPD is operating in Pulsed Rate Mode The Hp10 Rate Alarm 2 will occur when the rate alarm on threshold is reached as normal When the dose rate goes below the off threshold then the alarm sound led will continue until User Acknowledged or timed out The Hp h display icon will extinguish but the whole display will flash over range This over range condition ISSUE9 Thermo Scientific Page 65 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK TECHNICAL DESCRIPTION can only be cleared by clearing the Latched Alarm Status This can be achieved via comms or by ClearOnON Off to On transition if the EPD is so configured ISSUE 9 Page 66 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 TECHNICAL DESCRIPTION This page intentionally blank ISSUE9 Thermo Scientific Page 67 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK FAULTS AND RECOVERY ACTIONS 5 1 5 2 Page 68 SECTION 5 EPD FAULTS and RECOVERY ACTIONS Overview This section identifies the fault conditions that can occur and describes the recovery procedure if any to be taken to restore the EPD to operational use The section is organised as follows Fault indication via sounder alarm Led LCD Internal logging of fault condit
55. d ISSUE 9 Page 105 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK APPENDIX C on the EPD LCD in place of the wearer ID see section 3 5 1 The character representation on a seven segment display is necessarily limited see table below Controls Various controls are possible over the communications interface to configure displays sounder operation detector and self test clear dose and detector counts analyse and clear faults set alarm thresholds and alarm characteristics turn the EPD On or Off enable and disable controls via the button adjust the dose profile and special store operation Scratch Pad A large scratch pad is available in the non volatile store to support various system applications This is especially useful for non networked reader stations and can be used to store wearer access data interim dose readings worker access permissions etc Teledosimetry Virtually all data accesses and transfers available over the normal IR link are also available over the teledosimetry interface Operational During critical data writes e g issues and returns issues the EPD can be triggered to alarm if the worker removes the EPD from the IR media before the communication completes In this case the sounder is activated and shown on the display System software can activate the sounder and alarm LED to communicate normal completion short beep and flash or failure long sound and alarm LED ISSUE
56. d 5 2 The store comprises a circular buffer the latest event over writing the oldest Note The date time data field wraps round after 194 days of operation After this time previous event associated day date s cannot be considered as accurate In addition elapsed time during loss of power is not recorded ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 FAULTS AND RECOVERY ACTIONS 5 3 3 Dose Quality Factors A number of faults and events are counted and recorded in association with the measured dose They are zeroed when the dose is zeroed and are subsequently read with the dose These are referred to as the dose quality factors and are described in section 4 6 7 Non zero dose quality factors imply that there may be an error in the dose reading due to the way the product has been used rather than due to a fault within the unit For example the battery cap may have been used or a passivated battery fitted causing a reset and potentially lost dose ISSUE 9 Thermo Scientific Page 71 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK FAULTS AND RECOVERY ACTIONS 5 4 Blank LCD Display and Other Faults It may also be possible for the EPD to fail without producing or displaying an error code or causing an alarm for example due to failure of the micro controller or digital circuit A list of such faults and the recommended course of action is given in the table below Symptom Lik
57. d if desired and the alarm output is not then so curtailed Alarm Feature Configuration Alarm Sound Enabled Disabled Enabled Disabled High Low frequency User Silence Enabled Disabled Mute Alarm Sound Options table 3 2 Duration Continuous 0 or up to 17 minutes Options Off Continuous Single Tone Continuous Dual Tone Slow Continuous Dual Tone Fast Intermittent Single Tone Slow Intermittent Single Tone Fast Intermittent Double Beep Slow Intermittent Double Beep Fast Table 3 1 Alarm Configuration Options Table 3 2 Alarm Sounds Page 18 Note High Frequency 4 kHz approximately Low Frequency 2 kHz approximately To obtain the loudest alarm output it is necessary to configure the alarm to Loud and High frequency ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 OPERATING INSTRUCTIONS The different alarm events identified by the EPD are listed in Table 3 3 This table also shows the default alarm configurations set by Thermo at manufacture The following alarms are regenerated after a reset e g battery change e Over Range Alarm e Dose Alarms e Return Alarm e Battery Alarm after 1 minute e Dose Rate Alarm if the condition persists Alarm Priorities It is possible for more than one alarm condition to prevail at any one time In this event the sounder output is determined by the highest priority prevailing alarm Alarms are prioritised as
58. de e The current battery voltage measured at the last battery load test normally every 15 minutes e The current regulated circuit voltage measured within the last 14 seconds e The battery voltage threshold at which the battery low warning is raised for low voltage Alkaline battery e The battery voltage threshold at which the battery low warning is raised for high voltage Lithium battery These thresholds should not normally require adjustment and any adjustment considered should first be agreed with Thermo Fisher Scientific The battery low alarm and LCD segment are activated when the battery voltage falls below the appropriate battery low threshold The EPD will continue to run normally thereafter for a period of at least 10 hours though this may be shortened by continuous audible alarm output When the EPD is no longer able to continue ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 4 2 3 TECHNICAL DESCRIPTION correct processing it enters a hardware reset state in which intermittent audible alarms are output until such time as the battery nears complete discharge state This may continue for several minutes or longer As the sound is initiated by the hardware it cannot be muted by pressing the button but only by removing the battery Additional information and warnings relating to the EPD battery are given in Section 6 2 On Off Operating Modes The EPD has an ON OFF powe
59. defined in Table 3 3 Priority 1 being the highest priority An active alarm can be superseded by the following events e A higher priority alarm is activated the new alarm starts e The user mutes alarms with a long button press all mute able alarms are muted e Alarms are cleared via the communications links e Aself cancelling condition de activates the alarm e g falling dose rate Care should be taken if the alarm configurations are altered from the defaults set by Thermo and the following points should be noted 1 The alarm priorities are fixed and cannot be altered by the user 2 If the Alarm Type is OFF or both LED and Sounder are disabled then the alarm type is effectively removed from the list 3 If the LED or sounder only is disabled then the LED or sounder output for an active lower priority alarm will be masked not output 4 A short duration high priority alarm can curtail the output of a long duration low priority alarm In general therefore the higher priority alarms should not be configured with either a short duration or with LED or sounder disabled unless the lower priority alarms are also configured this way ISSUE 9 Thermo Scientific Page 19 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK OPERATING INSTRUCTIONS EPD Failure Alarm Intermittent Single Slow Tone F Hp 10 Dose Alarm Continuous Single Tone Hp 0 07 Dose Continuous Single Tone High Loud Alarm Ze 1
60. displayed by EPD Recommended Remarks EasyEPD2 Action Customer Action ll 010 Control Module Error Comms Reset unit Return More than 2 consecutive Critical only to supplier if recurs resets Cause of reset to be identified 011 ditto S W processing fault possibly Watchdog Timed Out micro controller fault Control Module CRC Return to supplier Supplier to re initialise EPD Failure EEPROM and re calibrate Control Module RAM Reset unit Return Only runs from self test Failure to supplier if recurs typically every 15 minutes Other problems may well occur before this time Control Module Stack ditto Only runs from self test Overflow typically every 15 minutes Other problems may well occur before this time Control Module Asic Return to supplier This test performs a read write Fault test on the digital ASIC Unrecoverable other knock on errors may occur Replace ASIC Control Module Return to supplier if Texas chip has flagged bat low Unexpected Battery i occurs regularly or has reset and Power Low converter is off and no reset See Note 1 below Note 1 This fault can occur when the battery cap is fitted if intermittent contact occurs In this event remove the battery cap wait at least 10 seconds then fit the battery cap again Comms Module Text as displayed by EPD Recommended Remarks Code EasyEPD2 Action Customer Action PS E EE e Comms Module Error Reserved for future
61. dware build EPD BG or EPD G Calibration Factors Locked Unlocked Some customers require EPDs to be configured such that their calibration factors can be changed by the customer EPDs are normally supplied Locked and can only be unlocked by the manufacturer DoseOnAlarm Responder EPD This is an EPD Software version 12 and above which is FACTORY configured such that it only starts accumulating dose when a Dose Rate Alarm has occurred or when specifically instructed to via IR command or via the EPD button from the Enable Dose Accumulation display In the context of this Responder feature dose refers to a particular field and display within the EPD Therefore it should be carefully noted that total dose and counts continue to accumulate as normal even during periods when the dose accumulation stops When the EPD is NOT accumulating dose a vertical bar to the top right corner of the EPD display is visible This bar is extinguished whilst the EPD is accumulating dose Once such an EPD starts accumulating dose it continues to do so even if the dose rate alarm has ceased until a doses clear command is received either via IR command or via the EPD button from the Clear Dose Accumulation display Dose Profile does not accumulate whilst this EPD is not accumulating dose To make the DoseOnAlarm Responder EPD stop accumulating dose send a Dose Clear command All other features remain as per a standard EPD BG or EPD G unit Pulsed Rate
