LET-distributions and doses of HZE radiation components at near-Earth orbits. |
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Authors: | R Silberberg C H Tsao J H Adams J R Letaw |
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Institution: | Naval Research Laboratory, E.O. Hulburt Center for Space Research, Washington, DC 20375, USA. |
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Abstract: | Among cosmic rays, the heavy nuclei ranging from carbon to iron provide the principal contribution to the dose equivalent. The LET-distributions and absorbed dose aid dose equivalent have been calculated and are presented as a function of shielding and tissue self-shielding. At solar minimum, outside the magnetosphere, the unshielded dose equivalent of nuclei with atomic number Z > or = 6 is about 47 rem/year. The contribution of the target nuclei adds 7 rem/year. With 4 g/cm2 aluminum shielding, and at a depth of 5 cm in a biological phantom of 30 cm diameter, the respective values are 11 and 10 rem/year. Corresponding dose rates for orbits with various inclinations are presented, as well as the LET distributions of various components of cosmic rays. |
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