β-γ 符合的低本底放射性氙测量技术研究  

Research on Low Background Radioxenon Detection Technology Base onβ-γCoincidence

作　　者：肖思敏 郭庐阵[1] 李兴隆[1] 骆志平[1] 庞洪超[1] 刘阳[1] 吴建华[1] 袁国军[1] 黄晓鹏 XIAO Simin;GUO Luzhen;LI Xinglong;LUO Zhiping;PANG Hongchao;LIU Yangyagn;WU Jianhua;YUAN Guojun;HUANG Xiaopeng(China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]中国原子能科学研究院,北京102413

出　　处：《核电子学与探测技术》2024年第4期680-687,共8页Nuclear Electronics & Detection Technology

摘　　要：研制了一套高灵敏度气体氙放射性同位素探测装置,配合前端化学处理单元,实现对大气中的氙放射性同位素的自动监测。系统采用β-γ复合测量技术,降低了本底,并基于双高纯锗探测器(HPGe)和钝化离子注入平面硅气体探测盒(PIPSBOX),设计夹心式HPGe/PIPSBOX/HPGe探测器结构,提高了系统的探测效率。研究使用点源对HPGe探测器和PIPSBOX探测器能量、分辨率刻度,并使用体源结合Geant4模拟对探测器的探测效率进行刻度。最终预期对133Xe核素的最小可检测活度浓度(MDC)约为0.178 mBq/m^(3)。A high efficiency radioxenon isotopes detector,combined with sampling unit and processing unit,to achieve automatic monitoring of radioxenon isotopes in the atmosphere has been developed in this study.The system usesβ-γcoincidence detection technology to reduce the background count rate.Based on dual high-purity germanium detectors and PIPSBOX detectors,a sandwich type HPGe/PPSBOX/HPGe detector structure is designed to improve the detection efficiency of the detector.The point sources are used to calibrate the energy and resolution of the high-purity detector and the PIPSBOX detector.The detection efficiency of the detector is calibrated by using volume source combined with Geant4 simulation.The final expected minimum detection activity concentration(MDC)of 133Xe is about 0.178 mBq/m^(3).

关 键 词：β-γ符合 探测器刻度 氙放射性同位素 低本底 

分 类 号：TL814[核科学技术—核技术及应用]