Advantages of Using a Combination Electromagnetic and Material Shield

A method for calculation of proton dose in a receiver behind a combination electromagnetic and material shield is described. Dose calculations for a typical Van Allen proton spectrum and three solar-proton-event spectra are presented. In general, the electromagnetic shield stops protons below a certain threshold energy and reduces the number and energy of protons above this energy, and material shielding is more effective against these protons of reduced energy since proton stopping power increases with decreasing energy.