特大太阳质子事件所致航天员辐射剂量估算研究  

Study on Assessment of Absorbed Radiation Dose of Astronaut in Super-large Solar Particle Events

作　　者：曾志[1] 贾向红[2] 李君利[1] 许峰[2] 

机构地区：[1]清华大学工程物理系 [2]中国航天员科研训练中心,北京100193

出　　处：《航天医学与医学工程》2008年第5期382-385,共4页Space Medicine & Medical Engineering

基　　金：国家自然科学基金(10575065,10705019)

摘　　要：目的为估算载人航天无地磁屏蔽下特大太阳质子事件的辐射剂量,建立包括构造特大太阳质子事件能谱、人体模型和Monte Carlo输运程序的解决方案。方法建立航天器和人体屏蔽模型,编写的Monte Carlo程序计算用大于30 MeV质子注量归一化的1956年和1972年特大太阳质子事件所致的器官吸收剂量。结果根据程序计算得到了不同屏蔽厚度两种谱型的特大太阳质子事件主要器官吸收剂量,与前人研究结果相近。结论通过比较验证计算方案结果可靠,特大太阳质子事件会造成很大器官吸收剂量,是载人航天非常大的潜在辐射危险。Objective To develope energic spectrum of super-large solar particle events （SPE）, human body model and a Monte Carlo method for estimating the organ dose of astronauts in SPE without the shielding of geomagnetic field. Methods A voxel-based human phantom and shielding model of spacecraft were developed and the Monte Carlo program was compiled and applied to calculate the doses of astronauts organs with the transport protons of the spectra of super-large SPEs in 1956 and 1972, normalized by the proton fluence for energy greater than 30 MeV. Results The Monte Carlo program was developed successfully and the organ dose under different shielding thickness were also calculated with the program in the normalized spectra of SPEs in 1956 and 1972 without the effects of geomagnetic field. They were similar with prior studies. Conclusion The results are reliable by the comparison with other calculations of prior researchers. Exposure to superlarge SPE without the shielding of geomagnetic field would result in a very large organ absorbed dose and may be very danger for manned spaceflight.

关 键 词：特大太阳质子事件 体元模型 MONTE Carlo法 空间辐射 

分 类 号：R852.7[医药卫生—航空、航天与航海医学]