NDLI: Estimates of galactic cosmic ray shielding requirements during solar minimum

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Estimates of galactic cosmic ray shielding requirements during solar minimum

Content Provider	NASA Technical Reports Server (NTRS)
Author	Wilson, John W. Nealy, John E. Townsend, Lawrence W. Simonsen, Lisa C.
Copyright Year	1990
Description	Estimates of radiation risk from galactic cosmic rays are presented for manned interplanetary missions. The calculations use the Naval Research Laboratory cosmic ray spectrum model as input into the Langley Research Center galactic cosmic ray transport code. This transport code, which transports both heavy ions and nucleons, can be used with any number of layers of target material, consisting of up to five different arbitrary constituents per layer. Calculated galactic cosmic ray fluxes, dose and dose equivalents behind various thicknesses of aluminum, water and liquid hydrogen shielding are presented for the solar minimum period. Estimates of risk to the skin and the blood-forming organs (BFO) are made using 0-cm and 5-cm depth dose/dose equivalent values, respectively, for water. These results indicate that at least 3.5 g/sq cm (3.5 cm) of water, or 6.5 g/sq cm (2.4 cm) of aluminum, or 1.0 g/sq cm (14 cm) of liquid hydrogen shielding is required to reduce the annual exposure below the currently recommended BFO limit of 0.5 Sv. Because of large uncertainties in fragmentation parameters and the input cosmic ray spectrum, these exposure estimates may be uncertain by as much as a factor of 2 or more. The effects of these potential exposure uncertainties or shield thickness requirements are analyzed.
File Size	833010
Page Count	18
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19900008219
Archival Resource Key	ark:/13960/t0sr3s893
Language	English
Publisher Date	1990-02-01
Access Restriction	Open
Subject Keyword	Space Radiation Water Aluminum Galactic Cosmic Rays Organs Solar Activity Effects Radiation Shielding Models Exposure Manned Space Flight Liquid Hydrogen Estimates Radiation Dosage Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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