This research demonstrates the effectiveness of shielding methods against cosmic rays in space travel, indicating critical health implications for crew members.
During the interplanetary flights the crew members will be exposed to cosmic ray radiation, with great risk for their health. The absorbed dose due to CR depends on the galactic (GCR) or solar (SCR) origin. GCRs are isotropic, and relatively high in energy and deliver a dose nearly constant, with the time, that can be reduced only by means of "heavy" passive protections. The SCRs up to a few tens of MeV are usually shielded by the outer walls of the spacecraft, but during some exceptional solar bursts, a grat number of particles, mainly protons, are ejected at higher energies. In this case the dose given in a few hours by a solar burst can easily exceed 1 year cumulated dose by GCRs. The high energy component of SCRs is quai-directional so that a shielding system based on a superconductive magnetic lens can reduce the daily dose of SCRs to the only one delivered by GCRs.
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P. et al. (1999) studied this question.
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