General Counting Procedure
Contents
1. 7 5 3 Coarse calibration and initial electronic settings essere 8 3 29 cBnergey Calibration aoc eoe ea eec ra de eie D000 ai A a a ae 9 54 Efficiency Calbrati n ee aaa az fassen isset aaa 10 5 5 Final Calibration Verification secet o oet ace Get atelier 00 oe 10 5 6 ADPTOValS a ea a d a d a i aaa de te la 10 OF VRE GOR DS 6 ciii DR OOo a 10 7 ATTACIHMENIS FORMS ataca ia aaa de ana a a eb eR dp d old ca a 11 7 1 Attachment 1 Gamma Spectroscopy calibration report eee nana eee 12 January 18 2006 SLAC I 760 2A39C 009 R 002 Page 5 Gamma Spectroscopy Calibration Procedure 1 PURPOSE This procedure provides guidance for calibrating Gamma spectroscopy systems Although there are several gamma spectroscopy systems used by the Radioanalysis Laboratory Rad Lab this procedure is applicable to High purity Germanium HPGe detectors and its associated electronics Other gamma spectroscopy systems ie Sodium lodide SAM may need additional instructions for operation Please refer to their respective manuals for additional information 2 REFERENCES 2 1 GammaVision 32 Software User s Manual 2 2 ORTEC Solid State Photon Detector Operators Manual 2 3 Gamma Spectroscopy Analysis Procedure SLAC I 760 2A39C 009 3 RESPONSIBILITIES 3 1 Rad Lab Operator The Rad Lab Operator assigned to perform activities descri2. Cover Plastic Gamma Ray Nuclide Half life Branching Activity Gammas Total Energy keV s Ratio Ci per second Uncert 60 Am 241 432 17 0 66 years 36 0 0 07293 971 4 3 1 96 88 Cd 109 462 6 0 7 days 3 63 0 7193 966 1 3 1 96 122 Co 57 271 79 0 09 days 85 6 0 02814 891 3 3 1 96 159 Te 123m 119 7 0 1 days 84 0 0 03515 1092 3 1 96 320 Cr 51 27 706 0 007 days 9 86 0 9024 3292 3 0 96 392 Sn 113 115 09 0 04 days 64 9 0 1405 3374 3 0 514 Sr 85 64 849 0 004 days 98 4 0 1687 6142 3 0 36 662 Cs 137 30 17 0 16 years 85 1 0 1132 3564 3 0 96 898 Y 88 106 630 x 0 025 days 94 0 0 2758 9592 3 0 96 1173 Co 60 5 272 x 0 001 years 99 86 0 1417 5236 3 0 36 1333 Co 60 5 272 0 001 years 99 98 0 1417 5242 3 0 1836 Y 88 106 630 0 025 days 99 4 0 2758 10140 3 0 Method of Calibration This source was prepared from weighed aliquots of solutions whose concentrations in uCi g were determined by gamma spectrometry Notes See reverse side for leak test s performed on this source IPL participates in a NIST measurement assurance program to establish and maintain implicit traceability for a number of nuclides based on the blind assay and later NIST certification of Standard Reference Materials as in NRC Regulatory Guide 4 15 Nuclear data was taken from IAEA TECDOC 61 9 1991 Overall uncertainty is calculated at the 99 confidence level This source has a working life of 1 year ate IPL Ref No 1199 87 150 900
3. PNAN L Approved by C pe oo Spectrum File Name tel Sae NEW Sol 206 Spe Count Time 6242 Seconds Energy Calibration Filename CA Spe NEW Soil 2006 Ent Efficiency Calibration Filename Cd Spec NGEN Soil 2006 66 Calibration Filename Nym 20068 lb Final Verification Count Pass Fail Section 4 Approvals ns i Signature Date Signature Date Version 1 061113 Page 2 of 3 January 18 2006 SLAC I 760 2A39C 009 R 002 Page 13 Gamma Spectroscopy Calibration Procedure Gamma Spectroscopy Calibration Form Section 5 Attachments Attachment 1 Source Standard Certificate s Attachment 2 Efficiency Energy Calibration Printout Attachment 3 Verification Report Version 1 061113 Page 3 of 3 January 18 2006 SLAC I 760 2A39C 009 R 002 Page 14 Gamma Spectroscopy Calibration Procedure