锂玻璃探测器^(6)Li原子数标定

Calibration of^(6)Li atomic number of lithium glass detector

在聚变包层中子学性能的实验检验中,造氚率是重要的测量参数之一,探测器中^(6)Li原子数目作为计算造氚率的归一化因子,是决定测量结果精度的关键因素,必须进行精确标定。对^(6)Li原子数标定原理、实验配置及过程、不确定度量化方法进行具体介绍,并首次在中国绵阳研究堆(CMRR)的M5水平孔道以锗单晶单色器获得32.36 meV中子对小型锂玻璃探测器中^(6)Li原子数进行了标定,不确定度为2.62%。

In experimental validations of fusion blanket neutronics performance,tritium production rate is one of the most crucial measurement parameters.The number of ^(6)Li atoms in the detector,as a normalization factor for calculating the tritium production rate,is a key factor determining the accuracy of measurement results and must be accurately calibrated.This paper specifically introduces the principles of calibrating the number of^(6)Li,the experimental setup and procedure,and the methods for quantifying uncertainties.For the first time,the number of^(6)Li atoms in a small lithium glass detector was calibrated using a germanium monocrystal monochromator to obtain 32.36 meV neutrons at the M5 horizontal channel of the China Mianyang Research Reactor(CMRR),with an uncertainty of 2.62%.