62. e IR communications link 4 6 1 Memory Characteristics Memory Retention Dose Profile History Dose Store short term Total Dose Store Event Log ADS Dose Store Peak Dose Rates Storage Times Alarm Flags Timer Return for Read Page 54 10 year data retention Settable interval from two seconds to 35 hours Stores transitions of Hp 10 and Hp 0 07 at a resolution of 1uSv Store for up to 579 records for transitions up to 127 uSv or less Hp 10 and Hp 0 07 Can be reset after each controlled area entry day month etc by health physics staff or dose management system according to local procedures Separate total dose store 23 entries for time recording of alarms etc for incident assessments Approved Dosimetry Service Record of Dose dose memory area with password protection Peak dose rates with time of occurrence 1 second resolution Various alarm and fault flags Count down timer configurable up to 1 hour 39 minutes and 59 seconds 1 second resolution Programmable warning ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 4 6 2 4 6 3 4 6 4 TECHNICAL DESCRIPTION Alarm Characteristics Alarms 2 each Hp 10 dose and dose rate alarms 1 each Hp 0 07 dose and dose rate alarms Dose and Dose Rate Alarms OuSv to 16Sv and OuSv h to 16uSv h resolution V 1 64uSv and 1uSv h Recommended minimum settings to avoid false alarm 7uS
63. e for most conditions that can reasonably be expected in industrial environments The radiological features of the EPD are summarised below a full radiological specification is given in Appendix A to this handbook Sensitivity to X and y radiation EPD BG and EPD G Dosemeters Sensitivity to B particles EPD BG Dosemeter only Multiple PIN diode detectors multiple channel parametric algorithm processing Direct readout of personal dose equivalents Hp 10 penetrating deep whole body and Hp 0 07 superficial shallow skin Neutron response lt 2 Meets relevant parts of BS EN ISO61526 for dose equivalent monitors unless otherwise specified Dose display and storage OuSv to gt 16Sv 0 0 mrem to gt 1600 rem auto ranging Resolution for dose display 1uSv 0 1mrem at levels up to 10mSv 1 rem Resolution for dose storage 1 64uSv Dose rate display OuSv h to gt 4Sv h auto ranging resolution 2 most significant digits or 1uSv h at lower levels 10uSv h for Hp 0 07 h Dose rate peak store OuSv h to gt 4Sv h resolution 1uSv h ISSUE 9 Page 44 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 TECHNICAL DESCRIPTION 4 2 Electrical Description 4 2 1 Electrical Characteristics Power Supply Confidence Test Detector Test Battery Test Alarm sounder 4 2 2 Battery Management One AA Lithium Thionyl Chloride LTC battery 3 6 V giving typically 5 months cont
64. e under PTB approval are specially configured by the manufacturer to ensure certain functions cannot be enabled as follows Alarm Configuration Alarms cannot be configured Off be disabled set to quiet or low frequency This ensures that Alarm sound level is gt 85dB A at 30cm from the EPD The alarm times cannot be set to less than 10 minutes The following Alarm Control settings may also not be changed from the factory configuration Battery alarm level 1 Battery Alarm Level 2 Battery Type Discriminator Regulated voltage alarm level LCD Decimal Point position and display units PTB EPDs are configured such that the settings for decimal places dose units off display wearer display overrange flashing and 1 minute logging cannot be changed EPDs are factory configured to the required Display Settings and then locked in that condition This configuration is required for PTB approved EPDs Calibration Factors Beta Gamma EPDs are supplied with calibration factors locked Any attempt to configure PTB Approved EPDs contrary to this specification will fail If the configuration is attempted using EasyEPD2 then EasyEPD2 will display the error message 2 28 ISSUE9 Thermo Scientific Page 53 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK TECHNICAL DESCRIPTION 4 6 EPD Internal Processing amp Facilities This section describes the internal processing performed by the EPD and the facilities provided over th
65. eak Hp 0 07 h Dose Gegen e ee Hate al L LI JSv h Note Peaks can only be cleared via the IR communications link EPD Confidence Test To perform the EPD confidence P m test press and hold the button until A lo lo lo this top level display appears a a Lon Only one sub display is available Test This test can be run at any time during operational use as a confidence check that the EPD is functioning correctly Throughout the confidence test the heart beat activity indicator flashes once per second The confidence test can be stopped at any time by pressing the button Note During the EPD confidence test a brief detector test is performed during which dose accumulation is momentarily inhibited 1 to 2 ms approximately Double press the button The EPD will commence its confidence test routine as follows 1 The all segment display is displayed for approximately 5 seconds This allows the user to check that all segments are functional see Figure 3 2 2 The alarm will sound and the LED will flash for approximately 2 seconds This indicates that the sounder and LED are functional 3 The all segment display will disappear The alarm will continue to sound and the LED will continue to flash at an increased rate for approximately 6 seconds This indicates that the LCD segments can be turned off and that the tone frequencies are functional ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL
66. ecycled through them Further information on Thermo Fisher Scientifics compliance with these Directives the recyclers in your country and information on Thermo Fisher Scientific products which may assist the detection of substances subject to the RoHS Directive are available at www thermo com WEEEROHS ISSUE 9 Page x Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 1 1 INTRODUCTION SECTION 1 INTRODUCTION This handbook is for the Thermo Fisher Scientific Electronic Personal Dosemeter EPD models as follows EPD BG The standard Beta Gamma variant at Mks 2 0 2 1 2 2 2 3 2 5 EPD BG at Mk2 5 is also known as EPDMk2 EPD G The Gamma only variant at Mk 2 0 2 5 To simplify nomenclature the term EPD has been used throughout this handbook for all matters that apply to both EPD models whereas EPD BG or EPD G are used for matters specific to each of these models This handbook applies to EPD software version 14 A separate handbook covers the EPD N2 which measures Gamma and Neutron Radiation Note that the Mark number abbreviated Mk is used to track the build state of each EPD model and operates independently for each model The Mk number is increased whenever there is a significant change introduced into the design or manufacture of the EPD model in question General The EPD BG is a personal radiation Dosemeter that detects and measures beta and gamma radiation The EPD G is a similar
67. eecessceeseecesseeessecesseseseecesseeeneess 6 Gettin Started ies cial Eed 7 GL OSSATY EE Vii Vili I Infrared IR Communication 2 infrared communications Interface 5 Iotrs rechlpterlage treet terre A A e 51 UA Neo 8 64 01 6 EE EEN 1 ISSUE Document iio daa i ISSUING ER Gd RE 13 L LCD display ii A A R 2 LED dit 16 Lithium Thionyl Chloride eee eecsseceseseeseseseeeeseseeeeecsesessescsesecsenesacaceesecaenenassceececaeneasaceececaeeeeateeeesees 45 M Maintenances ee ee ee er e E sks ageless Sosa a Kee 84 Manufacturers Details i Mechanical Descripti0N ooooonccocnonionococononononnnonononononononnnnnononnnnnononcnnnonon cnn AEE n ancora cnn ie 48 Ma e a e a oe 54 N Non fatilty Blocks coimas ita 61 O Engler 33 Off Mode OEM nest ct td e e es A dl dates lee al e io a Breads ater ested 61 Operating OU Eege 15 Operating Temperaturene s a Ea E EE E rE Ea 50 ISSUE 9 Page 114 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 Index 5 2 lt a peer eae iaa 22 UV EE 1 P Pocket Glip Lanyard 2 omnia dit dt ege ed arteria 91 Se A R PRE DEE E 6 Respondo ec Ses Hake O O Seen vii 3 35 42 RUNTIME a o e a o to OS 61 S SEACE MEO ed aE 5 A A 6 Silicon Diolde detectas t 1 5 Startup SCQuUENCE iaa 11 T TECHNICAL DESCRIDIION cc cccccccccececececsescesececececseececececeeececeseseseeeeeeseeseseseseseseseeeseseseseeeceeecs 44 UNI EE 37 U USA Sal s Mie ia i W Wa iia a
68. ely Cause Recommended Action Blank Screen Battery Failure Attempt to communicate with the Nothing displayed on the EPD via the IR communications link LCD not even Heart to prove diagnosis Beat indication Remove old and Insert new battery and restart unit see section 2 1 2 Communicate with the EPD via the IR communications link to access stored data Nothing displayed after Battery cap not battery is inserted corrected seated Remove and replace battery cap replaced or battery out of see Section 2 1 2 specification Use a recommended battery Static Screen 1 second timer error le Attempt to communicate with the Heart Beat indication EPD via the IR communications not flashing link Replace battery and restart unit see section 2 1 2 Communicate with the EPD via the IR communications link to access stored data If there is still no Heart Beat contact supplier Faulty Button Muting Disabled Communicate with EPD via the IR Cannot mute alarm communications link using button Clear alarm conditions Enable muting if required No response to button Hardware fault Communicate with the EPD via the IR communications link to access stored data Contact supplier Faulty Sounder Hardware fault Contact supplier No audible alarm during Confidence Test Sound fails to operate in Sounder Disabled Enable sounder if required alarm condition ISSUE 9 Page 72 Thermo Scientific ELECTRONIC PERSONAL DOSE
69. erational state However as described above the cause is a user operational problem and not a fault in the EPD An EPD will only raise this condition if it is first triggered by the system software in effect a message is passed to the EPD saying raise an alarm if the following write operations don t complete successfully within N seconds If the condition does occur then it is necessary to train the users not to remove the EPD from the ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 FAULTS AND RECOVERY ACTIONS IR field until indicated i e by the system through displays Leds etc However the EPD communications software is tolerant of short duration loss of connection If the condition does occur it is normal for system software to clear the alarm and LCD display automatically when the EPD is re presented to the IR media The system software then checks the status of the EPD completes any necessary data write operations advises the user what to do and clears the alarm The display then returns to normal If the condition arises regularly then this may indicate a problem in the design of the system software i e the user interface If the user or system fails to clear the alarm in the way described above then the condition can easily be cleared using EasyEPD2 ISSUE 9 Thermo Scientific Page 75 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK FAULTS AND RECOVERY ACTI