Ec 24937 Av Tibbi e Isotope Products Vn CM SI en Laboratories Tel 661 309 1010 An Eckert amp Ziegler Company Fax 661 257 8303 CERTIFICATE OF CALIBRATION MULTINUCLIDE STANDARD SOURCE Customer STANFORD LINEAR ACCELERATOR CENTER Source No 1199 87 3 P O No 64518 Reference Date 1 Sep 06 12 00 PST Catalog No EG ML Contained Radioactivity 2 508 pCi 96 13 kBq Physical Description A Capsule type 500mL Nalgene bottle B Nature of active deposit Multinuclide distributed in 1 7 g cc sand matrix C Active diameter volume Approximately 250mL 425 8 grams D Backing Plastic E
4. 1 Attachment 1 Gamma Spectroscopy calibration report January 18 2006 SLAC I 760 2A39C 009 R 002 Page 11 Gamma Spectroscopy Calibration Procedure 7 1 Attachment 1 Gamma Spectroscopy calibration report Gamma Spectroscopy Calibration Form For instructions see the Gamma Spectroscopy Calibration Procedure SLAC I 760 2A39C 009 Section 1 System Information A Calibration Date oe fe B System Type Laboratory C Portable O Other C Detector Serial Number 24 TN ZOUJA Pre am S N wet D Detector Type P type N Type E Electronics o DSPEC B NimBin O Other Section 2 Pre Calibration A Source Standard Information Mixed Gamma Matrix O Epoxy Soil O Other Matrix Volume Weight 425 8 geen l Serial Number 1 193 87 3 Certificate Date 2 1 00 expires Ft e7 B Equipment check Cable Insulation siis Fail Cable Connections ci Pass D Fail Corrosion d Pass L1 Fail Filter X Cooler Pass O Fail C QA Check Background E Pass O Fail Total Activity Pass Fail Peak Shift Pass O Fail Av FWHM Ratio Pass O Fail D Electronic Adjustment Needed O Yes ms Version 1 061113 Page 1 of 3 January 18 2006 SLAC I 760 2A39C 009 R 002 Page 12 Gamma Spectroscopy Calibration Procedure Gamma Spectroscopy Calibration Form Section 3 System Settings A Electronic Settings Energy Channel Ratio Conversion Gain B Software Settings Performed by C
5. area deconvoluted This section based on library Newsoilcal Lib ORTEC g v i 1087 wan32 G53w2 06 15 NOV 2006 15 23 31 Eo 3 Stanford Linear Accelerator Ce Spectrum name Cal Spec NEW Soil 2006 An1 deese sede de de dee dede eee IDENTIFIED PEAK SUMMAR Y Nuclide Peak Centroid Background Net Area Intensity Uncert FWHM Channel Energy Counts Counts Cts Sec 2 Sigma kev eee ee eee ee eee AM 241 119 35 59 44 175938 140274 22 120 1 24 1 443s CD 109 176 44 88 02 198715 163103 25 720 1 14 1 439s 0 57 244 60 122 14 175462 s 23 394 1 18 1 486s Page January 18 2006 SLAC I 760 2A39C 009 R 002 Page 18 Gamma Spectroscopy Calibration Procedure Cal Spec NEW Soil 2006 A 148804 23 Te 123 318 38 159 08 185017 gt 465 1 24 1 529s CR 51 640 29 320 23 122243 160850 25 364 1 02 1 6545 SN 113 783 33 391 83 96203 270470 42 650 0 61 1 706s Sr 85 1027 61 514 10 88081 357233 56 332 0 49 1 806s CS 137 31322 65 661 77 77062 259256 40 882 0 61 1 888s Y 88 1794 84 898 07 55696 437092 68 925 0 39 2 100s Co 60 2344 65 1173 18 31766 245080 38 646 0 53 2 213s co 60 2663 11 1332 50 26203 208294 32 846 0 49 2 341D Y 88 3669 94 1836 12 9202 292013 46 047 0 40 2 649s s Peak fails shape tests D Peak area deconvoluted A Derived peak area eddie SUMMARY OF LIBRARY S PEAK USAGE mei Nuclide Average Peak Name Code Activity Energy Activity Code MDA value micr
6. for activity calculation had bad shape Activity omitted from total Activity omitted from total and all peaks had bad shape MDA value printed Activity printed but activity lt MDA Activity lt MDA and failed test Area lt Critical level Failed fraction or key line test Halflife limit exceeded SUMMARY Total Activity 49 8 to 2001 2 2 0158813E 00 uci Total Decayed Activity 49 8 to 2001 2 kev 2 7184112E 00 uci Analyzed by O N D NH Supervisor INADPA 65 8 y Vui ae Reviewed by Laboratory Stanford Linear Accelerator Center Page 4 January 18 2006 SLAC I 760 2A39C 009 R 002 Page 20
