^(134)Cs 796 keV符合修正因子与源半径和高度关系研究  

Study on Relationship Between ^(134)Cs 796 keV Coincidence Correction Factor and Source Radius and Height

作　　者：杜云武[1] 朱杰[1] 毕朝文 王亮[1] 罗茂丹 毛万冲[1] 朱小铰 DU Yunwu;ZHU Jie;BI Chaowen;WANG Liang;LUO Maodan;MAO Wanchong;ZHU Xiaojiao(Sichuan provincial radiation environment management and monitoring center station,Chengdu 610031,China)

机构地区：[1]四川省辐射环境管理监测中心站,成都610031

出　　处：《核电子学与探测技术》2024年第6期1112-1117,共6页Nuclear Electronics & Detection Technology

基　　金：四川省生态环境厅2022年度生态环境保护科研项目(2022HB17)资助。

摘　　要：为准确测量源^(134)Cs活度浓度,研究源^(134)Cs特征γ射线符合修正因子与源半径和高度关系。针对其796 keVγ射线,依据衰变纲图分解^(134)Cs衰变为三个过程,采用蒙特卡罗仿真30种不同半径和高度源^(134)Cs衰变过程,记录每个过程无符合计数和符合计数,开展源^(134)Csγ能谱特征峰和符合修正分析。研究表明:^(134)Csγ能谱796 keV特征峰由三个不同衰变过程决定,并且每个均有发生符合相加概率,源^(134)Cs 796 keVγ射线符合修正因子与源半径和高度为二元五次多项式关系,源高度对符合修正因子影响较大,源半径对符合修正因子影响相对较小。In order to accurately measure the activity concentration of source^(134)Cs,the relationship between theγ-ray coincidence correction factor of source^(134)Cs and the radius and height of source is studied.For its 796 keV gamma rays,the decay of^(134)Cs was decomposed into three processes according to the decay diagram.Monte Carlo simulation was used to simulate the decay processes of 30 kinds of^(134)Cs sources with different radius and heights,record the non-coincidence count and coincidence count of each process,and carry out the characteristic peak and coincidence correction analysis of the source^(134)Csγspectrum.The results show that the characteristic peak of^(134)Csγ796 keV is determined by three different decay processes,each of which has a coincidence summing probability.The relationship between the source^(134)Cs 796 keV gamma ray coincidence correction factor and the source radius and height is a binary quintic polynomial relationship,the source height has a greater influence on the coincidence correction factor,and the source radius has a relatively small influence on the coincidence correction factor.

关 键 词：源半径和高度 ^(134)Cs特征 γ能峰 符合修正 

分 类 号：TL99[核科学技术—核技术及应用]