激光三维扫描γ谱仪无源效率刻度  

Passive Efficiency Calibration Method Based on Laser 3D Scanning Modeling

作　　者：万永亮 刘俊丰 铁列克 杨蓉 牛顺利 成智威 WAN Yong-lang;LIU Jun-feng;TIE Lie-ke;YANG Rong;NIU Shun-li;CHENG Zhi-wei(Urumqi Customs,Urumqi 830063,China;Beijing Zhongzhi Nuclear Security Technology Co Ltd,Beijing 100094,China)

机构地区：[1]乌鲁木齐海关技术中心,乌鲁木齐830063 [2]北京中智核安科技有限公司,北京100094

出　　处：《核电子学与探测技术》2022年第4期712-716,共5页Nuclear Electronics & Detection Technology

基　　金：新疆维吾尔自治区重点研发计划项目(2019B00002)资助。

摘　　要：为解决非规则几何体样品的γ放射性活度测量的效率刻度问题,探讨了一种无源效率刻度新方法。该方法通过激光三维扫描建立测量对象的几何模型,利用点源对HPGe探测器进行表征获得探测器的关键参数如晶体尺寸。将几何模型离散成许多立方网格体,利用数值积分方法计算效率刻度因子。研发的无源效率刻度软件(LSCalib)配合表征过的γ能谱仪,可实现对复杂几何形状体源的放射性活度测量。测试结果表明,该方法能够适用于不规则几何体样品的效率刻度因子计算。In order to solve the problem of efficiency calibration in the activity measurement of irregular geometric gamma radiation samples,a new method of passive efficiency calibration for gamma detectors is discussed.This method establishes the geometric model of the measurement object by laser 3D scanning.Using point sources,the High Purity Germaniumdetector was characterized.And key parameterssuch as crystal size can be obtained.The geometric model was dispersed into a lot of small cubes.The numerical integration method is used to calculate the efficiency scale factor of the gamma detector.The software(LSCalib)cooperated with characteristic gamma spectrometer realizes the activity measurement of the gamma-ray source of any shape.The testing result shows that this method can be used to calculate efficiency calibration factor of irregular geometric gamma radiation samples.

关 键 词：γ放射性活度 无源效率刻度方法 激光三维扫描 效率刻度因子 数值积分 

分 类 号：TL817.2[核科学技术—核技术及应用]