7. reviewers RM Murat Kerimbaev Radiological Environmental Protection Group Date Date October 16 2006 SLAC I 760 2A39C 011 R 001 Page 2 DISTRIBUTION LIST To be filled out by Document Author or person requesting document deletion Once approved the new or revised document or the notice of deleted document s should be distributed to all persons identified below All RP staff members X All holders of the following manual s SLAC Radioanalysis Laboratory Procedures The following individuals October 16 2006 SLAC I 760 2A39C 01 I R 001 Page 3 TABLE OF REVISIONS REVISION DATE SECTION S REASON FOR REVISION 001 October 16 All Additional instructions for 2006 calibrating HPGe Gamma Spectroscopy systems October 16 2006 SLAC I 760 2A39C 01 I R 001 Page 4 Gamma Spectroscopy Calibration Procedure TABLE OF CONTENTS 1 PURPOSE ei ceia ada eat sei dna da d aa dute a nud aede 2 pita i ial aaa cat 6 2 WREPERENGES cetei 6 3 RESPONSIBILITIES cecene odata da caen pda cnc 6 3 1 Rad Lab Operatofoc asesinado Motte tutes Secs suis a td i tu it a balls ta 6 3 URED Manager cal da dal a du utto ditate 6 4 PREREQUISITES iniit EUNTES 7 5 ia dl EEN 7 5 1 Pr Calibration P
8. 1 CERTIFIED Quality Control Medical imaging Laboratory industrial Gauaina Laboratorv January 18 2006 SLAC I 760 2A39C 009 R 002 Page 15 Gamma Spectroscopy Calibration Procedure Calibration Data from file Energy Calibration Date NimCalSoil2006B Clb 5 24 2006 Time 1 05 20 PM Efficiency Calibration Date 5 24 2006 Time 1 09 35 PM Calibration Description Calibration of NimBin HPGe Detector with IPL Epoxy source SN 104 6 67 2 Standard counted for 12027 sec with bottle on detector Energy Calibration Fit 0 3324 0 500640 Channel 1 00434e 007 Channel 2 Energy FWHM keV Energy FWHM Table 2 5409 0 000888 Channel 1 42471e 008 Channel 2 Channel Energy keV Fit keV Delta FWHM Fit Delta 119 55 59 54 59 52 0 04 1 36 1 33 2 27 176 44 88 03 88 00 0 04 1 37 2 35 1 16 244 42 122 07 122 03 0 03 1 35 1 38 1 97 332 02 165 85 165 88 0 02 1 39 1 42 1 92 783 27 391 69 391 74 0 01 1 57 1 62 2 85 1322 91 661 66 661 79 0 02 1 93 1 85 4 46 1794 99 898 02 897 99 0 00 2 04 2 05 0 49 2345 16 1173 24 1173 19 0 00 2 20 12 27 0 11 2663 50 1332 50 1332 41 0 01 2 36 2 40 1 77 3670 81 1836 01 1836 07 0 00 2 82 2 80 0 51 Efficiency Calibration Fit Polynomial Uncertainty 2 9459 Coefficients 0 551778 4 121626 0 130861 0 051441 0 004501 0 000117 Efficiency Table Energy Efficiency Fit Delta 59 24 2 1362E 002 2 1356E 002 0 03 87 78 2 5483E 002 2 5550E 002 0 26 121
9. 82 2 3538E 002 2 3406E 002 0 56 391 61 1 1724E 002 1 2199E 002 4 05 661 34 1 1152E 002 1 0237E 002 8 20 1173 12 7 5126E 003 7 8611E 003 4 64 1332 16 6 9797E 003 7 2425E 003 3 76 1835 66 5 7528E 003 5 5651E 003 3 26 Calibration Certificate Table Isotope Energy Pct Halflife Activity GPS Error Date amp Time Am 241 59 24 36 30 1 58E 005 2640 22 958 40 3 10 5 15 2004 12 00 00 PM Cd 109 87 78 3 61 4 63E 002 38393 35 1386 00 3 00 5 15 2004 12 00 00 PM Co 57 121 82 85 60 2 72E 002 1370 33 1173 00 3 00 5 15 2004 12 00 00 PM Sn 113 391 61 64 16 1 15E 002 6851 62 4396 00 3 00 5 15 2004 12 00 00 PM Cs 137 661 34 85 21 1 10E 004 5971 13 5088 00 3 00 5 15 2004 12 00 00 PM Co 60 1173 12 299 90 1 93E 003 7230 