Geant4用于模拟现场中子谱慢化材料选型适用性研究

Study on the Suitability of Geant4 for the Selection of Moderation Material Used to Simulated Workplace Neutron Spectrum

针对基于DT中子源的模拟工作现场中子谱慢化设计需求,通过分析中子反应截面,选择14种备选材料,从中子倍增、降能和瞬发γ三个方面分析,开展14 MeV中子慢化材料选型研究。利用Geant4与MCNP计算结果进行对比及Am-Be中子源进行慢化实验验证,分析Geant4用于模拟现场中子谱慢化材料选型的可靠性。通过模拟对比与实验分析表明,Geant4用于模拟谱装置慢化材料选型及中子能谱及剂量计算结果适用,为进一步模拟谱装置结构设计奠定基础。

In view of the moderation design requirements of simulated workplace neutron fields based on D-T neutron source,by analyzing the neutron reaction cross section,14 alternative materials were selected.Considering neutron multiplication,energy reduction and promptγ,conduct research on moderation material selection for 14 MeV neutron was conducted.The calculation results of Geant4 and MCNP were compared and the Am-Be neutron source was used to verify the moderation experiment,and the suitability of Geant4 for simulating field neutron spectrum moderation material selection was analyzed.Therefore,the simulation comparison and experimental analysis show that Geant4 is suitable for the selection of moderator materials and the calculation of neutron energy spectrum and dose for the simulated workplace neutron fields,which lays a foundation for the further structural design of the simulated workplace neutron fields instrument.