Abstract: Space radiation is one of the main risks for astronauts during space station missions. Because of the complex composition of space radiation particles and the wide range of energy, the study of space radiation particle spectrum can better assist the effect study of space radiation particle on astronauts. Also, the astronaut safety protection mechanism will be further improved. The spatial radiation particle spectrum simulated by Shandong Institute of Advanced Technology and the voxel model of ICRP adult male were used, and an equal-scale model of the “Tianhe” core module was constructed based on the Monte Carto program Geant4.The space radiation dose to astronauts during long-term space station mission in Low Earth Orbit(LEO) was estimated based on the particle flux data. The results show that the skin dose rate reaches 2.22 mGy·d^-1 after 163 days in the core module of the space station, and the high energy heavy ions, although only 0.5% in the space radiation particle spectrum, contribute 14.6% of the space radiation dose. This study has some reference significance for astronaut risk assessment and biological effects of high energy heavy ion radiation.

Key words: space radiation, astronaut, radiation dose, Monte Carlo