23 7223 00 3 00 5 15 2004 12 00 00 PM Co 60 1332 16 299 98 1 93E 003 7233 30 7232 00 3 00 5 15 2004 12 00 00 PM Y 88 1835 66 99 35 1 07E 002 13749 37 13660 00 3 00 5 15 2004 12 00 00 PM January 18 2006 SLAC I 760 2A39C 009 R 002 Page 16 Gamma Spectroscopy Calibration Procedure Cal Spec NEW Soil 2006 G53w2 06 15 Nov 2006 15 23 31 Pa ORTEC g v i 1087 wan32 ge 1 Cal Spec NEW Soil 2006 An1 Stanford Linear Accelerator Ce Spectrum name Sample description New Soil Standard Calibration File Spectrum Filename C User Cal Spec NEW Soil 2006 An1 Acquisition information Start time pi 9et 2006 14 23 07 Live time 63 Real time 6734 Dead time 5 83 Detector ID 1 Detector system MATC 122 Calibration Filen
10. ROUTING SHEET Document Title GAMMA SPECTROSCOPY CALIBRATION PROCEDURE RP SLAC 760 2A39C 011 Revisioni 001 5 o The following action s is are requested to the attached document 0 Review and approve this completely new document X Review and approve changes to this revised document Delete this document Revise or update this document Each reviewer will have 10 working day s to complete this task The reviewer shall return this attached document with comments to the original requestor author or to the next available reviewer The last reviewer return to requestor author at Name Henry Brogonia Mail stop 84 Date Date pa YES REVIEWER NAME GROUP Received Completed X Jim Allan Field Operations alee E NM Wg 9t James Liu DREP Group Leader lO e o amp 6 96 Henry Tran Dosimetry u Jie oc D ES amp H DIVISION RADIATION PROTECTION RP DEPT SLAC I 760 2A39C 011 R 001 GAMMA SPECTROSCOPY CALIBRATION PROCEDURE RP Dept Document RE 012 Stanford Linear Accelerator Center October 16 2006 SLAC I 760 2A39C 011 R 001 Page 1 SIGNATURE LIST Document Author Henry Brogonia Owner Group REP Adoption of new or X revised document or document deletion reviewed and approved by Owner Group Leader lra rd 8 06 James Liu Radidjogical Environmental Protection Group Date Reviewed and approved by other
11. ame Calibration of NimBin HPGe Detector with IPL Soil source NewNimCalSoi12006 Clb rd counted for 6341 sec with bottle on detector Energy Calibration Created zero offset Gain Quadratic Efficiency Calibration Created Type Uncertainty Coefficients Library Files Main analysis library Library Match width Peak stripping Analysis parameters Analysis engine Start channel Sto Pea channel rejection level Peak search sensitivity Sample Size Activity scaling factor Detection limit method Random error Systematic error Fraction Limit Background width Standa 05 Oct 2006 07 47 25 0 315 kev 0 501 kev channel 7 285E 08 kev channel 2 05 Oct 2006 07 52 11 Polynomial 2 203 0 272752 4 963240 0 489552 0 067023 0 004115 0 000097 NewSoilcal Lib 0 500 Library based G53w2 06 100 49 75kev 4000 2001 19kev 1 0000E 00 1 0000E 00 1 0000E 00 1 0000E 00 Currie limit 1 0000000E 00 1 0000000E 00 0 000 average of three points wan32 1 0000E 00 Page 1 January 18 2006 SLAC I 760 2A39C 009 R 002 Page 17 Gamma Spectroscopy Calibration Procedure Cal Spec NEW Soil 2006 ORTEC g v i 1087 wan32 G53W2 06 15 2006 15 23 31 Page 2 Stanford Linear Accelerator Ce Spectrum name Cal Spec NEW Soil 2006 An1 Half lives decay limit 12 000 Activity range factor 2 000 Min step backg energy 0 000 Corrections Status Comm
