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radiation shielding optimization on marsFuture space missions to Mars will require radiation shielding to be optimized for deep space transit and an extended stay on the surface. In deep space, increased shielding levels and material optimization will reduce the exposure from most solar particle events (SPE) but are less effective at shielding against galactic cosmic rays (GCR). On the surface, the shielding provided by the Martian atmosphere greatly reduces the exposure from most SPE, and long-term GCR exposure is a primary concern. Previous work has shown that in deep space, additional shielding of common materials such as aluminum or polyethylene does not significantly reduce the GCR exposure. In this work, it is shown that on the Martian surface, almost any amount of aluminum shielding increases exposure levels for humans. The increased exposure levels are attributed to neutron production in the shield and Martian regolith as well as the electromagnetic cascade induced in the Martian atmosphere. This result is significant for optimization of vehicle and shield designs intended for the surface of Mars.
Document ID
20130012456
Document Type
Technical Publication (TP)
Authors
Slaba, Tony C.
(NASA Langley Research Center Hampton, VA, United States)
Mertens, Chris J.
(NASA Langley Research Center Hampton, VA, United States)
Blattnig, Steve R.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 27, 2013
Publication Date
April 1, 2013
Subject Category
Space Radiation
Report/Patent Number
NASA/TP-2013-217983
NF1676L-16338
L-20242
Funding Number(s)
WBS: WBS 651549.02.07.10
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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