强激光与粒子束, 2014, 26 (9): 094005, 网络出版: 2014-09-15
133Ba面源效率转移法刻度133Xe气体源HPGe探测效率
Efficiency calibration technology of 133Xe gas by efficiency transfer code of 133Ba disk source for HPGe detector
摘要
提出使用面源进行效率转移法刻度133Xe气体体源的探测效率。使用133Ba面源模拟刻度放射性133Xe气体体源的探测效率，在刻度的过程中利用137Cs与133Ba的峰效率比值及133Ba面源远端无符合相加效应，137Cs能峰远近都无符合相加效应等，结合软件模拟建立远近距离峰效率比值的关系，来解决133Ba的符合相加效应。最后，使用面源效率转移法进行气体体源效率刻度，转移法刻度结果和面源模拟法刻度计算值的偏差在±1％以内。
Abstract
An efficiency transfer code based on disk source is established to calibrate efficiency of 133Xe gas sample. 133Ba disk sources were used to simulate the detection efficiency of 133Xe cylindrical volume source. Relationships were established based on peak efficiency ratio between 137Cs and 133Ba. Cascade summing effects in close geometry gamma-ray spectrum of 133Ba was solved based on the ratios calculated by LabSOCS simulation and the experiment data of long and short distances. Finally, the efficiency transfer code is used to calibrate 133Xe gas sample’s efficiency. The detection efficiencies using the efficiency transfer code are consistent with the results of disk source simulation with discrepancy about ±1％.
田自宁, 欧阳晓平, 刘洋, 张小东, 刘林月, 张建福, 刘军, 阮金陆, 张忠兵, 曾鸣. 133Ba面源效率转移法刻度133Xe气体源HPGe探测效率[J]. 强激光与粒子束, 2014, 26(9): 094005. Tian Zining, Ouyang Xiaoping, Liu Yang, Zhang Xiaodong, Liu Linyue, Zhang Jianfu, Liu Jun, Ruan Jinlu, Zhang Zhongbing, Zeng Ming. Efficiency calibration technology of 133Xe gas by efficiency transfer code of 133Ba disk source for HPGe detector[J]. High Power Laser and Particle Beams, 2014, 26(9): 094005.
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