Cs_(2)^(6)LiYCl_(6):Ce探测器γ响应函数的高斯展宽及解谱研究  

Gaussian Broadening of γ Response Function and Spectrum Resolution for Cs_(2)^(6)LiYCl_(6):Ce Detector

作　　者：唐生达 兰长林[1] 聂阳波[2] 洪博 阮锡超[2] 李小军 TANG Sheng-da;LAN Chang-lin;NIE Yang-bo;HONG Bo;RUAN Xi-chao;LI Xiao-jun(School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China;Key Laboratory of Nuclear Data,China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]兰州大学核科学与技术学院,兰州730000 [2]中国原子能科学研究院核数据重点实验室,北京102413

出　　处：《现代应用物理》2021年第4期20-26,共7页Modern Applied Physics

基　　金：国家自然科学基金资助项目(11975113)。

摘　　要：针对利用MCNP中GEB卡的函数拟合探测器分辨率实验数据时不收敛,模拟结果与实验结果偏差较大的情况,首先基于Cs_(2)^(6)LiYCl_(6):Ce(CLYC)闪烁体探测器,利用MCNP模拟了0.1~5 MeV的246条未展宽单能γ射线,根据GEB卡的函数,编写了解析法高斯展宽MATLAB计算程序,构造了不同能量分辨率下的响应矩阵,并对模拟混合谱进行解谱,验证了响应矩阵的准确性;其次,在实验数据拟合不收敛的情况下,调整拟合函数,得到符合实验条件的响应矩阵,并采用加权最小二乘法进行解谱验证。计算结果表明:不同能量分辨率下,模拟混合谱求解结果与设定值一致,通过解析法展宽后的响应函数与实验数据基本吻合,能够准确求解出源项信息。Based on Cs_(2)^(6)LiYCl_(6):Ce(CLYC)scintillator detector,246 unbroadened single energy gamma rays from 0.1 MeV to 5 MeV are simulated by MCNP.Using the function of GEB card,the MATLAB calculation program of analytical Gaussian broadening is compiled,the response matrix under different energy resolutions is constructed,the simulated mixed spectrum is solved,and the accuracy of the response matrix is verified by unfolding mixed spectrum.The fitting function is adjusted to obtain the response matrix in line with the experimental conditions,and the weighted least squares unfolding spectrum is used for spectral verification.The calculation results show that under different energy resolutions,the solution results of the simulated mixed spectrum are consistent with the set value.The response function widened by the analytical method is basically consistent with the experimental data,and the source term information can be solved accurately.

关 键 词：解析法高斯展宽 能量分辨率 MCNP模拟 响应矩阵 加权最小二乘解谱 

分 类 号：TL816[核科学技术—核技术及应用]