Parallel Plate Ionization Chambers
Contents
1. EXRADIN ION CHAMBERS Parallel Plate lonization Chambers 2 STANDARD IMAGING 3 User Manual 2 www STANDARD IMAGING 29 com EXRADIN ION CHAMBERS Parallel Plate lonization Chambers STANDARD IMAGING ING TEL 800 261 4446 3120 Deming Way TEL 608 831 0025 Middleton WI 53562 1461 FAX 608 831 2202 Nov 2012 2012 Standard Imaging Inc DOC 80332 09 General Precautions ee Warnings and Cautions alert users to dangerous con ditions that can occur if instructions in the manual are not obeyed Warnings are conditions that can cause injury to the operator while Cautions can cause dam age to the equipment WARNING Electrical shock hazard when connected to 300V bias supply WARNING Exradin lon Chambers are intended for quality assurance and calibration measurements They are not intended to be connected to a patient for real time dosimetry measurements VAN CAUTION Proper use of this device depends on careful reading of all instructions and labels CAUTION Do not drop mishandle or disassemble unit since it may result in change of calibration factor or damage Refer all servicing to qualified individuals VAN CAUTION Do not sharply bend triaxial cable Damage to the cable may result in high leakage currents CAUTION The A20 is designed for 70kV application and below without a build up cap CAUTION The A20 is not intended for water tank applications VAN CAUTION The A20 should only2. 0 mm from top of window 5 4mm 2 0 mm Polyimide film 3 86 mg cm A10 Shonka Air Equiv plastic C552 Wall thickness of 1 0 mm constructed of acrylic TG 51 compliant lt 1 Exradin 11 lon Chamber Pe A11 REF 92701 P11 REF 92703 T11 REF 92704 TYGON TUBING FOR VENTING WINDOW 0445 J GUARD b 028 6 aaa a a fa a STEM COLLECTOR ALL DIMS ARE APPROX AND IN MM SIDE VIEW Collecting Volume Nominal Calibration Factor Centroid of Collecting Volume Collector Diameter Window Collector Gap Window Window Support Rings Collec tor and Guard Material 0 62 cm 5 5 R nC 2 0 mm from top of window 20 0 mm 2 0 mm 1 0 mm A11 Shonka Air Equiv plastic C552 P11 Polystyrene Equiv plastic D400 T11 Shonka Tissue Equiv plastic A150 5 Exradin 11TW lon Chamber MSc A11TW REF 92708 P11TW REF 92709 T11TW REF 92710 TYGON TUBING WINDOW 044 5 GUARD 028 6 4 FOR VENTING STEM COLLECTOR ALL DIMS ARE APPROX AND IN MM SIDE VIEW Collecting Volume Nominal Calibration Factor Centroid of Collecting Volume Collector Diameter Window Collector Gap Window Window Support Rings Collector and Guard Material Included Waterproofing Cap 0 92 cm 3 4 R nC 1 5 mm from top of window 20 0 mm 3 0 mm Polyimide film 3 86 mg cm A11TW Shonka Air Equiv plastic C552 P11TW Polystyr
3. bottoms Waterproofing Cap A10 and 11TW ONLY The waterproofing cap available for these chambers is made of acrylic and has a 1 0 mm thick window as recom mended by the AAPM TG 51 protocol The O Ring inside the cap is designed to offer a snug fit to the chamber s outer diameter to ensure its seal To secure cap on chamber press cap firmly down onto chamber until it bottoms on chamber window ring Oc casionally the O Ring inside the cap will become twisted and prevent complete bottoming If this occurs simply rotate the cap either clockwise or counterclockwise while continuing downward pressure until it bottoms on chamber window ring To remove cap from chamber Gently rotate either clock wise or counterclockwise cap while pulling slightly upward Tygon is a trademark of Saint Gobain Performance Plastics Service Notes Continued km r s Kapton Window A10 11TW and A20 only The window is made of thin conducting Kapton film and is under tension Touching anything to the window is to be avoided Even though these T versions of Exradin lon Chambers are designed to be waterproof as a result of the hygro scopic properties of A150 they are not recommended for submerged use in water Submerged use typically involves ion chamber use with a water tank By definition the hygroscopic properties of A150 may cause the material to absorb minute amounts of water under certain conditions This water can alter the phys
4. Imaging Inc product or the Standard Imaging Inc web page for any warranty conditions unique to the product 12
