β-γ符合系统β探测器能量和能量分辨率刻度  

Energy and Resolution Calibration of β Detector for β-γ Coincidence System

作　　者：李奇[1] 王世联[1] 赵允刚[1] 贾怀茂[1] 樊元庆[1] 张新军[1] LI Qi;WANG Shi-lian;ZHAO Yun-gang;JIA Huai-mao;FAN Yuan-qing;ZHANG Xin-jun(CTBT Beijing National Data Centre and Beijing Radionuclide Laboratory,Beijing 100085,China)

机构地区：[1]禁核试北京国家数据中心和北京放射性核素实验室,北京100085

出　　处：《现代应用物理》2021年第4期33-38,共6页Modern Applied Physics

基　　金：国家自然科学基金资助项目(11975109)。

摘　　要：β-γ符合测量技术是一种高灵敏度氙同位素活度测量方法,β探测器能量和能量分辨率刻度是β-γ符合法准确测量氙同位素活度的关键。针对缺少能覆盖氙同位素β射线能区发射单能电子的气体核素问题,利用^(137)Cs康普顿电子对β-γ符合系统β探测器能量和能量分辨率进行刻度,并通过^(131m)Xe 129.4 keV内转换电子验证了刻度的准确性。根据刻度结果及氙同位素β-γ符合关系,实现了氙同位素β射线能窗准确划分,为氙同位素活度准确测量奠定了基础。β-γcoincidence measurement method is a highly sensitive radioxenon isotopes detection technique.The energy and resolution calibration ofβdetector are key to accurately measure radioxenon isotopes.The detector energy and energy resolution in theβ-γcoincidence system are calibrated by ^(137) Cs Compton electron,and the accuracy of the calibration is verified by ^(131m) Xe 129.4 keV internal conversion electron.Theβenergy windows ofβ-particles(or conversion electron)for ^(131m) Xe,^(133m) Xe,^(133)Xe and ^(135) Xe are obtained according their cascade coincidence relationship and the results of energy and resolution calibration,which provide a foundation of accurate measurement of radioxenon isotopes by usingβ-γcoincidence system.

关 键 词：放射性氙同位素 能量和能量分辨率 β-γ符合系统 

分 类 号：TL816[核科学技术—核技术及应用]