12. bed in this chapter is responsible for e ensuring that prerequisites are met as required e reporting any problems or unexpected events to the Radiological Environmental Protection REP Manager e providing the calibration data to the REP Manager for analysis approval and e Performing other duties assigned by the REP Manager 3 2 REP Manager The REP Manager is responsible for e ensuring that the activities in this chapter are conducted in accordance with this written procedure e assigning the tasks in this procedure to a qualified Operator and January 18 2006 SLAC I 760 2A39C 009 R 002 Page 6 Gamma Spectroscopy Calibration Procedure 4 1 4 2 4 3 4 4 4 5 e providing final approval or disapproval of all data and submittals PREREQUISITES Must be familiar with Windows operating menus Must have a basic understanding of Gamma Spectroscopy theory Must be familiar with general electronic equipment NIMBins Amplifiers HV Power supplies oscilloscopes Must be familiar with general laboratory equipment pipettes scales etc Must have experience with the Gammavision software 5 PROCEDURES 5 1 Pre Calibration Obtain a copy of the HPGe Calibration Form and fill out sections 1A through 1E A copy of the form is located on the V drive under the following path V ESH OHP DREP RAD LAB HPGe Gammavision Shortcuts HPGE Calibration Form doc Obtain the source standard to be used for calibra
13. ents Decay correct to date YES 01 Sep 2006 12 00 00 Decay during acquisition NO Decay during collection NO True coincidence correction NO Peaked background correction NO Absorption Internal NO Geometry correction NO Random summing NO Energy Calibration Normalized diff 1 0000 dese se de de dede de ee de UN ID ENTI ESI ED PEA K S UMMA R Y desee defe dede dede de de x Peak Centroid Background Net Area Intensity Uncert FWHM Suspected Channel Energy Counts Counts Cts sec 2 Sigma X kev Nuclide 145 54 72 53 101649 2044 0 322 44 34 1 421 BI 207 D 149 97 74 75 114676 4187 0 660 23 09 1 423 TL 208 D 273 25 136 48 113514 16058 2 532 7 24 1 449 CO 57 372 81 186 33 103318 2170 0 342 50 04 2 505 PA 234 S 510 49 255 25 94950 11147 1 758 10 02 1 571 SN 113 5 1252 63 626 72 32766 662 0 104 95 04 0 769 w 187 s 1489 75 745 39 20095 503 0 079 92 47 1 073 AG 110M s 1626 57 813 99 23082 4383 0 691 10 26 1 996 2 132 D 1823 34 912 33 25965 854 0 135 69 26 1 593 AC 228 s 2068 01 1034 76 21352 576 0 091 95 37 0 510 58 126 5 2291 49 1146 26 9522 319 0 050 87 34 2 223 TE 131 D 2646 80 1324 62 14033 7001 1 104 5 35 2 336 KR 89 D 2840 27 1421 13 10590 406 0 064 95 36 1 483 5 2917 50 1459 76 10631 490 0 077 77 31 1 071 AC 228 5 2987 27 1494 66 10532 445 0 070 82 66 0 957 AC 228 s 3394 18 1698 63 5532 260 0 041 82 01 2 557 PA 234 D 3700 06 1851 19 3777 539 0 085 46 41 2 642 XE 138 Peak fails shape tests Peak
14. er its corresponding energy as listed on the standard certificate For instance enter 1173 keV for the Co 60 peak near channel 2364 Repeat for all energy peaks of the standard An energy curve should develop as all the points are entered Make sure the energy curve is linear and that all points are within 1 of the curve If a point does not fall within 1 of the line remove it Once the energy curve is established save the file and note the filename on the calibration form 3B Refer to Gammavision software manual for specific details on performing an energy calibration January 18 2006 SLAC I 760 2A39C 009 R 002 Page 9 Gamma Spectroscopy Calibration Procedure 5 4 Efficiency Calibration Using spectrum used for energy calibration open the efficiency calibration section of the software Enter the corresponding activities for each peak as listed on the standard certificate Remove any points that do not fall within 596 of the calibration curve Verify that the general shape of the curve is similar to the efficiency curve of the last calibration Save the efficiency calibration and note the file name on the calibration form 3B Refer to the Gammavision software manual for specific details on performing an efficiency calibration 5 5 Final Calibration Verification Once the Energy and Efficiency calibrations are performed save the final calibration and note its filename This is done by selecting Calibrate and Save Calibration und
