133＾Ba面源效率转移法刻度133＾Xe气体源HPGe探测效率  

Efficiency calibration technology of ^(133)Xe gas by efficiency transfer code of ^(133)Ba disk source for HPGe detector

作　　者：田自宁[1,2] 欧阳晓平[1,2,3] 刘洋[3] 张小东[2] 刘林月[2] 张建福[2] 刘军[2] 阮金陆 张忠兵[2] 曾鸣[1] 

机构地区：[1]清华大学工程物理系,粒子技术与辐射成像教育部重点实验室,北京100084 [2]西北核技术研究所,西安710024 [3]华北电力大学核科学与工程学院,北京102206

出　　处：《强激光与粒子束》2014年第9期244-249,共6页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(11275154,11105106,11275150,11175142)

摘　　要：提出使用面源进行效率转移法刻度133 Xe气体体源的探测效率。使用133 Ba面源模拟刻度放射性133 Xe气体体源的探测效率,在刻度的过程中利用137 Cs与133Ba的峰效率比值及133 Ba面源远端无符合相加效应,137 Cs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133 Ba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。An efficiency transfer code based on disk source is established to calibrate efficiency of 133 Xe gas sample.133 Ba disk sources were used to simulate the detection efficiency of 133 Xe cylindrical volume source.Relationships were established based on peak efficiency ratio between 137 Cs and 133 Ba.Cascade summing effects in close geometry gamma-ray spectrum of 133 Ba 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 133 Xe 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%.

关 键 词：面源 LabSOCS 效率刻度 

分 类 号：TL814[核科学技术—核技术及应用]