Space radiation environment and human dose calculation based on Monte Carlo method

Proton and alpha differential spectrum from galactic cosmic radiation(GCR) and solar particle event (SPE) were analyzed, also calculations about inside shielding environment and skin dose were performed. Through simulation we confirmed the precise of Geant4 again. The depth dose distribution of the inside radiation was calculated to get more information about the space environment inside shielding. As a conclusion, both with GCR proton and alpha particle there is no obvious decrease of dose with Al shielding, however, SPE spectrum does weaken as it has different energy distribution. We calculated the skin dose under different shielding thickness of 1972 SPE, obvious dose decrease was attained with increase shielding thickness.