5. ap 1 0 mm acrylic A11 Co 60 Calibration Cap 1 8 mm P11 Co 60 Calibration Cap 3 2 mm T11 Co 60 Calibration Cap 3 4 mm A11TW Co 60 Calibration Waterproof Cap 2 8 mm P11TW Co 60 Calibration Waterproof Cap 4 2 mm T11TW Co 60 Calibration Waterproof Cap 4 4 mm A20 70 100 keV Buildup Cap 15 4mg cm Polyimide A20 300 keV and above buildup cap 88 mg cm C552 Chamber Specifications Nominal Collection Efficiency 100 Maximum Polarizing Potential 1000 V Nominal Inherent Leakage Currents 1015 A Low Noise Triaxial Cable 50 ohms 29 pF ft 1 5 m long 2 5 m long for the A20 Signal Connector Triaxial BNC Plug 2 Lug Male unless requested as other High Voltage Connector Integral with triaxial connector shell of chamber is common with connector body Humidity 10 80 non condensing Temperature 15 50 C Pressure 680 770 mm Hg C 0413 Product Standards IEC 60601 1 IEC 60731 1 Designed to Meet Exradin A10 lon Chamber HE EEE A10 REF 92702 TYGON TUBING FOR VENTING STEM WINDOW 630 0 a GUARD 1 014 2 14 0 COLLECTOR ALL DIMS ARE APPROX AND IN MM SIDE VIEW Collecting Volume 0 051 cm Nominal Calibration Factor 60 R nC Centroid of Collecting Volume Collector Diameter Window Collector Gap Window Window Support Rings Collec tor and Guard Material Included Waterproofing Cap Polarity 1
6. be irradiated head on which is perpendicular to the window and is similar to other parallel plate ion chambers It should never be irradiated along its length CAUTION For best performance and when practical use ion chambers as calibrated matching the sign of the charge collected and the collecting electrode bias with that found on the calibration documents Measurements performed outside of the calibrated parameters and or manufacturer recommended specifications should be independently verified and used with care Table of Contents EEE PAGE i General Precautions 1 General Operation 3 Calibration 4 Parts and Accessories 4 General Chamber Specifications 5 Exradin A10 lon Chamber 5 Exradin 11 lon Chamber 6 Exradin 11TW lon Chamber 6 Exradin A20 lon Chamber 7 Service Notes 10 Service Policy 11 Customer Responsibility 12 Warranty WA STANDARDIMAGING 3 3120 DEMING WAY MIDDLETON WI 53562 1461 USA WWW STANDARDIMAGING COM This manual applies to the following parallel plate chamber models Model REF A10 92702 A11 92701 P11 92703 T11 92704 A11TW 92708 P11TW 92709 T11TW 92710 A20 92736 General Operation All Exradin parallel plate chambers are attached to a 1 5 m length of low noise flexible triaxial cable that is terminated by a triaxial or coaxial connector The collec tor of the chamber is common with the center wire of the cable and the center contact of the connector The guard is common with the in
7. chamber is disconnected from the elec trometer There is no water or moisture visible in the triax connector To clean a dirty triax connector Remove the connector cap if applicable Use only a dry and oil free compressed air source such as Chemtronics Ultra Jet Gently blow dirt and contaminants from the inside of the connector moving the air source in a circular manner a few inches from the connector After cleaning a dirty triax connector Use the connector cap when not in use if appli cable Do not Use sharp objects to attempt to clean a dirty triax connector Use a compressed gas other than air Use a compressed gas source that may have moisture or oil in the source or lines Use your mouth to blow on the connector Disassemble the connector Touch the internal parts of the connector with your finger If this procedure does not resolve the drift or leakage issues contact the Customer Service Administrator to coordinate the return the product to Standard Imaging for further service If there are any questions or comments regarding this information please contact Standard Imaging or your authorized dealer Service Policy iss If service including recalibration is required please contact Standard Imaging s Customer Service department by phone or email prior to shipping the product Standard Imaging s Customer Service and Technical Service staff will attempt to address the
8. ene Equiv plastic D400 T11TW Shonka Tissue Equiv plastic A150 Wall thickness of 1 0 mm constructed of acrylic TG 51 compliant Exradin A20 lon Chamber A20 REF 92736 GUARD r COLLECTOR 119 09 l 05 23mm 94 19 mm om Collecting Volume 0 074 cm3 Nominal Calibration Factor Centroid of Collecting Volume Collector Diameter Window Collector Gap Window Window Support Rings Collector and Guard Material 3 7 x 10 Gy C or 4 2 x 101 R C 1 80 mm from top of window 1 93 mm 5 0 mm Kapton film 7 72 mg cm Shonka Air Equiv plastic C552 Service Notes EE Stem The one piece polycarbonate stem 0 9 cm OD 7 6 cm long found on these chambers is an integral part of the chamber assembly and is not to be removed under any circumstances Venting These particular ionization cnambers are equipped with a Tygon tube secured to the chamber stem and running the full length of the triaxial cable The triaxial cable is inside the tubing The tubing is sealed to the chamber stem and is open to ambient conditions at the connector end This tubing is not intended to be removed or altered by the customer and doing so will void the warranty Calibration Cap Calibration caps constructed of the same material as the major elements of the chamber are available to provide more than adequate build up for Cobalt 60 radiation To secure cap on chamber Simply place cap over cham ber window until it
