无源效率刻度在马林杯状气体源活度测量中的应用  

Application of sourceless efficiency calibration in activity measurement of gas source in Marinelli beaker

作　　者：王硕[1] 杨宝路 周强[1] 李则书 李文红[1] 张京[1] 拓飞[1] WANG Shuo;YANG Baolu;ZHOU Qiang;LI Zeshu;LI Wenhong;ZHANG Jing;TUO Fei(Key Laboratory of Radiological Protection and Nuclear Emergency,China CDC,National Institute for Radiological Protection,Chinese Center for Disease Control and Prevention,Beijing 100088 China)

机构地区：[1]中国疾病预防控制中心辐射防护与核安全医学所,辐射防护与核应急中国疾病预防控制中心重点实验室,北京100088

出　　处：《中国辐射卫生》2022年第1期6-12,共7页Chinese Journal of Radiological Health

摘　　要：目的利用LabSOCS无源效率刻度软件模拟优化马林杯状源盒,探究HPGe探测器测量惰性气体的探测效率,为核电站惰性气体流出物的测量优化提供参考。方法利用LabSOCS软件建立了马林杯模型,探究各惰性气体γ射线的探测效率随气体成分、气体密度、马林杯尺寸参数、马林杯体积、测量源盒形状的变化关系。结果气体成分对马林杯中惰性气体的探测效率几乎没有影响,低能γ射线的探测效率受气体密度影响较大,选择合适的马林杯高度和半径能够使HPGe探测器获得更好的测量结果。对于BE5030 HPGe探测器,不同体积的马林杯探测效率最高值均位于半径/高度=0.7位置处,并给出不同体积的马林杯高度和半径的最优值。结论选择合适的马林杯尺寸能够提高核电站流出物中惰性气体的探测效率。Objective To optimize the Marinelli beaker with the simulation of Laboratory Sourceless Object Calibration Software(LabSOCS),to investigate the detection efficiency of HPGe detector in measuring noble gas,and to provide a reference for the measurement and optimization of noble gas effluent from nuclear power plants.Methods LabSOCS was used to establish a Marinelli beaker model to investigate the relationship of gamma ray detection efficiency of noble gas with gas components,gas density,size and volume of the Marinelli beaker,and the shape of source container.Results The gas components had little effect on the detection efficiency of the noble gas in the Marinelli beaker.The gas density had a relatively great effect on the detection efficiency of low-energy gamma ray.The Marinelli beaker of appropriate height and radius enabled the HPGe detector to get better measurement results.For the BE5030 HPGe detector,the highest detection efficiency of the Marinelli beakers of different volumes were observed at the location where the radius/height ratio was 0.7,and the optimal values of height and radius were given for the Marinelli beakers of different volumes.Conclusion Choosing Marinelli beaker of the appropriate size can improve the detection efficiency of noble gas in the effluent from nuclear power plants.

关 键 词：马林杯 无源效率刻度 LabSOCS Γ能谱测量 惰性气体 

分 类 号：R144[医药卫生—公共卫生与预防医学]