70. esseseseesesesesseses 71 5 3 2 Event History store 71 5 39 Dose Quality Factors ii tes Mice eka Le e dee 72 5 4 BLANK LCD DISPLAY AND OTHER Fauure no nononnnncn cnn nononnnnos 73 5 5 INITIALISATION ERROR LCD A 75 5 6 COMMUNICATIONS ERROR LCD zs 75 5 7 LCD DISPLAY ERROR CODES no nononn nn nn nro rornnnnnon anna nemnnnnos 77 5 8 RECOVERY PROCEDURES cscesesesssscsenessesesesccsenenssseresescenensssnesecsesensssenesecseneneasenesesnes 78 5 8 1 Logging Faults Extracting Data 78 ISSUE 9 Page iv Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 CONTENTS 5 8 2 Clearing TAUNS 2 3 eech WER E dee RE RES 78 SECTION KEE 85 MAINTENANCE eech 85 6 1 CALIBRATION EE 85 6 2 THE EPD BATTERY ee ee ee MiG Ais EE dE 88 6 2 1 Replacement Batteries cccccccecssscscesssececssscscesesecscecssecsceassceeceasseesceasseesseasseesseaseeee 88 6 2 2 Battery LOAK AGE ccsccesssssccesessescesessescsescescussscescusessescusesabacucsssescudssceacadsagessaasaeaceaseees 88 6 2 3 Lithium Thionyl Chloride Battery Wamimg 89 6 2 4 Replacing the EPD Patten 91 6 3 EPD CLIP A A EN 92 6 3 1 Removing the EPD Lanyard Plate Clip Assembly ccccccecsceecesecesseseseeeeeeseseeeeseeees 93 6 3 2 Replacing The EPD Lanyard Plate Clip Aesembih 94 6 4 CLEANING ici eene he cece vee ee ee eg 95 6 4 1 GONNA Dinh aa ha ia AA Rae 95 6 4 2 Radiological Cleaning stenene eao e e e E EER E E 95 6 4 3 Cleaning after a Batte
71. g mode i e ON or OFF Alarms The EPD retains a record defining which of the following alarms has occurred The record is normally cleared by system software at the start of an issue period 1 3 Dose Alarm Flags As section 4 6 8 2 3 Dose Rate Alarm Flags As section 4 6 8 3 Return For Read The EPD clock has exceed the Return For Read time Faults The EPD retains a record of the following faults flags 1 Event Logged An event possibly but not necessarily a fault has been logged in the EPD s event store 2 Connection Failed Communication with the EPD failed typically due to the EPD being removed from the Reader prematurely 3 Cal Factors Bad The EPD calibration factors failed a CRC check and cannot be recovered from secure store ISSUE9 Thermo Scientific Page 61 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK TECHNICAL DESCRIPTION 4 EEPROM Fail An un recoverable EPD secure store failure occurred 5 Bad Sectors The number of bad EPD secure store sectors There is a maximum of nine spare sectors 6 Detector Test Fail The EPD detector test was run and the number of counts received were less than required to pass the test 7 Detector Threshold Fail The EPD detector thresholds failed to load successfully 8 Radio Fail Reserved for future use 9 Other Fault A fault occurred causing the EPD to reset 10 Disabled The EPD is not calculating dose ISSUE 9 Page 62 Thermo Scientific
72. he LED will slow flash 5 The all segment display will disappear and the default display will appear This indicates that the confidence test has been successfully completed and that the EPD is ready for operational use ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 GETTING STARTED Issuing an EPD In order to issue an EPD i e assign it to a person the EPD should be configured with a numerical User ID and optionally with a User Name There is a similar but separate configuration for Approved Dosimetry Service ADS The User Name and numerical ID can only be configured via the IR communications link Controlled and ADS User IDs can be viewed via the EPD s LCD display Detailed instructions to display User IDs are given in Section 3 5 Wearing an EPD The EPD should be worn under the direction of the health physicist For most operating conditions it is recommended that the EPD be worn on the outside of any protective clothing see Figure 2 5 Note that the button should be facing outwards Wearing the EPD on the outside of protective clothing has the major advantage that the user can read the EPD s LCD display and operate the button as required Typically the EPD should be worn on the chest or the waist The type of outer protective clothing will determine how the EPD is attached i e the EPD clip or lanyard For example if the protective clothing has no breast pocket or the use of a
73. hen the backlight is enabled but currently off the first short press of the button serves only to activate the backlight and does not cause a change of display selection This may cause confusion in bright day time conditions when the backlight effect is not apparent and the user may assume that a button press operation has somehow been lost ISSUE 9 Thermo Scientific Page 15 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK OPERATING INSTRUCTIONS The backlight activation causes a temporary alarm muting effect see section 3 2 5 Display Definitions Indicates that the Dosemeter is Transmitting or Receiving Teledosimetry data Indicates that the Dosemeter is in Teledosimetry mode Dose and Dose Rate Alarm Flags The appropriate flag is displayed when an alarm condition has occurred Button Operation Long Next Menu or Mute Alarm Shor Next Display or Lock on Double Start or Select See Table Heart Beat Flashing indicates Dosemeter active T Indicates Total Dose is display ed L Not accumulating dose O Alarm LED Units of Dose and Dose Rate currently displayed LCD Digits Flash for over range Fx xx Fail Code xxx Fail Code Lower First Upper Last On Peak Y Off fADSID Battery Low minimum of 10 hours life remaining gt Ge ET Return Flag Activated at a User programmable date and time requires a teleadapter to operate Default A
74. his configuration so that external software such as EasyEPD2 can display values in the appropriate units Prevent Alarms Off Disable Quiet Low Frequency This ensures that Alarm sound level is gt 85dB A at 30cm from the EPD EPDs can be configured such that the alarms may not be changed to off disabled or set to quiet or set to low frequency The alarm times may not be less than 10 minutes they may be 0 continuous EPDs are factory configured to the required Alarm Configuration Settings and then set up such that any subsequent attempt to configure them off disabled or quiet low frequency or change the settings listed above will NOT be allowed This ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 INTRODUCTION configuration is required for PTB approved EPDs The prevention mechanism is controlled by the reader comms interface dll not the EPD Prevent Change of DP or Units EPDs can be configured such that the settings for decimal places dose units off display wearer display over range flashing battery alarm levels and 1 minute logging cannot be changed The prevention mechanism is controlled by the reader comms interface dll not the EPD Gamma Only EPD firmware at version 13 and above can be configured for the gamma only hardware configuration Thus it can be seen that common firmware is used in the EPD BG and EPD G Dosemeters but subject to factory only configuration to suit the har
75. hroughout To convert to rem multiply all values by 100 ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 GETTING STARTED SECTION 2 GETTING STARTED This section describes the general procedures that must be carried out to ensure that the EPD is set up correctly and is functionally operational 2 1 Setting up The EPD requires very little setting up Setting up is primarily confined to 1 Unpacking the EPD 2 Inserting the battery 3 Checking the initialisation sequence 4 Checking the default settings 5 Performing a confidence test A general view of the EPD is shown in Figure 2 1 External features are described in Table 2 1 Infrared LED LCD Display Top Interface Clip Battery GEERT Sy Compartment Back KS Battery 4 Side H Button y Front Side Sounder Beta Window Figure 2 1 External View Of The EPD Note the Beta Window is blocked in the case of the EPD G unit ISSUE 9 Thermo Scientific Page 7 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK GETTING STARTED Page 8 Battery Compartment Houses an Alkaline AA battery 1 5 V or a Lithium Thionyl Chloride LTC AA battery 3 6 V Infra red Interface Infra red communications interface to the EPD Button User interface for EPD control alarm acknowledgement and LCD display selection Sounder Provides an audible indication of an EPD alarm Beta Window Allows beta p
76. ich shows all segments in the on state All segments are activated in this way temporarily during the start up sequence and during user initiated Confidence Test see Section 3 5 7 On completion of the start up sequence or Confidence Test the default display will appear The default display is preset at the factory to show Hp 10 the penetrating or deep dose or another default display as specified by the customer The default display can also be changed by the customer after delivery to any display shown in Figure 3 4 Default settings and other display controls are changed using a suitable IR communications link and software e g EasyEPD2 For example the display can be configured to display values in either Sieverts or rems The EPD is provided with many different displays in order to provide a powerful stand alone facility for users not having direct access to communications software such as EasyEPD2 However for many users the sheer number of displays available may lead to confusion and Thermo has therefore provided a facility for unwanted or unnecessary displays to be disabled Backlight Operation The EPD is equipped with a display backlight to enable the display to be read in the dark The following points should be noted The backlight will only function if it is enabled over the IR communications link The backlight only operates for a short period after the button is pressed This is to conserve battery life W
77. ing The Dose Alarm Thresholds To change the 1 Hp 10 dose alarm threshold select the display above and double press the a button The display will change to the following with the digits flashing Alarm Set Limits 10uSv to 1Sv Pressing the button will increase the alarm threshold in the following steps 10uSv 50uSv 100uSv 500uSv 1mSv 5mSv 10mSv 50mSv 100mSv 500mSv 1 0Sv When the required threshold is reached double press the button to confirm the value and the flashing display will stop If you start to change the threshold and change your mind this option can be aborted as follows Short press the button until the following is displayed letters KEE ii flashing Double press the button m gt e to confirm that you wish to escape gt fa alla ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 3 5 10 OPERATING INSTRUCTIONS and return to the previous alarm threshold If the ESC screen is displayed and the button is not pressed after default time out the display will return to the dose alarm threshold that was being set up Again if the button is not pressed the display will return to the default screen after a further time out period Displaying Setting Dose Rate Alarm On Off Thresholds To display and or set dose rate alarm ON thresholds press and OT hold the button until this top level gt o o display appears LA Ih
78. inuous operation at an average dose rate lt 5uSv h with the alarm sounding lt 5 hours total during battery life Or One standard AA Alkaline battery 1 5 V giving typically 50 days continuous operation at an average dose lt 5uSv h with the alarm sounding lt 2 hours total during battery life Activated on start up and by the button when the CONFIDENCE TEST mode is called up see Section 3 5 7 Performed during the start up sequence and as a background test and under demand via the IR interface Normal dose processing is inhibited during detector test for a period of 1 to 2 ms Configurable time interval between 1 to 60 minutes 15 minutes recommended 98 dB A to 101 dB A at 20 cm 4kHz loud mode 80 dB A to 90 dB A at 20cm 4kHz quiet mode The EPD circuitry is designed to operate at 3 6V DC The EPD can be powered by either a 3 6V Lithium Thionyl Chloride LTC Sulphurous Oxychloride SOCL2 battery or a standard 1 5V AA Alkaline type battery The EPD software runs an internal battery condition test at regular intervals between 1 and 60 minutes This time interval is factory preset to 15 minutes and should not be adjusted except following consultation with Thermo Fisher Scientific From software version 13 onwards the battery test interval in off mode is 32 times the on interval Thermo Scientific ISSUE9 Page 45 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK TECHNICAL DESCRIPTION Page 46 E
