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comparison of martian meteorites and martian regolith as shield materials for galactic cosmic raysTheoretical calculations of radiation attenuation due to energetic galactic cosmic rays behind Martian rock and Martian regolith material have been made to compare their utilization as shields for advanced manned missions to Mars because the detailed chemical signature of Mars is distinctly different from Earth. The modified radiation fields behind the Martian rocks and the soil model were generated by solving the Boltzmann equation using a HZETRN system with the 1977 Solar Minimum environmental model. For the comparison of the attenuation characteristics, dose and dose equivalent are calculated for the five different subgroups of Martian rocks and the Martian regolith. The results indicate that changes in composition of subgroups of Martian rocks have negligible effects on the overall shielding properties because of the similarity of their constituents. The differences for dose and dose equivalent of these materials relative to those of Martian regolith are within 0.5 and 1 percent, respectively. Therefore, the analysis of Martian habitat construction options using in situ materials according to the Martian regolith model composition is reasonably accurate. Adding an epoxy to Martian regolith, which changes the major constituents of the material, enhances shielding properties because of the added hydrogenous constituents.
Document ID
19980237030
Document Type
Technical Publication (TP)
Authors
Kim, Myung-Hee Y.
(NASA Langley Research Center Hampton, VA United States)
Thibeault, Sheila A.
(NASA Langley Research Center Hampton, VA United States)
Simonsen, Lisa C.
(NASA Langley Research Center Hampton, VA United States)
Wilson, John W.
(NASA Langley Research Center Hampton, VA United States)
Date Acquired
September 6, 2013
Publication Date
October 1, 1998
Subject Category
Space Radiation
Report/Patent Number
NASA/TP-1998-208724
NAS 1.60:208724
L-17722
Funding Number(s)
PROJECT: RTOP 199-45-16-12
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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