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1. Using the print feature directly from MAESTRO will result in getting a long list of numbers or using up the toner cartridge of the printer Instead use SAVE AS then save as an ASCII SPE file If you then double click on the file it will open a different application which plots the spectrum in a form that can be printed You can change things like log vs lin for the y axis once you are in this new application 4 Frequently Asked Questions Why do I not see a graph developing while I am taking data First you should check your scale in the toolbar Try switching from LOG to A and vice versa If you were first in LOG and have now switched over to A try zooming in on the bottom of the graph using the Zoom In and Zoom Out buttons that are also found on the toolbar second check that you have the right window on your screen There are two different windows the Buffer and the MCA instrument They are both located in a drop down menu on the right side of the toolbar on the same line with LOG and A Why 1s the GO button grey before I try to collect data You probably have your screen set to buffer instead of the MCA instrument To switch to the MCA simply click on the drop down menu at the right side of the toolbar and select MCA Why can I only select a one channel width ROI If you use the Mark ROI function from the toolbar the program will only highlight the region where your marker vertical line 1s To avoid this you can
2. for entering Real Live Time Overtlow 2 3 Interface Below is a brief description of the MAESTRO interface following a guide to shortcuts and the Display menu 2 3 1 Brief Description There are a total of five interfaces in the MAESTRO program The top interface is the toolbar menu It has standard options including saving files opening files printing and exit The Acquire drop menu has a link to the MCB properties that gives the user control over presets such as time and peak counts detailed information can be found in section 2 2 Real Live Time The Calculate menu contains links to programs that modify the data or analyze parts of the selected ROI The next menu is called ROI The list of options includes the Sum sums counts in ROI and Mark ROI marks the selected region as ROI The Services and Window menus are not used for our purposes The next interface the shortcut menu is right below the toolbar menu It includes the same options as the interface above but instead of drop down menus it has a few shortcut icons that represent the most frequently used options The main interface is in the center of the MAESTRO program In this window the user will observe the data input from the MCA The interface on the far right side informs the user of the date and the Real Live Time how long the program has been collecting The last interface 1s located of the bottom of the screen and shows the position of the marker in terms of channe
3. simply select your area right click inside the rectangle and choose the Mark ROI option from the menu
4. MAESTRO Multi Channel Analyzer Software Modification of the MAESTRO User Manual Designed for PHYS405 Undergraduates by Roberto Livi Edited by E Beise Jan 2007 Table of Contents Ts TOC UC HOI entes eoru UE MuR an og east a eor Na eite da onem tu a aaa A 2 JSODD UTE esten scenes tM Len Lr DU MI UD OU MODI LIU MEM 2 2 1 RESION Of Interes ROL aaesa cea piden 1o PE Foe RIO SEI Se To ORE FPeR RUIN 2 Zul SECCA e FOU cocer nobetEco EFE HE Rec cede Hobo DELE EEFEIUD Mor eue 2 3 ZR JBDECAH OD dista ix due obtu EUNT E tS DM M 2 Z Mee DAS n ereiaro E erences EEE TONTE EEE 2 2 1 4 Finding Peaks Net Area and Gross Area 3 DAV a Real WAT IS RETE 4 5 2 9 ATIC EA ENEE PE invoke sala eines a goad athe Seer aetna aa 5 6 S pie on MR TET I alae I A er 7 8 S1 Gamma Ray SpectroSCODy use beet esee doe EEe Unt esik nikri err net hae 7 3 2 Gamma Gamma Angular Correlation 00 cece cece cece cece cece eenes 8 4 brequenidly Asked QuesuOns creo E EET i ces ern IER INE AM 9 1 Introduction MAESTRO is a Windows based software program that analyzes detector signals from emitted photons from various radioactive sources The program controls the input to the Multi Channel Analyzer MCA a PCI Card that is mounted onto the motherboard of the computer Using the software with the MCA a user can collect multiple counts from a detector corresponding to emitted gamma rays photons and store them into exactly two t
5. Real Time enter the desired time length Enter the number zero in the box next to Live Time to exclude it Click Close Check under Preset Limits on the right side of the screen whether the information you have entered is correct Ae de S Hint If the information under Preset Limits is not correct try re entering your desired time but this time instead of entering a zero for the excluded field simply leave it blank The software is sometimes slow in updating this information so give it three to four seconds of time 2 2 2 Live Time 1 Repeat steps 1 and 2 from the Real Time Procedure 2 In the white box next to Live Time enter the desired time length 3 Enter the number zero in the box next to Real Time to exclude it 4 Click Close 5 Check under Preset Limits on the right side of the screen whether the information you have entered is correct A third way to set an automatic limit on how much data you want to acquire 1s the ROI Peak preset Select an ROI and then enter the number of counts desired in the white box next to ROI Peak This function can be used but it 1s suggested to only pick a Live Time value Figure 3 shows the Preset window in which you will be entering your data Properties for P405 08 MCB 25 ADC About Presets MDA Preset Uncertainty Heal Time Preset In 20 00 Live Time Start Chan 0 HUI Peak as width D ROI Integral Suggest Region Close Figure 3 Preset window
