NaI(Tl)探测器工作性能的蒙卡模拟  

Monte Carlo Simulation of NaI(Tl)Detector Performance

作　　者：彭坤涛 杨羽超 钟浩威 邓鸿亮 邢吉胜 PENG Kuntao;YANG Yuchao;ZHONG Haowei;DENG Hongliang;XING Jisheng(East China University of Technology,Nanchang 330013,China)

机构地区：[1]东华理工大学,南昌330013

出　　处：《能源研究与管理》2023年第1期184-190,共7页Energy Research and Management

基　　金：中国铀业&核资源与环境国家重点实验室联合创新基金(NRE2021-03)。

摘　　要：通道式车辆放射性检测站所用的NaI(Tl)探测器在投入使用前,需要了解探测器在设定工作范围内的性能表现。直接测量费时费力且易受实验条件的限制。为了能快速获知探测器在复杂环境下的工作性能,基于NaI(Tl)探测器的尺寸参数建立蒙卡模型,模拟探测器对不同放射源的γ能谱。对比高斯扩展后的模拟谱与实测谱后发现两者特征峰基本拟合,验证了蒙卡模型的准确性。当源距增大时,模拟谱与实测谱的吻合情况依旧良好,表明模拟结果能够反映NaI(Tl)探测器对于不同能量与源距情况的能谱表现,证明了以蒙特卡罗模拟作为探测器性能参考的可行性。It is necessary to know the performance of the detector in the set working range,before the NaI(Tl)detector used in the radioactivity detection station of the passageway vehicle is put into use.Direct measurement is laborious and restricted by experimental conditions easily.In order to quickly know the working performance of the detector in complex environment,a Monte Carlo model was established based on the size parameters of NaI(Tl)detector to simulate the gamma energy spectrum of different radioactive sources.Comparing the simulated gamma spectrum after gaussian expansion with the experimental gamma spectrum,it was found that the two full-energy peaks were basically fitted,which proved the accuracy of the Monte Carlo model.When the source distance increased,the simulated spectrum and the measured spectrum were still in good agreement,indicating that the simulate results can reflect the NaI(Tl)detector performance for different energy and source distance conditions,and proving the feasibility of using the Monte Carlo simulation as a performance reference.

关 键 词：NAI(TL)探测器 蒙特卡罗模拟 能量刻度 高斯展宽 

分 类 号：TL81[核科学技术—核技术及应用]