点源空间效率函数法层析γ扫描无源效率刻度  

Sourceless Efficiency Calibration of Tomographic Gamma Scanning with Point Source Space Efficiency Method

作　　者：郑洪龙 庹先国 苟家元[1] 吴耀 左伟[1] 郭雨非 何庆驹 宋纪高 阳林锋[1] 刘伟[1] ZHENG Hong-long;TUO Xian-guo;GOUJia-yuan;WU Yao;ZUO Wei;GUO Yu-fei;HE qing-ju;SONG Ji-gao;YANG Lin-feng;LIU Wei(Sichuan Engineering Laboratoryfor Nuclear Facilities Decommissioning and Radwaste Management,Nuclear Power Institute of China,Chengdu 610213,China;KeyLaboratoryof Higher Educationof Sichuan Province for Enterprise Informationalization and Internet of Things,Sichuan Universityof Science&Engineering,Zigong Sichuan643000,China)

机构地区：[1]中国核动力研究设计院四川省核设施退役与放射性废物治理工程实验室,成都610213 [2]四川轻化工大学企业信息化与物联网测控技术四川省高校重点实验室,四川自贡643000

出　　处：《核电子学与探测技术》2021年第1期24-29,共6页Nuclear Electronics & Detection Technology

基　　金：国家自然科学基金(41874213、41604154)资助。

摘　　要：介绍了基于点源空间效率函数的层析γ扫描(TGS)无源效率刻度方法。利用TGS系统MCNP模型计算探测空间120cm×60cm×50cm和γ能量0.01-1.408MeV的点源空间效率,建立点源空间效率函数及参数,采用体素中心点源效率等效法,实现体素效率矩阵计算。结果表明:5种γ能量在探测空间507个位置处的效率测量值和函数计算值具有较高相关性,说明该方法能够准确、快捷地实现TGS体素无源效率刻度。A sourceless efficiency calibration method with point source space efficiency function in TGS is presented.The MCNP model of TGS detection system is constructed to calculate point source space efficiencies with space of 120 cm×60 cm×50 cm and energy of 0.01-1.408 MeV.Combined with the point source space efficiency function model,parameters of function are determined.The point source efficiency in center of voxel is calculated as the equivalent of voxel efficiency.Result shows that the calculated efficiencies are good agreement with that of measurement for five energies in 507 spatial points.This method accurately and fast achieves TGS efficiency calibration.

关 键 词：核废物桶 层析γ扫描 效率刻度 MC模拟 函数 

分 类 号：TL814[核科学技术—核技术及应用]