Physics
Scientific paper
Nov 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007stin...0813163b&link_type=abstract
Technical Report, NASA/TP-2007-215133; M-1208
Physics
Lunar Surface, Optimization, Flight Crews, Reactors, Space Missions, Radiation Shielding, Extraterrestrial Radiation, Lunar Rocks, Solar Activity Effects, Radiation Sources, Simulation, Regolith, Fission
Scientific paper
On the surface of the moon and not only during heightened solar activities the radiation environment is such that crew protection will be required for missions lasting in excess of six months. This study focuses on estimating the optimized crew shielding requirement for lunar surface missions with a nuclear option. Simple, transport-simulation based dose-depth relations of the three radiation sources (galactic, solar, and fission) are employed in a one-dimensional optimization scheme. The scheme is developed to estimate the total required mass of lunar regolith separating reactor from crew. The scheme was applied to both solar maximum and minimum conditions. It is shown that savings of up to 30% in regolith mass can be realized. It is argued, however, that inherent variation and uncertainty mainly in lunar regolith attenuation properties in addition to the radiation quality factor can easily defeat this and similar optimization schemes.
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