79. ions Blank display and other uncontrolled faults Communications Error over the IR link LCD Display error codes Recovery Procedures See Visual and Audible Fault Indication An EPD failure is usually indicated by a visual and audible alarm In most instances the EPD will display an error code on the LCD and the LED will flash The default audible alarm is as follows Alarm rate slow intermittent rate If alarm mute is enabled for the fault alarm the sounder can be silenced and the alarm Led extinguished by the action of pressing and holding the button The fault alarm can also be set to self mute after a timeout period in order to preserve battery life If this happens the unit will give a short sound every 30 seconds thereafter An EPD conveys faults to the user by a number of displays e g Initialisation Error on the LCD Communications Error on the LCD Error Code Fxxx on the LCD Blank Display ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 FAULTS AND RECOVERY ACTIONS Other faults e g display lock up no heartbeat etc Note Communications Error as displayed here is normally caused by the EPD being removed from the Reader prematurely e g part way through an Issue or De Issue process ISSUE 9 Thermo Scientific Page 69 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK FAULTS AND RECOVERY ACTIONS
80. ircumstances used in excess of 70 C and never exposed to temperatures in excess of 100 C opened punctured crushed or tampered with Batteries in storage should be kept in an isolated dry well ventilated cool environment and kept out of direct sunlight Storage temperatures should be below 30 C Batteries are susceptible to fire and abuse Some manufacturers provide batteries with a safety vent which allows a controlled release of electrolyte if these conditions prevail If the EPD has been damaged in a manner that could affect the battery care must be exercised during battery replacement The battery may have vented into the EPD case and caused the EPD to become pressurized Electrolyte leakage can normally be detected by the smell of sulphur dioxide and or the presence of electrolyte solutes If a leakage is suspected i the battery should be removed from the EPD using protective clothing gloves and goggles ii the battery should be placed in a self sealing polythene bag or equivalent and disposed of in the correct manner see below iii Wash with copious amounts of water any areas that come into contact with the electrolyte especially the skin Seek medical advice if electrolyte comes in contact with the eyes Batteries must be disposed of in accordance with the manufacturer s recommendation and Local National regulations 7 If LTC batteries are to be transported by aircraft the batteries must be in
81. l infra red communications interface The Thermo supplied EasyEPD2 program reads and writes data to the EPD via the Infra red communications link and displays the data in a PC window Thermo also produces a range of Access Control Systems for use with the EPD Dose is accumulated separately in the EPD in three stores Dose Total Dose and ADS Dose The use of several stores allows dose to be recorded over differing periods for example the Dose store may be used for each job or task performed and reset after each whilst the Total Dose records the total or aggregate dose from all the jobs or tasks performed ADS Dose is a password protected dose store intended for legal dosimetry applications Note that audible alarms are given if either the accumulated dose or dose rates exceed programmable threshold levels Dose alarms are raised against the Dose store only ISSUE 9 Thermo Scientific Page 5 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK INTRODUCTION Page 6 The EPD is a sealed unit and is splash proof The unit will withstand short periods of immersion in water but is not designed for prolonged immersion under pressure General maintenance is confined to Removing replacing the EPD battery Removing replacing the EPD clip assembly Clearing fault conditions where possible Checking the functionality and calibration of the EPD Keeping the unit clean gt Zo gt This manual deals with Sieverts Sv t
82. la creeeren EEN Eet 57 A EE E e 58 4 6 7 Dose Quality FIAGS 0 ceeccccsceccscssesesesseseseseeceseseseecenencsesesececseeceaeeceeceeseeceaeaceeceeaeneeateeeeeees 59 I Reset COUNT iii EEN 59 ii Knock Time Seconde cnn reno rernnrnnnnnnrernnnnnnnnnninons 59 Il DOS O VETADO ci a A A A das 59 iv Dose Rate Overrange sireni e e E E E E E NEE i 60 V Counter OVOP TANGO Ae ee eeh hater a ihe teeth aA E 60 vi Abuse Wammg oran nono none rn an anne nnannnnnens 60 AIROSO CARA 60 viii Low Voltage EPD software version 11 and Iater 60 ix Detector Fault EPD software version 11 and Joterl 60 4 6 8 Dose And Dose Rate Alarm Droceseimg 60 4 6 9 EPD Operating Status 61 EPD Rur and Off MeS ici added 62 ERD State een ee A EARE A A E ds A EARE 62 TEE 62 Te 62 4 6 10 eerste eelere Ee 64 4 6 11 Vent History OTC IA Eege eee Ate eta 65 4 6 12 ClearOnON Eacilllyinacin ninia ii tacita 66 4 6 13 Blees datado 66 SECTION A es sisaccessectus vant saitessectes sages ctaztvatecedeccesducaetsanceage ddeadessnectescecsuausdtzs 69 EPD FAULTS AND RECOVERY ACTIONS ccccsseecsseeeesseeeeseeeeeeeeeeeeseseaeenseeeeseeeseseaeenseeeeees 69 5 1 OVERVIEW 2052055038 hacienda clits EE a ae 69 5 2 VISUAL AND AUDIBLE FAULT INDICATION c cccceseseseseeceseseeseccneeceseecsececuceceateceeesenteeeaees 69 5 3 INTERNAL LOGGING OF FAULT CONDITIONS 71 5 3 1 EPD Status Faults Record ssessesseeeesesesesssseeeesesessesesreresesessesesreseses
83. larm Tone Definitions User Configurable Slow Failure Fat Dose Rate Alarm Threshold Exceeded Continuous e 9 58 Alarm Threshold Exceeded TT SE E A A A Over range Alarm 3 2 Audible And Visible Alarms 3 2 1 Alarm features Overview The EPD contains a sounder and alarm LED see Figure 3 1 which are activated together when certain alarm conditions occur Alarms are also indicated in various ways on the LCD Under alarm conditions the LED illuminates red and the sounder sounds at 4 kHz or 2 kHz with an intensity of between 98 to 101 dBA 4 kHz Loud Figure 3 1 Alarm LED And Sounder It is possible to disable the sounder and or LED so that only one or neither will activate but alarm flags on the LCD remain until the condition is normalised The alarm sounder can be configured for quieter operation for example for office or hospital environments ISSUE 9 Page 16 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 OPERATING INSTRUCTIONS Alarms are acknowledged by pressing the button long press This action will extinguish the alarm LED and mute the sounder It is possible to disable the mute function via the EPD IR communications link see section 3 2 5 Note that certain operations and events will automatically mute the audible alarm for a short period because of the high electrical current required These are as follows The period of interruption to
84. last measured battery voltage The displayed voltage is in volts to the nearest 2 decimal places The EPD can be configured to automatically run battery test at regular intervals between 1 and 255 minutes 15 minutes recommended When in OFF mode the interval is 32 times the set value this is to conserve battery power ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 OPERATING INSTRUCTIONS 3 5 14 Time to alarm Long press to navigate to the time to alarm menu Short press to view the time to alarm value which 2 D is displayed in Hours and Minutes HH MM The time to alarm is calculated as the EPD pm Gem Gem Gem Hp10 1 dose alarm threshold divided by the EPD LU Hp10 dose rate The maximum value is 99 hours 59 minutes which is displayed when the time to alarm is greater than this time or when not accruing dose The minimum value is 00 00 which is displayed if the EPD is in Hp10 1 dose alarm The display is updated every time the dose rate is calculated ISSUE 9 Thermo Scientific Page 43 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK TECHNICAL DESCRIPTION SECTION 4 TECHNICAL DESCRIPTION This section provides a technical description of the EPD and contains a summary of the EPD s radiological features together with a summary of the EPD s electrical mechanical and environmental characteristics 4 1 General The EPD is of rugged construction and is suitabl
85. led for the alarm The appropriate LCD alarm flag is always activated The user can silence mute the alarm by pressing and holding the button provided mute is enabled on the alarm This will also extinguish the Alarm LED However the LCD alarm flag remains set until such time as the alarm condition is cleared Dose rate alarms are self muting when the dose rate falls below the alarm off threshold level Similarly dose alarms are self muting if the dose is cleared or the thresholds suitably increased over the IR communications link Note that if the display backlight is enabled a short press of the button turns the back light on and temporarily silences any active alarm This is because the EPD unit battery cannot supply sufficient current for both backlight and sounder together After the display timeout period the backlight is automatically turned off and the sounder re enabled Thus a short press may appear to mute the alarm and confuse the user under such conditions It is necessary therefore for the user to remember that a long press is required to mute the alarm ISSUE 9 Thermo Scientific Page 23 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK OPERATING INSTRUCTIONS 3 3 Page 24 Button Operation and Display Selection The EPD will display a range of data to the user The data displayed is selected by use of the button The full range of displays is arranged on a two dimensional grid as shown in Figure 3 4 There are
86. locked state and only changeable by Thermo On request Thermo will supply units with calibration factors unlocked User dose readings also include detector counts and associated quality data such as impact counts reset counts fault data Dose and count data may be sensibility tested EPD may be permanently issued by ADS but also used on an access control system by the same wearer Dose and supporting data is accumulated in an additional password protected ADS store A powerful and efficient messaging interface allows fast and secure data transfer and speedy issue and return times Data is protected by 16 bit crc Issue and Return times take circa 1 second Returns take longer if extensive dose profile data is being extracted Every EPD has a unique serial number provided on the case label numeric and bar coded and duplicated in internal memory The latter is accessible over the communications link Every EPD is manufactured to a defined Mark Number which is detailed on the case label and duplicated in internal memory The latter is accessible over the communications link 12 character numeric wearer ID displayable on EPD LCD both control and ADS wearer IDs By convention the wearer ID for a non issued EPD is set to FFFFFFFFFFFF 22 character wearer name may be used but is not essential For version 11 firmware and later the first 12 characters of the wearer name may be displaye
