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Preliminary analyses of space radiation protection for lunar base surface systemsRadiation shielding analyses are performed for candidate lunar base habitation modules. The study primarily addresses potential hazards due to contributions from the galactic cosmic rays. The NASA Langley Research Center's high energy nucleon and heavy ion transport codes are used to compute propagation of radiation through conventional and regolith shield materials. Computed values of linear energy transfer are converted to biological dose-equivalent using quality factors established by the International Commision of Radiological Protection. Special fluxes of heavy charged particles and corresponding dosimetric quantities are computed for a series of thicknesses in various shield media and are used as an input data base for algorithms pertaining to specific shielded geometries. Dosimetric results are presented as isodose contour maps of shielded configuration interiors. The dose predictions indicate that shielding requirements are substantial, and an abbreviated uncertainty analysis shows that better definition of the space radiation environment as well as improvement in nuclear interaction cross-section data can greatly increase the accuracy of shield requirement predictions.
Document ID
19900040399
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Nealy, John E.
(NASA Langley Research Center Hampton, VA, United States)
Wilson, John W.
(NASA Langley Research Center Hampton, VA, United States)
Townsend, Lawrence W.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 14, 2013
Publication Date
July 1, 1989
Subject Category
Aerospace Medicine
Report/Patent Number
SAE PAPER 891487
Accession Number
90A27454
Distribution Limits
Public
Copyright
Other

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