9. eral law in the U S A and Canadian law restrict the sale distribution or use of this product to by or on the order of a licensed medical practitioner The use of this product should be restricted to the supervision of a qualified medical physicist Measurement of high activity radioactive sources is potentially hazardous and should be performed by qualified personnel gt CAUTION As desired by IAEA English is the default language for labeling and manuals If translated versions are available resolve any differences in favor of the English versions WARNING Proper use of this device depends on careful reading of all instructions and labels gt gt WARNING Where applicable Standard Imaging products are designed to be used with the versions of common radiation delivery devices treatment planning systems and other products or systems used in the delivery of ionizing radiation available at the time the Standard Imaging product is released Standard Imaging does not assume responsibility liability and or warrant against problems with the use reliability safety or effectiveness that arise due to the evolution updates or changes to these products or systems in the future It is the responsibility of the customer or user to determine if the Standard Imaging product can be properly used with these products or systems Should repair or replacement of this product become necessary after the warranty period the customer s
10. hould seek advice from Standard Imaging Inc prior to such repair or replacement If this product is in need of repair it should not be used until all repairs have been made and the product is functioning properly and ready for use After repair the product may need to be calibrated The owner of this product has sole responsibility for any malfunction resulting from abuse improper use or maintenance or repair by anyone other than Standard Imaging Inc The information in this manual is subject to change without notice No part of this manual may be copied or reproduced in any form or by any means without prior written consent of Standard Imaging Inc 11 Warranty Standard Imaging Inc sells this product under the warranty herein set forth The warranty is extended only to the buyer purchasing the product directly from Standard Imaging Inc or as a new product from an authorized dealer or distributor of Standard Imaging Inc For a period provided in the table below from the date of original delivery to the purchaser or a distributor this Standard Imaging Inc product provided in the table is warranted against functional defects in design materials and workmanship provided it is properly operated under conditions of normal use and that repairs and replacements are made in accordance herewith The foregoing warranty shal not apply to normal wear and tear or if the product has been altered disassembled or repa
11. ical characteristics of the material to an extent which may cause the ion chamber s measurements and calibration factors to change over time Service and Maintenance There are no user serviceable parts within these ionization chambers Under no circumstance should the user attempt to repair or disassemble the chamber and or connector as the warranty will become void and the calibration factor will change Under normal use the chambers should provide years of trouble free service If assistance is desired in the proper disposal or recycling of this product including accessories and components after its useful life please return to Standard Imaging Service Notes Continued Cleaning Triax Connectors on lon Chambers and Extension Cables Over the years Standard Imaging has had product reports of drift or leakage involving its ion chambers Dur ing the investigation and or servicing of these products it became apparent a significant portion of these reports were caused by dirty triax connectors The cause is typi cally dust that has collected on the inside connector To minimize these reports and unnecessary service Standard Imaging is providing a triax connector clean ing procedure This triax connector cleaning proce dure should be periodically completed or whenever there are concerns of drift or leakage Heavier product use may require more frequent cleanings Prior to cleaning a triax connector ensure The ion