87. ly indicative of a fault in the EPD and due to the complexity of achieving calibration over the full energy range it is recommended that any EPDs that fail calibration checks are returned to the manufacturer for repair or replacement ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 6 2 6 2 1 6 2 2 MAINTENANCE The EPD Battery The EPD can use either a Lithium Thionyl Chloride LTC 3 6 V battery or a standard 1 5 V AA battery see Section 4 2 A battery change is within the scope of any competent user However care must be taken when replacing the EPD battery see Section 6 2 3 If the EPD is to be stored for a prolonged period of time the EPD battery should be removed There is no definitive battery installation period The best philosophy to adopt is if in doubt remove the battery Replacement Batteries Replacement batteries must be suitable for installation into the EPD On no account must excessive force be used to insert the battery into its compartment The following are recommended replacement batteries Sonnenschien Lithium 3 6 V SL 760 Tadiran Lithium 3 6 V SL 760 Tadiran Lithium 3 6 V TL 5903 Duracell Procell Alkaline 1 5 V MN 1500 Other AA batteries may be suitable but Thermo should first be consulted especially in the case of Lithium batteries The user is also advised that 1 The length of the battery including the battery anode pip should be in
88. mp These comprise alarm and fault events see tables 4 1 and 5 2 From software version 11 EPD ON and OFF events are also recorded see Table 4 1 Note The Event History time store wraps round after 194 days of operation After this time previous event associated day date s cannot be considered as accurate In addition elapsed time during loss of power is not recorded Events On Events Off Code Text as displayed by EasyEPD2 i EE Failure Alarm on Over Range Alarm on Hp10 Dose Alarm 2 on Hp07 Dose Alarm on Hp10 Dose Alarm 1 on EasyEPD2 D Hp07 Dose Alarm off Hp10 Dose Alarm 1 off Version 11 and later firmware only Other Events Battery changed to High Voltage type e g 3 6V Lithium Battery changed to Low Voltage type e g 1 5V Alkaline Version 13 and later firmware only Table 4 1 3 parts EPD Events logged to the Event History Store ISSUE 9 Page 64 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 4 6 12 TECHNICAL DESCRIPTION ClearOnON Facility This is a manufacturer configurable option not normally enabled on standard EPDs The used may also configure this feature as enabled or disabled If the EPD is turned ON either from the button or via comms the following will occur when the EPD is switched from Off to ON mode The Dose will be cleared Total Dose is not cleared The Dose quality factors will be cleared The Peak dose rates and times are cleared
89. munications still work EPD Status Faults attached Event History attached Dose Profile attached Extracted using EasyEPD2 DESCRIPTION OF FAULT DETAIL OF ACTIONS TAKEN TO RECTIFY FAULT Did fault recur after battery replacement or EPD Reset CONDITIONS PRIOR TO FAULT Environment etc FURTHER DETAILS MAY BE GIVEN ON REVERSE FOR MANUFACTURERS USE Assessed by Notes HB40521 EPD FAULT LOG FORM HB40521 ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 Index A ABUSE El ue EE 59 Alarm Ee 55 Configura EE 18 EIERE Ehe 16 Y A EE Eeer 21 MUI ense aaa tated E aaa esi n Menomonee 23 PI e o 19 Sounder V OIUM EG iii A is 45 TOM ii 20 Alkaline battery sonipa einer to ci Isora 45 B Ee LEE 15 battery Replacement sss E Aen See O a iat et 90 BAN eebe ee deed dite bese it ee ere ee te 87 Warning NO ix Battery Gap eegene A a 9 ENS 9 Battery EE 45 47 B tter SIA iris A tages bd teen eee Eta 89 Beep button enabling disabling no cononncncn nono rorcnn nn cnnn nn nencnnnnos 39 B la radial EE 5 BUON e dd o e a O 2 5 Button Oper e asasteaci asa agate Seaside erase te cale 24 C ee EE 84 Gase material cia gereest eege eege EE ee eege on 48 CIS une EEN 94 Clearing Dose RTE 35 E e GE 48 Communicating with the EDD 51 52 A A O O Ea ATIS 12 Running the Confidence Testis cscs fase di ia 34 CONTENTS 5 eS oe hs ea sh ek Be Eh ea el ee ili A te Wein Ri ee ee eed 59 D Reine TEE 94 REIS
90. nd the button is not pressed after default time out the display will return to dose alarm threshold that was being set up Again if the button is not pressed the display will return to the top level default screen after a further time out period ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 3 5 11 Thermo Scientific OPERATING INSTRUCTIONS Notes 1 The On threshold must always be greater than or equal to the Off threshold If an attempt is made to set the On threshold below the Off threshold the Off threshold will be set automatically to the same value as the On threshold If an attempt is made to set the Off threshold above the On threshold the Off threshold will be set automatically to the same value as the On threshold Setting The Sounder To change the EPD sounder i settings press and hold the LUC button until this top level Cape IW Iw lo display appears ome Three sub displays are available in the following sub display order Button Beep Enable Disable Dose Chirp Adjustment Internal Counters Display Note This option will not enable disable the alarm sounder Enabling disabling the sounder under alarm conditions can only be set via the IR communications link see Section 3 2 4 ISSUE 9 Page 39 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK OPERATING INSTRUCTIONS
91. ng on customer requirements see Figure 6 3 This makes the unit more comfortable to wear with the lanyard when the clip is not required If the EPD is shipped with the spring clip fitted to the lanyard plate it should be considered as an integral item Removal of the clip from the lanyard plate is not recommended ISSUE 9 Thermo Scientific Page 91 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK MAINTENANCE Spring Clip if fitted Lanyard Plate detail under spring clip Push Down To Open Clip Figure 6 2 EPD With Clip Assembly 6 3 1 Removing the EPD Lanyard Plate Clip Assembly To remove the lanyard plate clip assembly proceed as follows 1 If the spring clip is fitted to the lanyard plate open the jaws of the clip by pushing downwards see Figure 6 2 to give access to the lanyard plate A view of the lanyard plate spring clip removed is shown in Figure 6 3 Note the tang on the lanyard plate it is not necessary to remove the spring clip from the lanyard plate in order to gain access to the tang Lanyard Plate Clip Assembly Lanyard Plate Removed Tang Figure 6 3 EPD With Lanyard Plate ISSUE 9 Page 92 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 MAINTENANCE 2 Insert a screwdriver with a blade width of 3 to 4 mm under the lanyard plate tang and apply gentle downward leverage on the screwdriver see Figure 6 4 At the same time push the lanyard
92. ound and the LED will flash if enabled The over range alarm will also cause the LCD display to flash every second See section 4 6 12 for Pulsed Rate Over range description Notes 1 The over range alarm condition is latched and the LCD will continue to flash even after a temporary dose rate over range condition has cleared The over range conditions are recorded in the EPD EEPROM and must be cleared over the IR communications link before the display will stop flashing 2 The over range alarm can be muted if enabled The EPD audible and Led alarm will not recur after muting should over range conditions re occur e g in the case of a second dose rate over range alarm until the latched condition has been cleared over the IR communications link However the LCD will continue to flash 3 For software version 11 and later EPDs the over range indication on the LCD may be configured to operate in either of two ways By default the LCD will alternate between the current display selection and a blank display The alternative configuration causes the LCD to alternate between the current display selection and 9999 4 The ADS dose over range alarm only operates if the unit is ADS issued ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 OPERATING INSTRUCTIONS 3 2 5 Alarm Muting Alarm conditions cause the sounder to be activated and the alarm LED to illuminate subject to these facilities being enab
93. play fi i a Ve ww U goma P AU IL In systems using 8 or fewer digits for the User ID it is usual to disable and thereby remove the unused displays e g the first and second display in the above example For software version 11 and later the first 12 characters of the wearer name may be displayed on the EPD LCD in place of the wearer ID The character representation on a seven segment display is necessarily limited see table in Appendix C 3 5 2 Displaying Hp 0 07 Doses Dose Rate and ADS User ID V 4 Y T To display Hp 0 07 doses press ee ie H Z and hold the button until this top O DO A level display appears Three sub displays are available in the following sub display order Hp 0 07 Dose Hp 0 07 h Dose Rate ADS User ID Digits Hp 0 07 Dose Display ISSUE 9 Thermo Scientific Page 29 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK OPERATING INSTRUCTIONS Short press the button to display the current dose This dose ag parameter is used for tactical dose monitoring e g per task etc SIS Display Range OuSv to gt 16Sv auto ranging Note Over range gt 10 0 Sv is indicated with a flashing LCD display see section 3 2 4 Hp 0 07 h Dose Rate Display Short press the button again to display the current Hp 0 07 h dose w H oll rate Only the first two significant A A F figures of the dose rate are l
94. pplier All 9 spare sectors have sectors available been used This fault is unlikely to occur in normal operation Tests have shown that the GEI are very resilient gt 1 million bit toggles 061 EEPROM bad sector Return to supplier This fault is unlikely to occur requested sector number is invalid 062 EEPROM bad sector Return to supplier This fault is unlikely to occur access table entry number Sector Access Table is is invalid corrupted or EEPROM read failed EEPROM could not read Return to supplier Executes a Deferred Log from the sector access Fault with RECOVERED table area option with the given fault code but only if the EEPROM fail bit is not set If the EEPROM fail bit is set the fault is ignored to stop the error store being flooded with e faults the next entry 065 EEPROM could not Return to supplier gt reallocate data to a good sector ba o eee E next entry Data Module Code Text as displayed by EPD Recommended Remarks EasyEPD2 Action Customer Action NENNEN Data Module Error Reserved for future use ISSUE 9 Page 80 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 FAULTS AND RECOVERY ACTIONS Counts Module Code Text as displayed by EPD Action Recommended Remarks EasyEPD2 Customer n e eee Texas chip reset Battery Low but no Batt Low Status Reset into comms mode only counts
