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空间辐射环境下的高能重离子入射屏蔽材料会产生大量次级粒子,为研究屏蔽材料产生的次级粒子对太空舱内辐射环境的影响,本文使用基于蒙特卡罗方法的Geant4软件模拟空间高能~(56)Fe离子入射铝、碳、聚乙烯、水4种屏蔽材料,分析透射屏蔽体的初级粒子及由屏蔽材料产生的次级电子、次级中子、次级质子和次级γ的能谱以及水吸收体中的能量沉积和深度剂量分布。分析产生的次级重粒子类型和能量,比较4种屏蔽材料对高能Fe离子的屏蔽性能。结果表明,聚乙烯材料对高能重离子的屏蔽性能最好,但同时产生的次级重粒子的能量最大,约为铝材料产生次级重粒子能量的4倍。屏蔽体产生所有次级粒子中,次级质子和原子序数为22-26的次级重粒子贡献最大。
In order to study the influence of the secondary particles produced by shielding materials on the radiation environment in space capsule, Geant4 software based on Monte Carlo method is used to simulate the space high energy ~ (56) Fe ions are implanted into four kinds of shielding materials, such as aluminum, carbon, polyethylene and water. The primary particles of the shielding material and the secondary electrons, secondary neutrons, secondary protons and secondary γ Spectral and energy deposition and depth dose distribution in water absorbers. The type and energy of the secondary heavy particles generated were analyzed. The shielding properties of high energy Fe ions by four kinds of shielding materials were compared. The results show that polyethylene has the best shielding performance for high energy heavy ions, while the secondary heavy particles produce the largest energy at about 4 times the energy of the secondary heavy particles produced by aluminum. Of all the secondary particles produced by the shield, the secondary protons and the secondary heavy particles with atomic numbers 22-26 contribute the most.