15. er the Gammavision top menu Print a calibration record by selecting Calibration and Print Calibration and attach to the calibration report Perform a count as described in the Gamma Spectroscopy Analysis procedure SLAC I 760 2A39C 009 Use the same source standard used in the calibration Verify that the energies and activities reported in the analysis are the same as the standard certificate Note the results in section 3B of the form The calibration performed is only good for the same sample matrix and size Additional calibrations may need to be performed for other samples The Rad Lab currently runs a 500ml liquid calibration and a 250ml soil calibration For each additional calibration only the energy and efficiency calibrations need to be performed 5 6 Approvals Once the entire calibration process is complete sign the form under section 4 and obtain approvals 6 RECORDS 6 1 All calibration results generated from this procedure should be entered into a calibration report and submitted to the REP manager for approval 6 2 All hardcopies of the Analysis reports generated from this procedure including the calibration report standard certificate and calibration printout should also be provided and stored in the Rad Lab archives An electronic copy should also be stored in the REP Rad Lab V Drive January 18 2006 SLAC I 760 2A39C 009 R 002 Page 10 Gamma Spectroscopy Calibration Procedure 7 ATTACHMENTS FORMS 7
16. nother count until the Co 60 peaks are defined Adjust the fine gain until the Co 60 peaks are within corresponding channels 2346 and 2664 If necessary the zero offset setting may be adjusted until the peaks line up The fine calibration may take several iterations before the desired settings are reached Once the settings are satisfactory remove the Co 60 source and note the fine gain and zero offset Section 3A on the form Proceed to Section 5 5 of this procedure to perform the energy calibration 5 5 Energy Calibration Obtain a certified multinuclide source standard The source standard should represent a matrix similar to Rad Lab samples and have several nuclides with gamma energy peaks between 0 2000 keV Verify by certificate that these nuclides are still present within the standard If there are not enough peaks to represent the 0 2000 keV range another source standard must be obtained Attach any standard certificates used in the calibrations to the calibration report Place the standard on the detector and initiate a counting process until the peaks are well defined and have good statistics A good rule of thumb is to make sure to have at least 10 000 counts for each peak Depending on the activities in the source standard this may take hours or a few days Save the spectrum Note the count time and spectrum file name on the form under section 3B Open the energy calibration section of the software highlight each peak and ent
