【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Cs₂⁶LiYCl₆: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。更多还原

【Abstract】 Based on Cs₂ ⁶ LiYCl₆: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.更多还原