6. ark ROI Hint Once you have selected a rectangle do not click on the toolbar and select ROI Mark ROI This option will only highlight one single channel instead of the channels inside the rectangle 2 1 2 Calibration 1 Select ROI 2 Place the marker vertical line on the ROI 3 On the toolbar select Calculate Calibrate 4 Inthe field next to Calibration Energy enter the desired energy corresponding to the peak of the ROI 2 1 3 Counts 1 Select ROI 2 Right click on the ROI and select Sum 3 On the bottom of the window you should see a message appear as in Figure 1 below Marker X bb4 bb4 DD kev 19 934 Lnts HUI sum is 1 52147 e Utlb Figure 1 Message after summing channels in ROI There is also a second method of summing counts l 2 Using the left mouse button select a rectangle Right click on the inside of the rectangle and select Sum 2 1 4 Finding Peaks Net Area and Gross Area 1 Select ROI 2 Double click with the left mouse button on the ROI A new window will appear as you can see in Figure 2 Peak 653 63 653 63 keV FWHM 63 64 FVw 1 5 M 95 62 Gross Area 1520651 Met Area 1290734 2645 Grass Met Count Hate 5060 04 7 4302 45 cps Figure 2 Information regarding the selected ROI To find the Peak MAESTRO has an imbedded Gaussian fit function that produces a centroid and a Full Width at Half Max FWHM which can be manually converted into a standard deviation using the followi
7. h it appears corresponds to the 662 keV gamma ray The energy scale has to then be calibrated using other known sources The Gamma Gamma Angular Correlation measurement is an experiment used to analyze the rapid coincident emission of two gamma rays from a Cobalt 60 60Co nucleus In order to find their correlation in terms of a separating angle two Nal detectors are used in coincidence meaning that every time a photon with is detected by both instruments at the same time a signal is sent to the computer The signal sent to the computer is the sum of the two detector signals corresponding to the summed energy of the two gamma rays Below is a description of some of the basic functions of the MAESTRO software which would typically be useful in the above experiments Most MCAs have this type of functionality 2 Software 2 1 Region of Interest This function is used to highlight specific sections of the accumulated data Once the region 1s selected a user has the option to perform a calibration or find the peak the number of counts inside that region the net area and the gross area Below are instructions on how to perform these functions 2 1 1 Select a Region of Interest l 2 2 4 Press and hold the left mouse button on one end of the desired region Move the cursor over to the other side until your area is inside the rectangle Release the left mouse button and press the right mouse button inside the rectangle select M
8. housand forty eight channels or bins according to the signal pulse height In the apparatus in our labs the signal pulse height is proportional to the gamma ray energy Once the data are accumulated MAESTRO offers a variety of analytical tools to interpret the information This manual will focus on functions that will be useful for experiments involving gamma ray spectroscopy these functions include Region of Interest ROI Gaussian fits peak finders sum of counts and Calibration The MAESTRO software will be used for the following two experiments Gamma Ray Spectroscopy 7 and Gamma Gamma Angular Correlation 9 The following will be a brief description of both experiments and their main purpose The main objective of Experiment 7 1s to identify the emitted gamma rays from a variety of radioactive sources and given the known spectra calibrate the energy response of the detector One of the sources used is for example Cesium137 Cs137 for which the primary gamma emitted has an energy of 662 kilo electron Volts keV when not interacting with their surrounding elements In the experiment the source 1s placed in front of a Sodium Iodide detector at a given distance and the detector output is fed through a spectroscopy amplifier to create a voltage that 1s proportional to the gamma ray energy The MAESTRO software is then enabled to collect the voltage data into specific bins The user should then notice a peak appear and the channel in whic
9. ls Also if an area is selected the bottom window will also display the gross area net area and the sum of counts for that region 2 3 2 Display Menu Here 1s a list of useful displays that might aid the user for visual conceptions Viewing the data aS points Select Display Preferences Points With the ROI filled Select Display Preferences Fill ROI With everything filled Select Display Preferences Fill All 2 3 3 Shortcuts Recall this button opens an existing spectrum file a Save this shortcut saves the spectrum that is selected in the main interface tes A Scale clicking on either Log or A will change the y axis scale of your main interface Log is a logarithmic scale and A is the normal scale P Zoom In Out this option allows the user to zoom in and out of the main window This will only work when the normal scale A is selected If viewing your graph in Log clicking Zoom In Out will simply change the scale automatically X Mark ROI using this shortcut allows the user to highlight a ROI AE Clear ROI clears the ROI which is currently selected by the marker Maestro Na22 4 5 700 1 Long Chn cquire Calculate Services ROI Display Window K OGG five a HE eleje se SSC m Pulse Ht Analysis Buffer 3 Na22 4 5 700 1 Long Chn TER ut e 1 26 49 PM Thu 4 20 2006 Figure 4 MAESTRO Interface 3 Tips and Hints How do I print a copy of my spectrum
10. ng equation o FWHM 2 354 The Gross Area and the Net Area are derived by MAESTRO in the following manner B Background An Net Area Aag Adjusted Gross Area Ci Counts L High Limit ROI H Low Limit ROI The Gross Area Counts in our case is simply the counts inside the ROI MAESTRO on the other hand uses a correctional equation that adjusts the counts inside the ROI due to the uneven background For our purposes we do not need to know the details of this procedure The Net Area is then simply the adjusted Gross Area Counts minus the derived Background 2 2 Real Live Time Real Time and Live Time are presets that control the length of time of your data acquisition Real Time is a set interval based upon an active clock meaning that it will count time without any breaks Live Time on the other hand takes the effect of dead time into account Whenever a pulse is detected the detector needs a certain amount of time to process this information During this time gap the detector will not be able to reveal any other pulses or signals Thus to obtain a higher signal rate from your detector the MAESTRO software allows the user to avoid the dead time and maximize data collection for the selected time period Here is a guide on how to set up your desired real live time 2 2 1 Real Time From the top toolbar menu select Acquire MCB Properties On the tab menu in the new window click on Presets In the white box next to

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