γ射线闪烁体探测器响应函数模型研究  

Study on Response Function Model forγ-ray Scintillation Detector

作　　者：李哲[1] 张译文[1] 孙世峰[1] 王宝义[1] 魏龙[1,2] 

机构地区：[1]中国科学院高能物理研究所核辐射与核能技术重点实验室,北京100049 [2]北京市射线成像技术与装备工程技术研究中心,北京100049

出　　处：《原子能科学技术》2015年第8期1354-1358,共5页Atomic Energy Science and Technology

基　　金：国家重大科学仪器设备开发专项资助(2011YQ120096);中国科学院创新项目资助(KJCX2-EW-N06);中国博士后科学基金资助项目(2014M560119)

摘　　要：建立了一种可用于γ射线能谱分析的CsI（Tl）闪烁体探测器响应函数（DRF）模型,并对0.05--1.5 MeVγ射线能谱进行了拟合。描述γ射线能谱特征的每个函数均是基于对射线作用机制的分析,采用权重最小二乘法实现了22 Na、60 Co、137 Cs、238Pu实验能谱的拟合,并同时得到了函数中与射线能量相关的非线性参数。最后利用该DRF模型对CsI（Tl）探测器测量152 Eu源的γ射线能谱进行了拟合,结果表明,此DRF模型可较好地应用于γ射线能谱的分析。The detector response function （DRF） model of scintillation over the range of incident γ-ray energy from 0.05 MeV to 1.5 MeV was established and applied to fit radiation source spectra. Each function for describing the feature of ）,-ray spectra is based on the analysis of fundamental interaction mechanism. These functions were combined to form a DRF model to fit 22Na, 60C0, 137Cs, 238pu experiment spectra by weighted least square fitting method, and nonlinear parameters in this model were obtained simultaneously which are dependent on the source energy. The validity of DRF model was demonstrated by fitting 152Eu spectra measured by CsI（T1） detector. The result shows that this model is useful to analyze γ-ray spectrum.

关 键 词：探测器响应函数 CsI(Tl)探测器 γ射线能谱 

分 类 号：O571.1[理学—粒子物理与原子核物理] O582[理学—物理]