微量放射性核素^(60)Co高灵敏探测报警系统设计  

Design of High Sensitive Detection and Alarm System for Trace Radionuclide^(60)Co

作　　者：李建伟 张向阳[1] 何高魁[1] 刘国荣[1] 刘洋[1] 田华阳[1] LI Jian-wei;ZHANG Xiang-yang;HE Gao-kui;LIU Guo-rong;LIU Yang;TIAN Hua-yang(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》2021年第6期959-965,共7页Nuclear Electronics & Detection Technology

基　　金：国家重点研发计划项目(2017YFC0820800)。

摘　　要：本课题建立了一种针对被检物品内添加的微量^(60)Co示踪标记物进行快速、精确探测及报警的方法。通过MCNP模拟计算、本底估算等方法优化设计探测器结构,利用物理屏蔽和天然本底扣除技术降低探测系统测量时间、探测限和判断限,利用总计数阈值报警和能量窗口阈值报警相结合的方法降低探测系统的误报率及漏报率。实验结果表明,模拟计算和本底估算结果与系统实测结果基本一致,所设计系统完全满足设计需求。A method of fast and accurate detection and alarm for the constant^(60)Co tracer added to the inspected articles is established.The detector structure is optimized designed by MCNP simulation calculation and background estimation.The measurement time,detection limit and judgment limit of the detection system are reduced by using the physical shielding and the natural background subtraction technology.The false alarm rate and Leakage alarm rate of the detection system are reduced by combining the total count threshold alarm with the energy window threshold alarm.The experimental results show that the simulation calculation and background estimation results are basically consistent with the actual measured results,and the designed system fully meets the design requirements.

关 键 词：微量^(60)Co 塑料闪烁体 高灵敏探测 天然本底扣除 能量窗口法 

分 类 号：TL81[核科学技术—核技术及应用] TP277[自动化与计算机技术—检测技术与自动化装置]