17. nuary 18 2006 SLAC I 760 2A39C 009 R 002 Page 19 Gamma Spectroscopy Calibration Procedure Cal Spec NEW Soil 2006 P Peakbackground subtraction Peak is too close to another for the activity to be found directly Nuclide Codes Peak Codes T Thermal Neutron Activation G Gamma Ray F Fast Neutron Activation X Ray Fission Product Positron Decay Naturally Occurring Isotope Single Escape Photon Reaction Double Escape Charged Particle Reaction Key Line No MDA Calculation Not in Average Coincidence Corrected Coincidence Peak Halflife limit exceeded O AZzOuvvux NCC TO EXEOUuZH t bv ep t SERRE SUMMARY OF NUCL IDE S IN SAMPLE Time of Count Time Corrected Uncertainty 2 Sigma Nuclide Activity Activity Counting Total uci uci uci uci CD 109 7 4138E 01 7 7907E 01 8 8520E 03 3 7213E 02 CO 57 2 8603E 02 3 1123E 02 3 6637 04 1 4439E 03 co 60 1 4212 01 1 4383 01 7 6047E 04 5 0000E 03 CS 137 1 2188E 01 1 2213 01 7 4886E 04 4 3600E 03 sr 85 1 2301E 01 1 7522bE 01 8 5157E 04 6 0801E 03 SN 113 1 1894E 01 1 4518bE 01 8 7957E 04 7 1969E 03 Y 88 2 2777E 01 2 8245E 01 7 9308E 04 9 7843E 03 Te 123 3 0723E 02 3 7214E 02 4 6332E 04 1 7331E 03 CR 51 4 0387E 01 9 2460E 01 9 4116E 03 4 2546E 02 AM 241 7 7582E 02 7 7594E 02 9 6195E 04 3 6125E 03 ORTEC g v i 1087 wan32 G53W2 06 15 Nov 2006 15 23 31 Page 5 Stanford Linear Accelerator Ce Spectrum name Cal Spec NEW Soil 2006 An1 All peaks
18. oci kev microci microci Comments CD 109 7 4138 01 88 03 7 414E 01 3 333 03 G CO 57 2 8603E 02 122 07 2 860E 02 1 329E 04 G co 60 1 4212E 01 1173 24 1 421 01 Q 1 700E 04 G 1332 50 1 312 01 5 016E 04 G CS 137 1 2188E 01 661 66 1 219E 01 2 147 04 G sr 85 1 2301E 01 514 00 1 230E 01 1 681 04 G SN 113 1 1894 01 391 69 1 189 01 2 244E 04 G Y 88 2 2777E 01 1836 01 2 309 01 1 248 04 G 898 02 2 245 01 1 994E 04 G Te 123 3 0723E 02 159 00 3 072E 02 1 461E 04 G CR 51 4 0387E 01 320 07 4 039E 01 1 444E 03 G D ORTEC g v 1 1087 wan32 G53W2 06 15 2006 15 23 31 Page 4 Stanford Linear Accelerator Ce Spectrum name Cal Spec NEW Soil 2006 An1 Nuclide Ave activity Energy Activity Code Peak MDA Comments AM 241 7 7582E 02 59 54 7 758E 02 3 816E 04 G C This peak used in the nuclide activity average peak is too wide but only one peak in library Peak is part of a multiplet and this area went negative during deconvolution Peak is too narrow Peak is too wide at FW25M but ok at FWHM Peak fails sensitivity test Peak identified but first peak of this nuclide failed one or more qualification tests Peak activity higher than counting uncertainty range Peak activity lower than counting uncertainty range Peak outside analysis energy range Calculated peak centroid is not close enough to the library energy centroid for positive identification Page 3 ARAN gi i Ja
19. ote the previous electronic settings and also copy them as the new settings on the form Section 3A Proceed to section 5 5 of this procedure to perform the energy calibration If the QA check indicates a need for electronic adjustment make sure that the electronic settings have not changed since the last calibration Retrieve the latest calibration report and assure that the electronic settings such as gain shaping time and ADC conversion are all intact Depending on the system the electronic settings must be changed through the Gammavision software or through the hardware unit NimBin NOMAD etc If the electronic settings do not match restore the original settings Rerun the QA check View the QA status page If the system fails under the settings from the last calibration fill out section 2C on the form Note the previous settings in section 3A of