95. quirements over the IR communication link using suitable software such as EasyEPD2 These configuration options are explained in this handbook but the user is also referred to the EasyEPD2 User Manual which describes the parameters in more detail and how they are accessed Note that a few parameters are accessible only by the manufacturer and must be determined before delivery takes place calibration lock and PTB Approval are examples These manufacturer settings may constrain what the end user can configure in the EPD see below and section 4 5 2 Manufacturer Configurations The following configurations are manufacturer factory settable to order they are NOT customer configurable Dose Clear Mode Some customers require EPDs to be configured such that when the EPD is switched from Off to On mode either from the button or via a comms commana the dose and quality factors are cleared and the Return For Read alarm time is set EPDs are normally supplied with this feature disabled See section 4 6 12 for more details DDE SDE Some customers require a different EPD display that shows DDE Deep Dose Equivalent and SDE Shallow Dose Equivalent such units are factory configured to indicate this configuration so that external software such as EasyEPD2 can display values in the appropriate units cGy Some customers require a different EPD display that shows dose and dose rate values in cGy units such units are factory configured to indicate t
96. r based detergent other detergents may damage or attack the EPD s outer plastic coating A small brush should be used to clean any crevices in the case moulding After cleaning dry the EPD with a soft cloth During cleaning water may enter the alarm sounder aperture The sounder aperture is watertight although water ingress may deaden the alarm Any water should be shaken or blown out of the sounder aperture to restore the alarm noise level Radiological Cleaning WARNING DURING OPERATIONAL USE THE EPD MAY BECOME EXPOSED TO RADIOACTIVE CONTAMINATION THE EPD MUST BE SUBJECT TO ALL RELEVANT DECONTAMINATION PROCEDURES LAID DOWN _ BY_ THE RADIOLOGICAL PROTECTION AUTHORITY If radioactive deposits are present the unit should be decontaminated by carefully wiping it over using a disposable cloth or tissue dampened with a detergent solution and a small brush as described above or alternatively by using a disposable sticky wipe rag The unit should afterwards be checked with a sensitive radiation monitor to ensure satisfactory decontamination has been achieved Cleaning after a Battery Leakage Any leakage of the EPD battery must be treated with extreme caution In most instances battery leakage will be confined within the EPD battery compartment Minor leakage light smearing may be removed with a proprietary cotton bud moistened with a water based detergent However if doubt exists as to the extent of the leakage the EPD should be
97. r saving facility in which the detectors are turned off which is intended for short term storage e g overnight In the power saving mode the LCD will display OFF i e the EPD is off see also Section 3 5 5 In the EPD OFF condition battery drain is reduced to approximately 20 of the drain when the EPD is in the ON condition i e fully operational The EPD does not measure radiation when it is OFF Alternative OFF Display EPDs of software version 11 and later may be configured to display a 4 digit Hexadecimal value instead of the OFF display The 4 digit hex value may be written using suitable software e g EasyEPD2 This facility is to provide customers with the option of having the EPD display the Calibration due date when the EPD is Off So for example 2512 could mean calibrate on 25 December ISSUE9 Thermo Scientific Page 47 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK TECHNICAL DESCRIPTION 4 3 4 3 1 4 3 2 Mechanical Description Mechanical Characteristics And Dimensions Display and function control Single button on the front of the EPD recessed to prevent inadvertent operation Case material High impact Polycarbonate ABS blend Clip High impact plastic clip assembly comprising e spring clip lanyard plate Weight 95 gm including LTC battery and clip 88 gm with lanyard plate only clip removed Dimensions See Figure 4 1 Brief Mechanical Description The EPD is of semi mod
98. rm Dose Chirp Weight Dimensions Construction Case colours Clip Thermo Scientific 1 5V Alkaline AA or 3 6V Lithium Thionyl Chloride LTC AA batteries Observe Manufacturers warnings Diameter 13 9 to 14 6 mm Length 49 0 to 51 0 mm 5 months LTC 50 days Alkaline continuous operation depending upon usage dose rate alarms etc Battery tested nominally Every 15 minutes Warning raised with 10 hours remaining Via button and communications interface when enabled Bayonet style rotating battery cap with coin and security options Environmental and EMC seal 98 dB A to 101 dB A at 20cm 4kHz loud 80 dB A to 90 dB A at 20cm 4kHz quiet High low tone loud quiet off volume control in seven combinations of continuous or fast slow intermittent User mute enable disable control Real time chirp function with programmable sensitivity 0 01 uSv chirp to 100 uSv chirp From firmware version 11 the chirp uses the loud alarm setting Earlier versions use the quiet setting 88 gm with 95 gm including LTC battery and clip lanyard plate only 86 x 63x 18 5mm 28 5 mm with clip Plastic case Polycarbonate ABS blend RFI screened case and LCD Window contributing to excellent RFI immunity Agate grey Melon Yellow Nato Green Other case colours are available consult manufacturer High grip removable clip with attachments for lanyard strap break awa
99. ry Leakage 95 6 4 4 Periodic COleaniog errar 96 a A D a E E E A E E E T A sane ds 97 RADIOLOGICAL SPECIFICATIONS cccccsccesseeeeseeeeeeeeseaeseseeeeeeeeeescaesasneeeneeeeseeesaseaeenseeeeneas 97 APPENDIX Ba 101 ELECTROMAGNETIC COMPATIBILITY c ssecceeeeeeeseeeseeeeseeeeneneeseaeseseeeeeneeeessaeseseenenseeeees 101 APPENDIX Ci A dad 105 SUMMARY OF GENERAL PHYSICAL 8 FUNCTIONAL CHARACTERISTICS 105 THIS PAGE INTENTIONALLY LEFT BLANKAPPENDIX D cccesecssseeeeeeeeeeeeesteesesneneneees 110 APPENDIX D A ee E end seed EE 111 EPD FAULT LOG FORM iii EEN 111 ISSUE 9 Thermo Scientific Page v ELECTRONIC PERSONAL DOSEMETER HANDBOOK h C ADS CRC dB A DC DDE Dose DoseOnAlarm Double press EEPROM EPD EPD BG EPD G eV Gy HEX HPA H HZZ H22 h H h Hp 10 Hp 0 07 Hp 10 h EPD HB 40521 000 GLOSSARY GLOSSARY Per hour Degrees Celsius Approved Dosimetry Service or System Cyclic Redundancy Check Error checking code Decibels A weighted scale sound intensity Direct Current Deep Dose Equivalent alternative nomenclature for Hp 10 The accumulated dose to which alarm thresholds apply intended for tactical dose monitoring eg per day per week per shift etc Responder FACTORY configured EPD which accumulates Dose after a dose rate alarm has occurred Only for use by some First Line Responder Personnel hence the name Responder Pressing the button
100. s link Note To avoid false alarms due to counting statistics it is recommended that the Hp 0 07 h dose rate alarm is not set to less than 100uSv h Example 1 Hp 10 h dose rate on alarm threshold display set at a Gegen default value of 500uSv h gt On and Off alarm thresholds allow hysteresis for dose rate alarms see section 3 5 1 If hysteresis is not to be used the On and Off thresholds should be set to the same value Changing the Dose Rate Alarm Thresholds ON and OFF To change the 1 Hp 10 h dose rate on alarm threshold for Pin OI example select the above display Gegen LI and double press the button The Ma NUS V display will change to the following and the digits will flash Alarm Set Limits 10uSv h to 1Sv h Pressing the button will increase the alarm threshold in the following steps 10uSv h 50uSv h 100uSv h 500uSv h 1mSv h 5mSv h 10mSv h 50mSv h 100mSv h 500mSv h 1 0Sv h When the required threshold is reached double pressing the button to confirm the value and the flashing display will stop If you start to change the threshold and change your mind this option can be aborted as follows Short press the button until the following is displayed letters mm z y if flashing Double press the button gt e Je to confirm that you wish to escape gt L l L and return to the previous alarm threshold If the ESC screen is displayed a
101. ses by weighted summing ratios set during calibration of the counts received on the four detector channels Counts can only be read via the IR communications link although the least significant digits are visible on the internal counts display section 3 5 ISSUE9 Thermo Scientific Page 57 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK TECHNICAL DESCRIPTION 4 6 7 Page 58 Dose Quality Flags There are 7 dose quality flags set within the EPD Dose quality can only be read and cleared via the IR communications link They are normally cleared with the dose and detector counters at the start of an Issue period e g by Access Control or Issue Return software In dose of record systems EPD dose detector counters and quality factors are all read together and stored on the system database to allow later integrity checking of the dose recorded The dose quality flags are as follows i Reset Count The reset count is a count of the number of times the unit has been reset either by a removing and re fitting the battery or battery cap b use of an unsuitable or passivated Lithium battery c by a commanded reset via the IR communications link d by a software reset e by a fault condition Note that the EPD loses recent dose received since the last log of dose to non volatile memory as described in section 4 6 5 ii Knock Time Seconds The EPD detectors are susceptible to large mechanical
102. statistical errors but gives a fast response time The dose rate displays on the LCD are limited to 2 significant digits Longer time constants have to be used when averaging the beta dose due to the lower sensitivity of the beta detectors The time constant used maximises at 100 seconds below 1mSv h Due to limitations in the processing and memory available this time constant cannot be reduced when rapid changes are observed and the Hp 0 07 h dose rate is approximated as the sum of Hp 10 h and the beta dose rate This approximation means that at low gamma energies below 50 keV the Hp 0 07 h dose rate typically under responds by up to 25 in comparison to the Hp 0 07 dose response However above 25 keV the dose rate response remains within 30 accuracy criteria Peak Dose Rate The highest dose rate calculated by the EPD since this value was last cleared is termed the peak dose rate The peak dose rates and the times at which these peak rates occur are recorded and can be displayed on the LCD or read over the IR communications link Note Peak dose rate times are stored to 1 second resolution Counts The EPD has four internal counters HG Hard Gamma EPD BG and EPD G Dosemeters SG Soft Gamma EPD BG and EPD G Dosemeters FB Full Beta EPD BG Dosemeter only BC Beta Compensating EPD BG Dosemeter only These record the pulses output by each of the radiation detectors The EPD calculates the Hp 10 and Hp 0 07 do