12. ired other than by Standard Imaging Inc or if the product has been subject o abuse misuse negligence or accident Product Warranty Period Standard Imaging lonization Chambers 2 years Standard Imaging Well Chambers 2years Standard Imaging Electrometers 5 years Standard Imaging BeamChecker Products 2 years Standard Imaging Software Products 1year All Other Standard Tvea Imaging Products y Standard Imaging Custom Products 1year Standard Imaging Remanufactured Products 180 days Standard Imaging Custom Select Products 90 days Consumables 90 days Serviced Product 90 days Resale Products As defined by the Original Equipment Manufacturer ADCL Product Calibration 0 90 days 100 of ADCL Calibration Costs Standard Imaging uses the 91 182 days 75 of ADCL Calibration Costs UW ADCL for recalibrations 183 365 days 50 of ADCL Calibration Costs required under warranty unless 366 639 days 25 of ADCL Calibration Costs otherwise requested days from date of shipment to customer Standard Imaging s sole and exclusive obligation and the purchaser s sole and exclusive remedy under the above warranties are at Standard Imaging s option imited to repairing replacing free of charge or revising labeling and manual content on a product 1 which contains a defect covered by the above warranties 2 which are reported to Standard Imaging Inc not later than se
13. l of the chamber 9 Insert the ion chamber and take at least 3 measure ments Generally the measurements should not be moving in only one direction i e three readings that continue to drop and hence may not yet be stabilized If a current measurement is done allow sufficient time for value to stabilize 10 Analyze the data taking into account the average of the readings system leakage temperature pressure corrections calibration factors and any other appro priate corrections to be made Keep in mind that the calibration factor consists of the electrometer calibra tion and the ionization chamber calibration factor 11 When all measurements are completed set bias volt age to 0 VDC turn off the electrometer and disconnect the ionization chamber Calibration As is standard practice for other ionization chambers it is recommended that Exradin chambers be calibrated every 2 years This calibration should be performed by an Accredited Dosimetry Calibration Laboratory ADCL Standard Imaging offers calibrations from the University of Wisconsin ADCL You need only one purchase order to cover calibrations shipping and handling and service Standard Imaging hand carries all instruments to and from the University of Wisconsin ADCL Parts and Accessories REF 72136 72137 72130 72131 72132 72133 72134 72135 72271 72272 General Description A10 Waterproof cap 1 0 mm acrylic Model 11 Waterproof c
14. ner cable braid and the middle con nector contact in the case of triaxial connectors and the connector body in the case of coaxial connectors The window outer electrode usually ground is common with the outer braid of the cable and the connector body in the case of triaxial connectors and the pigtail extending out the rear of coaxial connectors General Operation Continued HE see The design of Exradin chambers requires that the collector and guard operate at essentially the same potential The polarizing potential supplied by an electrometer is applied between the window and the guard as shown in Figure 1 Either polarity may be applied to the window and either the window or guard may be grounded Safety and other considerations recommend grounding the window which then requires an electrometer with a floating input All Exradin chambers can support 1000 V between window and guard However depending on the particular circum stance and radiation intensity as little as 90 V may yield essentially 100 charge collection WINDOW d COLLECTOR A I Ww 2 GUARD o lt E I ID E ELECTROMETER Figure 1 Parallel Plate Chamber and Electrometer Because Exradin ionization cnambers do not exhibit volt age soakage phenomena readings of ionization current may be made immediately after application of the polar izing potential However it is good p
15. product issue via phone or email If unable to address the issue a return material authorization RMA number will be issued With the RMA number the product can be returned to Standard Imaging It is the responsibility of the customer to properly package insure and ship the product with the RMA number clearly identified on the outside of the package The customer must immediately file a claim with their carrier for any shipping damage or lost shipments Return shipping and insurance is to be pre paid or billed to the customer and the customer may request a specific shipper Items found to be out of warranty are subject to a minimum service fee of 1 hour labor excluding recalibrations for diagnostic efforts and require a purchase order PO before service is performed With concurrence from customer the product may be replaced if it is unserviceable or if the required service is cost prohibitive Products incurring service charges may be held for payment Standard Imaging does not provide loaner products See the Standard Imaging Warranty and Customer Responsibility for additional information Return Policy _ _ No merchandise will be accepted for credit without prior approval of return Please contact Standard Imaging s Customer Service Department to receive a return authorization number before returning any merchandise for exchange or credit Products manufactured by Standard Imaging must be returned within thirt
