| ZHANG Fu-li,QU De-cheng,YANG Guo-shan,ZHENG Ming-min.An efficiency calibration method without a radioactive source using BOMAB phantom and Monte Carlo simulation for Inspector 2000 gamma spectroscopy system[J].Chinese Journal of Radiological Medicine and Protection,2009,29(4):432-434,448 |
| An efficiency calibration method without a radioactive source using BOMAB phantom and Monte Carlo simulation for Inspector 2000 gamma spectroscopy system |
| Received:April 24, 2009 |
| DOI： |
| KeyWords:Monte Carlo simulation Portable gamma spectroscopy system Efficiency calibration without a radioactive source |
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| Abstract:: |
| Objective To establish an efficiency calibration method without a radioactive source for Inspector 2000 gamma spectroscopy system. Methods At the first step, geometry parameters of the detector were properly specified by comparisons of FEPE (Full Energy Peak Efficiency) between Monte Carlo(MC) calculations and the average measured values of HPGe and NaI detectors using point sources(137Cs). The differences between calculations and measurements were generally within±10% for gamma rays. Then,Monte Carlo simulation was used to evaluate the counting efficiency of NaI(Tl) and HPGe detectors for BOMAB phantoms. Corresponding efficiency curves and functions were fitted. Results The counting efficiency received from the fitted efficiency functions had a good agreement with those from MC simulation. The bias for NaI detector ranged from -19% to 18%, while the bias for HPGe detector ranged from -11% to 17%. The above errors were totally acceptable in the on-site deployment during nuclear and radiological emergency events. ConclusionsMonte Carlo method is simple,time and laborsaving in determing the counting efficiency of gamma spectroscopy system. |
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