基于Geant4模拟中子输运过程及建立中子监测模型

摘要

通过研究Geant4程序的中子输运模型与反应截面库,构建热中子至20 MeV中子的输运过程,为验证Geant4中子输运过程的正确性,通过建立中子监测模型,再根据监测模型设计试验装置,最后将试验装置放入中子参考辐射场中进行测试验证.模拟与实验结果表明:试验装置在241Am-Be中子源和252Cf源中子参考辐射场中测试结果最大误差为2.5％.%Through the study of the neutron transport model and the reaction cross section library of Geant4 soft,a thermal to 20 MeV neutron transport process is constructed.To verify the correctness of the Geant4 neutron transport process,a neutron monitoring modelis established.According to the monitoring model,a equipment testing is designed.Finally,the assay device was tested in neutron reference radiation field.Simulation and experimental results show that the maximum error is 2.5％ when the assay device testing in 241Am-Be neutron resottrce and 252Cf neutron resource reference radiation field.Thus it also proves that Geant4 can be very good to simulate neutron transport and calculate monitoring model.