103. ted and logged as follows Display fault code or indication Fxxx Internal faults logged in the EPD Status Faults record Contents of internal Event History store Dose and peak dose rate time data if a spurious dose fault is suspected Dose profile data if a sourious dose fault is suspected idee Tent Where possible the data should be obtained as screen dumps from EasyEPD2 and attached to the completed Fault Log Form Appendix D If a faulty unit is to be returned to Thermo it must be returned in a fully decontaminated and reasonably clean condition The battery must be removed but kept with the unit The date of installation of the battery should be marked on the battery Clearing faults The steps required to clear a fault are as follows 1 Extract data and fault information and complete a Fault Log Form Appendix D 2 Identify the fault type in Tables 5 1 or 5 2 and take the recommended action This will range from resetting the unit removing then replacing the battery to returning the unit to the supplier Thermo or other Supplier or Distributor 3 Ifthe unit is to be restored to operational use clear down all faults on display and in the Fault Status Record using EasyEPD2 This is to ensure that any subsequent faults are detected ISSUE 9 Thermo Scientific Page 77 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK FAULTS AND RECOVERY ACTIONS Control Module Code Text as
104. ted every second except at low dose rates where this period increases to a maximum of 14 seconds Alarms can be adjusted or inhibited via the IR communications link The dose rate alarms can be made to work with hysteresis i e the alarm off threshold is lower than the alarm on threshold The alarm ot threshold can be set in the EPD over the same range as can the alarm on threshold As the dose rate rises above the alarm on threshold the LED will flash and the sounder is activated see Figure 3 3 The alarm may be muted by pressing and holding the button unless alarm mute user silence is disabled The alarm will self cancel when the dose rate falls below the alarm oft threshold ISSUE 9 Thermo Scientific Page 21 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK OPERATING INSTRUCTIONS 3 2 4 Page 22 Hp 10 Dose U Rate LED amp Sounder Hp 10 Peak 100uSv h Alarm OFF 90uSv h Hp 10 Peak Time Rate Time Figure 3 3 Dose Rate Alarm Example The four most significant digits of the alarm Off and the alarm On thresholds can be viewed on the EPD LCD and if user has authority to modify the thresholds changed using the function button see Section 3 5 9 Over Range Indication If a dose rate exceeds 1Sv h or if a dose store increments above 10 0Sv was 1Sv up to version 14 an over range alarm will occur The sounder if enabled will s
105. tes the count down time period or the remaining count down time available E e Double press the button to start the digits counting down to zero The display is in units of minutes and seconds The maximum count down time available is 99 minutes 59 seconds The count down function continues when the display reverts to the default display after the display timeout period However it is useful to lock on to this display as described in section 3 4 Stopping the Timer To stop the timer double press the button again The digits will stop decreasing Reset Short press the button to select the 8 T display shown opposite Double press gt o the button and the display will flash al L Double press the button again to confirm the reset the display will show the reset time at its reset value The timer may now be started as described above ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK 3 5 5 3 5 6 Thermo Scientific EPD HB 40521 000 OPERATING INSTRUCTIONS EPD On Off control To turn the unit off press and hold the fi button until the word On appears Nito LI Only one sub display is available DIE E T ry On Off A This function enables the EPD to be placed in sleep or OFF mode In OFF mode power consumption is reduced considerably and the EPD stops measuring radiation Assuming that the display shows On double press the
106. that a dose has exceeded the corresponding dose alarm thresholds There are 17 and 2 dose alarms for Hp 10 and a single dose alarm for Hp 0 07 Three Dose rate alarm flags indicate that a dose rate has exceeded the dose rate alarm thresholds There are 1 and 2 dose rate alarms for Hp 10 h and a single dose rate alarm for Hp 0 07 h The dose rate flags are not cleared automatically when the dose rate falls below the reset threshold The 2 alarm threshold dose or dose rate always has a higher priority than the 1 alarm threshold The 1 alarm threshold can be considered as a warning value and the 2 alarm threshold as a critical value Therefore the 2 alarm threshold should always be set to the higher value Dose rate alarms can be configured to work with hysteresis That is the Hp 10 h 1st and 2nd dose alarms and the Hp 0 07 h dose rate alarm are each provided with separate ON and OFF thresholds When the dose rate equals or exceeds the alarm ON threshold the EPD will set an alarm flag and the sounder will sound and the LED flash if enabled The alarm is self cancelling when the dose rate falls below the alarm OFF threshold but the alarm flag remains set Alarm thresholds are set via the IR communications link or by the button if the user is granted authority see Figure 3 4 to any value in the following ranges 1 amp 2 Hp 10 h OuSv h to 16 777215 Sw h Hp 0 07 h OuSv h to 16 777215 Sv h 1 amp 2 Hp 10 1
107. the beginning of this section If necessary remove the battery cap from the case as described in ii and iii below ii If the battery cap is of the security type locate the two pips of the special tool into the two conical recesses in the battery cap If the battery cap is of the coin type locate the coin in the groove in the battery cap iii Maintain steady inward pressure on the special tool or coin so as to keep it fully engaged in the battery cap and rotate the battery cap through approximately 85 in a counter clockwise direction to remove cap see Figure 2 3 If a battery is already fitted the cap will normally release from the case under the action of the battery cap compression spring Note Do not attempt to rotate the cap beyond the design point approximately 85 degrees or beyond the point where the resistance of the end stop is felt Coin or special tool Contact Compression Plate A s Spring engt Tangs Underside of Battery Cap Figure 2 3 Battery Cap Removal iv Remove the existing battery if fitted Insert a new or replacement battery into the battery compartment as shown in Figure 2 4 Note The battery must be inserted anode first ISSUE 9 Page 10 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 GETTING STARTED 1 Insert Anode Inwards Figure 2 4 Inserting The EPD Battery v To fit the battery cap first locate it against the spe
108. the range of 49 0 mm to 51 0 mm 2 The diameter of the battery should be in the range of 13 9 mm to 14 6 mm 3 The diameter of the anode pip should be less than 5 7 mm The battery compartment has a feature to prevent reverse connection of the battery and an anode pip of more than 5 7mm diameter may fail to connect 4 Battery life may differ from specification Detailed procedures for inserting replacing the EPD are given in Section 2 1 2 Battery Leakage Batteries that become expended should not be left in the EPD as they may leak especially LTC batteries Batteries should also be removed from any EPD that is going to be left non operational for any length of time to avoid the possibility that leakage may occur and damage the EPD ISSUE 9 Thermo Scientific Page 87 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK MAINTENANCE 6 2 3 Page 88 Lithium Thionyl Chloride Battery Warning Lithium Thionyl Chloride LTC Sulphurous Oxychloride SOCl2 batteries are potentially dangerous and can be harmful The following warnings are to be observed when inserting replacing the EPD battery ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 MAINTENANCE NING Lithium Thionyl Chloride Batteries WAR 6 Lithium Thionyl Chloride battery contents are potentially toxic flammable and explosive Lithium Thiony Chloride batteries should not be short circuited or charged under any c
109. the unit has either been exposed to some kind of extreme interference or has developed a fault vi Abuse Warning The abuse warning indicates that an abuse alarm has been activated An abuse alarm is activated if mechanical knocks are detected continuously for greater than 15 seconds see Knock Time Seconds vii CRC Failure The CRC failure flag is set as a result of an integrity check on a set of data indicating that the EPD detected a checksum error in the dose data Checksum failures are corrected by retrieving the last stored dose from secure store EEPROM During the correction process up to 15 minutes of dose may be lost viii Low Voltage EPD software version 11 and later The EPD analogue circuitry detected a low supply voltage condition ix Detector Fault EPD software version 11 and later The EPD flash LED detector test failed Dose And Dose Rate Alarm Processing The EPD performs alarm processing as described in this section The occurrence of a dose or dose rate alarm is recorded by the following internal flags These flags make it easy for applications s w to determine over the IR communications link whether an alarm has occurred during an issue period The flags are therefore normally cleared over the IR communications link at the start of an issue period ISSUE9 Thermo Scientific Page 59 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK TECHNICAL DESCRIPTION Three Dose alarm flags indicate
110. their correct packaging Thermo Scientific ISSUE 9 Page 89 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK MAINTENANCE 6 2 4 Page 90 Replacing the EPD Battery The EPD is fitted with either a security type tamper proof battery cap or a coin release battery cap depending on customer requirements The security type battery cap helps to prevent unauthorised removal of the cap and requires a special tool see Section 2 Figure 2 2 During fitment of the battery cap the EPD will begin its initialisation sequence This is intentional and performs the function of EPD start up The procedure to replace insert an EPD battery is described in Section 2 1 2 The initialisation start up sequence is described in Section 2 1 3 ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 MAINTENANCE 6 3 EPD Clip Assembly Depending on customer requirements the EPD may or may not be fitted with a clip assembly The clip assembly comprises a lanyard plate and a spring clip which allows the user to attach the EPD to an outer garment see Section 2 1 6 The clip assembly is attached to the EPD by the lanyard plate The lanyard plate slots into a recess in the EPD case see Figure 6 1 Retaining lugs secure the lanyard plate in position ecess For Clip Assembly Lanyard Plate b Figure 6 1 EPD Case Clip Assembly Recess The lanyard plate may not be fitted with the spring clip again dependi
111. ther a security type tamper proof battery cap or a coin release battery cap depending on customer requirements see Figure 2 2 The security type battery cap restricts unauthorised removal of the cap and requires a special tool The coin type battery cap should be rotated using a small coin circa 20 mm diameter and 2 mm thick Conical Recesses Security type i Battery Cap De Special Tool For Security type Battery Cap A Coin Release Battery Cap Figure 2 2 Battery Cap Types and Special Tool The battery cap also provides the return path for the EPD s power supply Therefore during fitment of either type of battery cap the EPD will begin its start up sequence see Section 2 1 3 If the battery cap is not fitted cleanly and contact is temporarily broken the software initialisation process may not be successful Under these circumstances it is essential that the battery cap is removed and that a time interval of at least 10 seconds elapses before any attempt is made to refit the battery cap Inserting Replacing The EPD Battery Take care when removing the EPD battery cap the cap may spring free with unexpected force ISSUE 9 Thermo Scientific Page 9 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK GETTING STARTED To set up the EPD for operational use the battery must be inserted replaced in accordance with the following procedure i Read and observe the General Precautions and Instructions at
