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A proposed performance index for galactic cosmic ray shielding materialsIn past studies, the reductions in absorbed dose and dose equivalent due to choice of material composition have been used to indicate shield effectiveness against exposure to galactic cosmic rays. However, these quantities are highly inaccurate in assessing shield effectiveness for protection against the biological effects of long-term exposure to the galactic heavy ions. A new quantity for shield performance is defined that correlates well with cell killing and cell transformation behind various shield thicknesses and materials. In addition, a relative performance index is identified that is inversely related to biological injury for different materials at a fixed shield mass and is directly related to the ratio of the fourth- and the second-order linear energy transfer (LET) moments.
Document ID
19940006806
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Wilson, John W.
(NASA Langley Research Center Hampton, VA, United States)
Wood, J. S.
(NASA Langley Research Center Hampton, VA, United States)
Shinn, Judy L.
(NASA Langley Research Center Hampton, VA, United States)
Cucinotta, Francis A.
(NASA Langley Research Center Hampton, VA, United States)
Nealy, John E.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1993
Subject Category
Space Radiation
Report/Patent Number
NASA-TM-4444
NAS 1.15:4444
L-17199
Accession Number
94N11278
Funding Number(s)
PROJECT: RTOP 592-43-21-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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