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利用蒙特卡罗程序包Geant4,模拟了14 Me V中子在水、聚乙烯、碳酸钙和氧化铁4种不同介质中的非弹性散射时间与俘获时间;通过分析脉冲宽度为10μs的14 Me V脉冲中子在这4种不同介质中的非弹性散射与俘获时间分布,得到非弹性散射与俘获时间门的宽度;利用得到的非弹性散射与俘获时间门,获得了14 Me V脉冲中子在聚乙烯介质中的净非弹性散射γ谱与净俘获γ谱。
Using the Monte Carlo package Geant4, the inelastic scattering time and trapping time of 14 Me V neutrons in four different media of water, polyethylene, calcium carbonate and iron oxide were simulated. By analyzing 14 Me V The inelastic scattering and trapping time distributions of the pulsed neutrons in the four different media are obtained, and the width of inelastic scattering and capture time gates is obtained. Using the obtained inelastic scattering and trapping time gates, the 14 MeV pulsed neutron Net Inelastic Scattering γ Spectra and Net Capture γ Spectra in Polyethylene.