无源效率刻度在马林杯状气体源活度测量中的应用

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...

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

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.