Shielding Problems for Manned Space Missions

In order to estimate the magnitude of the radiation hazard presented by solar flare and Van Allen belt proton radiation, a simple spherical-shell shield geometry was chosen and physical dose calculatved as a function of shell thickness. Both point-target and body-phantom definitions of dose were used to define the primary particle dose. The secondary particles formed in the shield are shown to contributve a significant fraction of the total dose in the case of the 10 May 1959 flare spectrum and an aluminum shield.