the form and continue to section 5 3 of this procedure to perform the coarse calibrations If the system passes under the old electronic settings fill out sections 2C of the form Note the previous settings in section 3A of the form copy them as the new settings and skip to section 5 5 of this procedure to perform the energy calibration 5 3 Coarse calibration and initial electronic settings Note the Polarity shaping time and High Voltage on the form Section 3A Unless you are setting up a new system or different detector electronics configuration these parameters should never change bet
20. tion and a copy of its certificate The standard used for calibration should have a valid certificate date and be NIST National Institute of Standards and Technology traceable Fill out section 2A Note the calibration standard and the standard used for the QA check may be different Inspect all the cables and their connections for any signs of damage corrosion at the connections crumbling insulation etc Also check the filter on the X Cooler Replace any missing or damaged parts Fill out section 2B As part of the instrument quality control process a QA check should be performed daily when the Gamma Spectroscopy system is in use A daily QA check will allow the analyst to detect any drift within the system as well as well as assist in pinpointing any problems the system may have Perform a QA check as described in the Gamma Spectroscopy Analysis procedure SLAC I 760 2A39C 009 Verify that all the peaks fall within 2 eV of the corresponding energies and the activities listed on the source check report should also fall within 10 of the listed activities on the certificate This is verified under the QA Status page The status page will January 18 2006 SLAC I 760 2A39C 009 R 002 Page 7 Gamma Spectroscopy Calibration Procedure indicate an o k next to each QA parameter if it falls within satisfactory limits If the system is operating within the limits then no electronic adjustment is needed Fill out section 2C N
21. ween calibrations The previous and new settings should be the same Consult the REP manager or the vendor when setting up a new system or detector configuration The energy to channel ratio must be determined prior to starting the coarse calibration The Rad Lab currently uses a 1 2 energy channel ratio meaning that each channel number should be twice as its corresponding energy in keV For instance a 511 keV peak should fall under channel 1022 The calibration procedure is also written using this ratio Note If an energy channel ratio is chosen other than 1 2 the channels referenced in this procedure will not apply For ratios other than 1 2 refer to the detector manual for information on calibrating the system Place a Cobalt 60 Co 60 source on the detector and initiate the counting process Continue counting until the Co 60 peaks are defined Adjust the coarse gain until the two Co 60 peaks fall within a 1 5 channels of the corresponding energies 1173 and 1332 keV The peak energies do not have to exactly match the corresponding channels but make sure that the channel separation between the peaks is 318 channels Once this is complete note January 18 2006 SLAC I 760 2A39C 009 R 002 Page 8 Gamma Spectroscopy Calibration Procedure the coarse gain and conversion gain on the form Section 3A Proceed to section 5 4 of this procedure to perform the Fine Calibration 5 4 Fine Calibration Reset the counting display Initiate a
Download Pdf Manuals
Related Search