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Space radiation shielding for a Martian habitatRadiation shielding analyses are performed for a candidate Mars base habitat. The Langley cosmic ray transport code and the Langley nucleon transport code are used to quantify the transport and attenuation of galactic cosmic rays and solar flare protons through both the Martian atmosphere and regolith shielding. Doses at the surface and at various altitudes were calculated in a previous study using both a high-density and a low-density Mars atmosphere model. This study extends the previous low-density results to include the further transport of the ionizing radiation that reaches the surface through additional shielding provided by Martian regolith. A four-compound regolith model, which includes SiO2, Fe2O3, MgO, and CaO, was selected based on the chemistry of the Viking 1 Lander site. The spectral fluxes of heavy charged particles and the corresponding dosimetric quantities are computed for a series of thicknesses in the shield media after traversing the atmosphere. These data are then used as input to algorithms for a specific shield geometry. The results are presented as the maximum dose received in the center of the habitat versus various shield thicknesses for a base at an altitude of 0 km and 8 km.
Document ID
19900062325
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Simonsen, Lisa C.
(NASA Langley Research Center Hampton, VA, United States)
Nealy, John E.
(NASA Langley Research Center Hampton, VA, United States)
Townsend, Lawrence W.
(NASA Langley Research Center Hampton, VA, United States)
Wilson, John W.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 14, 2013
Publication Date
July 1, 1990
Subject Category
Ground Support Systems And Facilities (Space)
Report/Patent Number
SAE PAPER 901346
Accession Number
90A49380
Distribution Limits
Public
Copyright
Other

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