一种管道外非接触式气体活度浓度的探测方法研究  

The Study on A Non-contact Detection Method of Gas Activity Concentration Outside the Pipeline

作　　者：汪世军 郑国文[2] 张宇 雷强 张晶 蒋婧 庞洪超[2] 骆志平[2] 陈凌[2] WANG Shijun;ZHENG Guowen;ZHANG Yu;LEI Qiang;ZHANG Jing;JIANG Jing;PANG Hongchao;LUO Zhiping;CHEN Ling(Nuclear and Radiation Safety Center,Ministry of Ecology and Environment,Beijing 100084,China;China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]生态环境部核与辐射安全中心,北京100084 [2]中国原子能科学研究院,北京102413

出　　处：《核科学与工程》2023年第5期1034-1040,共7页Nuclear Science and Engineering

基　　金：大型先进压水堆及高温气冷堆核电站重大专项——CAP1400安全审评关键技术研究(2013ZX06002001-014)子课题14CAP1400放射性废物管理系统工艺监测研究。

摘　　要：核电厂运行期间向环境排放的放射性废气,是核电厂向环境排放放射性物质的主要途径。核电厂放射性废气处理过程中的工艺监测和流出物监测数据,是判断核电厂运行状况的重要依据。本文介绍一种基于NaI(Tl)探测器的管道外非接触式气体活度浓度探测方法,通过晶体尺寸设计和屏蔽室设计实现133Xe的管道外非接触式放射性废气的活度浓度测量,对于直径80 mm管道内气体的133Xe核素的最小可探测浓度为4.2×10^(5)Bq/m^(3),测量时间为30 s,废气中其他高能核素对测量的影响较小。The gaseous radioactive waste generated during the operation of nuclear power plants must be treated before it can be discharged into the environment.The treated gaseous effluent is the major path for nuclear power plants to discharge radioactive substances into the environment.The data of the process monitoring and effluent monitoring is important for judging the operation status of the system in the radioactive waste gas treatment process ofnuclear power plant. This paper introduces a non-contact gas activity concentration detectionmethod outside the pipeline based on the NaI(Tl) detector. The activity concentration measurementof 133Xe non-contact radioactive waste gas outside the pipeline is realized through the crystal sizedesign and the shielding design. The minimum detectable concentration of 133Xe nuclide in thegas inside the 80 mm diameter pipeline is 4.2×105 Bq/m3, the measurement time is 30 seconds,and other high-energy nuclides in the exhaust gas have little impact on the measurement.

关 键 词：非接触式探测 133Xe 活度浓度探测 

分 类 号：TL81[核科学技术—核技术及应用]