In order to further reduce the effect of matrix effect on the measurement results in fast neutron multiplicity counting, the Geant 4 simulation toolbox was used to simulation construct the detection system. Through a variety of materials simulated,the effect of the matrix was analyzed. The fast neutron multiplicity counting results with matrix were corrected to obtain more accurate and reliable measurement results. The experimental results show that the simulated value of Geant4 can be well matched with the experimental value in fast neutron multiplicity measurement. The simulation program can reduce the calculation error by modifying the matrix effect.%为进一步降低快中子多重性计数中基体效应对测量结果的影响,使用Geant4仿真工具箱模拟搭建探测系统,通过多种材料的基体效应进行模拟分析,对有容器的快中子多重性测量结果进行修正,获得更加准确可靠的测量结果.实验结果表明:快中子多重性测量中,使用Geant4的模拟值与实验值能较好吻合,该模拟程序可通过修正基体效应减小计算误差.
展开▼