16. ractice to pause a minute or two after changing the potential to allow switch ing transients induced in the electrometer to completely subside Such transients are most evident in the rate current mode Operating Instructions 1 With nothing connected to the input jack of the elec trometer turn the power on and wait at least 15 minutes for warm up 2 Verify the leakage of the electrometer is within the manufacturer s stated acceptable limits 3 Connect the ionization chamber to the electrometer and apply 300 VDC or the desired voltage bias 4 Allow the electrometer and ionization chamber system at least 10 minutes to stabilize making certain that all cabling is lying flat and unkinked General Operation Continued ET GEES 5 Verify the leakage of the ionization chamber is within the manufacturer s stated acceptable limits If mea sured in the presence of background sources note that this signal will add to the leakage of the chamber 6 Some electrometers such as the Standard Imaging MAX 4000 Electrometer allow the user to zero the device at any time If desired perform this system zeroing now 7 Check the system leakage Take a reading without exposing the chamber to radiation This reading should be less than 0 1 of the final signal expected If it is not the leakage should be subtracted from the signal 8 Measure atmospheric temperature and pressure For well chambers measure the temperature in the wel
17. ven 7 days after he expiration date of the warranty period in the table 3 which are returned to Standard Imaging Inc promptly after discovery of the defect and 4 which are found to be defective upon examination by Standard Imaging Inc Transportation related charges including but not limited to shipping customs tariffs taxes and brokerage fees to Standard Imaging are the buyer s responsibility This warranty extends to every part of the product excluding consumables fuses batteries or glass breakage or material reactions Standard Imaging Inc shall not be otherwise liable for any damages including but not limited to incidental damages consequential damages or special damages Repaired or replaced products are warranted for the balance of the original warranty period or at least 90 days This warranty is in lieu of all other warranties express or implied whether statutory or otherwise including any implied warranty of fitness for a particular purpose In no event shall Standard Imaging Inc be liable for any incidental or consequential damages resulting from the use misuse or abuse of the product or caused by any defect failure malfunction or material reactions of the product whether a claim of such damages is based upon the warranty contract negligence or otherwise This warranty represents the current standard warranty of Standard Imaging Inc Please refer to the labeling or instruction manual of your Standard
18. y days of receipt of order in like new condition No credit will be given for products returned after thirty days from receipt of order A minimum twenty percent restocking fee will be charged on all returned merchandise All materials returned must be shipped pre paid Credit for returned goods will be issued to customer s account for use against future purchases of merchandise only Special orders custom products re sale not manufactured by Standard Imaging products and ADCL calibrations will not be accepted for return credit or exchange Serialization Information Standard Imaging products that are serial ized contain coded logic in the serial number which indicates the product day and year of manufacture and a sequential unit number for identification AYY DDD X A Unique product ID YY Last two digits of the year e g 1999 99 2000 00 DDD Day of the year 1 lt DDD lt 365 X Unique unit ID Number 1 lt X lt 9 10 Customer Responsibility PPP This product and its components will perform properly and reliably only when operated and maintained in accordance with the instructions contained in this manual and accompanying labels A defective device should not be used Parts which may be broken or missing or are clearly worn distorted or contaminated should be replaced immediately with genuine replacement parts manufactured by or made available from Standard Imaging Inc CAUTION Fed
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