低水平放射性惰性气体探测系统设计  

Design of Low Level Radioactive Noble Gas Detection System

作　　者：李建伟 邓长明 姚永刚 于潜 马慧敏 杜旭红 LI Jian-wei;DENG Chang-ming;YAO Yong-gang;YU Qian;MA Hui-min;DU Xu-hong(China Institute for Radiation Protection, Taiyuan 030006, China;China Institute of Atomic Energy, Beijing 102413, China)

机构地区：[1]中国辐射防护研究院 [2]中国原子能科学研究院

出　　处：《核电子学与探测技术》2018年第6期842-846,共5页Nuclear Electronics & Detection Technology

摘　　要：针对低浓度放射性惰性气体的监测需求,设计了一种探测限低、准确度高的用于放射性惰性气体连续监测的B-γ反符合探测系统。该系统将薄片塑料闪烁体和厚片塑料闪烁体组合起來构成β-γ反符合探测器,釆用铅进行屏蔽,并为其设计了专用的反符合电子线路,有效提高了放射性惰性气体测量装置的探测灵敏度。对探测系统的主要性能进行测试,测试结果表明:该系统探测限为4.6×10^3Bq/m^3,相对固有误差小于6.5%,指示值变化率小于10%。Aiming at the monitoring requirement of low concentration radioactive noble gas, a beta-gamma anti-coincidence detection system with low detection limit and high accuracy is designed for continuous monitoring of radioactive noble gas. The system combines thin film plastic scintillator with thick film plastic scintillator to form a beta-gamma anti-coincidence detector shielded by lead, and designed a special anti-coincidence electronic circuit for it, thus effectively improving the detection sensitivity of the radioactive noble gas measuring device. The main performance of the detection system is tested. The test results show that the detection limit of the system is 4.6×10^3 Bq/m^3, the relative inherent error is less than 6.5%, and the change rate of indication value is less than 10%.

关 键 词：低浓度 惰性气体 反符合:探测电路 探测下限 

分 类 号：TL812.1[核科学技术—核技术及应用]