112. time to remove the EPD from the IR field The EPD continues to measure radiation during communication 4 5 2 EPD Configuration via the IR Communications Links Communication via the EPD s IR communications link will allow access to the following EPD functions and displays Default Display User Identification Dose and Dose Rate Alarms and Alarm Thresholds Counts Dose Quality Control of the EPD Status Scratch Pad Timed Events Dose Profile Special Total Dose Store ADS Issue Calibration Parameters o gt gt gt gt eH eH eH gt o o oH Access to these configuration parameters is restricted as follows 1 CALIBRATION FACTORS Write access to calibration parameters is prevented unless the EPD is configured by the manufacturer with calibration parameters unlocked default is locked If the calibration parameters are unlocked then suitable s w available through Thermo can adjust the gains of the EPD calibration within specified limits from the original manufacturer s calibration ISSUE 9 Page 52 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 TECHNICAL DESCRIPTION 2 PTB APPROVED EPD The Physikalisch Technische Bundesanstalt PTB Braunschweig and Berlin is the national institute of natural and engineering sciences and the highest technical authority for metrology and physical safety engineering of the Federal Republic of Germany EPDs supplied to Germany and elsewher
113. uSv to 16 777215 Sv Hp 0 07 1uSv to 16 777215 Sv It is not recommended to set dose rate alarms to less than 7uSv h Hp10 h or 100uSv h Hp 0 07 h as the statistical errors on the dose rate reading at these levels will be greater than 50 and false alarms may occur in normal background radiation conditions 4 6 9 Page 60 EPD Operating Status The EPD retains information regarding its status EPD status can only be read via the IR communications link Status information provided is EPD Run Times EPD State Alarms Warnings Faults o gt gt Event history ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 TECHNICAL DESCRIPTION EPD Run and Off times The EPD contains an accurate clock 30 ppm and records the elapsed time both for operating Run Time and in OFF Mode Times are recorded to a resolution of 1 second The OFF time is the number of seconds that the detectors have been switched off while the power has been present Note When power is removed or a reset occurs the EPD clock reverts to a value of up to 15 minutes prior to its value on power loss or reset EPD State The EPD retains a record of the following information 1 Issue Count This is the number of times the EPD has been issued 2 Issued This is the present state of the issued flag either EPD Issued or EPD Not Issued 3 Detectors State This is the current state of the EPD s operatin
114. ular construction and comprises an inner conductive liner an outer case assembly and lid The inner liner houses the EPD s electronic components The outer case consisting of a moulded front and back fits around the inner liner and is fused together to provide physical protection The lid which is fitted to the top of the outer case has a tight tolerance and is locked in place as an integral part of the EPD assembly The outer case and lid are designed not to come apart The complete assembly is engineered to house functional and operation components e g EPD battery LCD display button alarm LED alarm sounder IR communications link and beta window see Figure 2 1 Externally the outer case is contoured to receive and lock in place a clip assembly see Section 6 3 Essentially component replacement is limited to the EPD battery battery cap and clip assembly ISSUE 9 Page 48 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 TECHNICAL DESCRIPTION 28 5 with clip fitted 22 9 18 5 lanyard plate 66 5 63 5 O 86 0 Y Y eet D 1 125 Tis Soft Gamma Beta Hard Beta Compensation Detector Gamma Detector Detector All measurements are with respect to the Beta window 2 28 2 28 2 0 A SS Let l 11 0 VAN All measurements are in mm x m 14
115. unters Display b tn X 100 0 Enable Dose EnA Activate dose Factory Configured Dose On Accumulation accumulation Alarm Responder Only EnA Battery bAt Activate battery Battery voltage test 5 run 3 07 Time To T2AL Time to Alarm Aarm 99 59 v A HH MM Page 26 Figure 3 4 LCD Display Selections Additionally the OFF display can be configured to display hexadecimal numbers This feature is available from EPD firmware version 11 onwards ISSUE 9 Thermo Scientific ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 OPERATING INSTRUCTIONS This is for use by system software that sets a calibration date on the EPD display when in off mode The EPD default condition is to display OFF on the display when the detectors are off The value of 0 in this field causes the default OFF to be displayed Any other Hexadecimal value in this field will cause that value to be displayed instead of OFF This is to provide customers who wish to have a Calibration date displayed when the EPD is off to do so E g 2512 could mean calibrate on 25 December or 1225 could mean December 25 Take care when using this field as it could easily be mistaken for 4 digits of the Wearer ID It is unique in that it has the square block to the left of the first digit ane O n 42512 Time To Alarm The time to alarm value is HH MM to 1 minute resolution The value is 00 00 when the Hp10 1 Dose Alarm has occurred
116. unts respectively This display is intended for test purposes and may be useful for identification of faults or operational problems ISSUE 9 Thermo Scientific Page 41 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK OPERATING INSTRUCTIONS Page 42 3 5 12 Enable Dose Accumulation This display is ONLY available on EPDs that have been FACTORY configured as DoseOnAlarm Responder EPDs See section 1 1 1 Manufacturer Configurations for description of this feature Only one sub display is available EnA This mode is used to Enable the Hp 10 and Hp 0 07 dose accumulation Press the button once to select the display shown Gegen opposite Double press the button again and the display will flash Double press the button again to confirm the request The display will return to the default display The Hp 10 and Hp 0 07 dose accumulation is Enabled so that the Responder EPD will accumulate dose immediately and not wait for a dose rate alarm to occur 3 5 13 Battery Voltage Long press to navigate to the battery menu rt T C Single click to navigate to the run selection To run the test you need to double click which causes run to flash double click and the battery test is run The display then moves to the next selectable display which will be the battery voltage display if it is enabled From the run display single click to navigate to the Battery Voltage display which shows the
117. use ISSUE 9 Page 78 Thermo Scientific Services Module Text as displayed by EPD EasyEPD2 Action WEE 030 Service Module stCalData 99 ly os Soene stRateThres CRC faulty P een stDoseThres CRC faulty Service Module stDoseSummary CRC faulty 7 e stAdsData CRC faulty Timer Array overflow Timer Array overflow Timer Array overflow User I F Module ELECTRONIC PERSONAL DOSEMETER HANDBOOK EPD HB 40521 000 FAULTS AND RECOVERY ACTIONS Recommended Customer Action Reset unit Return to supplier if recurs Reset unit Return to supplier if recurs Reset unit Return to supplier if recurs Reset unit Return to supplier if recurs Reset unit Return to supplier if recurs Reset unit Return to supplier if recurs Reset unit Return to supplier if recurs Reset unit Return to supplier if recurs fault fault fault Code Text as displayed by EPD Recommended Remarks EasyEPD2 Action Customer Action Wee oo A AA A User Interface Module AIN A Reserved for future use Error Sounder Module Code Textas displayed by EPD Recommended Remarks EasyEPD2 Action Customer Action HA E T yO Sounder Module Error Reserved for future use ISSUE 9 Thermo Scientific Page 79 EPD HB 40521 000 FAULTS AND RECOVERY ACTIONS EEPROM Module Code Text as displayed by EPD Recommended Remarks EasyEPD2 Action Customer Action RE AA A o ee EEPROM no more spare i Return to su
118. v h Hp 10 h and 100uSv h Hp 0 07 h Alarm Types Audible and visual alarms for dose dose rate count down timer read time and failure mode Alarms are configurable via the IR communications link Tones High low tones loud quiet volume in seven combinations of continuous or fast slow intermittent Hp 10 Dose Chirp Settable from 0 01 uSv chirp to 100 uSv chirp Default Display The default display is initially factory preset to read Hp 10 the penetrating or deep dose or to an alternative default display as specified by the customer User selected displays have a time out period which can be set between 10 to 99 seconds This time out is the period of time that any display selected by the user will stay active before reverting to the default display The time out period may be adjusted via the IR communications link The default display can be changed to any of the displays shown in Figure 3 4 again via the IR communications link User Identification The EPD retains details relating to the current user and the number of times that the EPD has been issued Wearer details comprise the user s identification number i e the User ID and the User Name The User Name can be a string of up to 22 characters By convention an un issued EPD User ID is set to all F s FFFFFFFFFFFF Typically a User ID will have fewer than 12 digits but it must be an integer between 1 and 999999999999 A full description of User IDs is given
119. y ISSUE 9 Page 103 EPD HB 40521 000 ELECTRONIC PERSONAL DOSEMETER HANDBOOK APPENDIX C Feature Characteristic Drop 1 5m each face to concrete Environmental Communicat ions amp Internal Data Button Teledosimetry Temperature Humidity Sealing Vibration Memory Issue Return Incident assessment Dose Profile Sealed and recessed to prevent inadvertent operation Tactile with button beep facility sounder May be attached to Thermo teledosimetry adapter using clip attachment features 10 C to 50 storage 20 to 90 RH non condensing IP55 2g 15 min 10 33 Hz IR communication to front of unit range up to 1m May use standard IrDA adapters physical level 1 with Thermo supplied DLL and application s w as required EasyEPD2 Access Control s w etc operating 25 C to 70 Also provides IR communication to rear or unit for teledosimetry applications two way data transfer Large non volatile store for dosemeter control parameters dose data storage dose profile system scratchpad etc 10 year data retention Issue and return times of circa 1 second EPD communications time only Internal event amp alarm historical log 23 entries for time recording of alarms etc Peak dose rate recording Interval programmable from two seconds to 35 hours Stores Hp 10 and Hp 0 07 to a resolution of 1uSv Up to 579 records for transitions up to 127 uSv or less

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