空间辐射剂量及屏蔽效应研究  

Radiation dose and shielding effects for space radiation

作　　者：曾志[1] 李君利[1] 贾向红 许峰 黄增信 

机构地区：[1]清华大学工程物理系,北京100084 [2]航天医学与工程研究所,北京100094

出　　处：《清华大学学报（自然科学版）》2008年第3期391-394,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(10575065)

摘　　要：为分析空间辐射剂量及屏蔽效应,建立空间辐射剂量MonteCarlo评估方法。建立了符合空间辐射点点分布均匀、处处各向同性的抽样方法,并实现了基于体元的人体屏蔽模型。计算了3种屏蔽厚度下质子空间辐射的器官当量剂量和有效剂量分布,分析了不同厚度的屏蔽效果。结果表明,器官当量剂量在100～200MeV之间存在高峰,有效剂量在200MeV左右存在高峰;随能量增加,次级粒子有效剂量贡献增大,重粒子增长速度最快;提出了加大眼晶体和性腺屏蔽厚度,开发新型辐射屏蔽材料的建议。A Monte Carlo method was developed for dose assessment to analyze radiation dose rates and shielding effects for space radiation. The uniform, isotropic sampling algorithm was integrated with a voxel-based human phantom. The distributions of equivalent dose and effective dose per unit proton flux were calculated for three shielding thicknesses to analyze the effects of different shielding thicknesses. The peak of equivalent dose was between 100 and 2OO MeV with a maxinmum effect dose at about 200 MeV. The contribution to the effective dose of secondary particles increased with increasing proton energy with heavy charge particle （HZE） increasing the fastest. The results show that the shielding for eyes and testicles should be thicker to reduce the radiation damager.

关 键 词：空问辐射 MONTE CARLO方法 体元模型 辐射源 

分 类 号：O562.1[理学—原子与分子物理] X591[理学—物理]