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Improved model for solar cosmic ray exposure in manned Earth orbital flightsA calculational model is derived for use in estimating Solar cosmic ray exposure to critical body organs in low-Earth orbit at the center of a large spherical shield of fixed thickness. The effects of the Earth's geomagnetic field and the astronauts' self-shielding are evaluated explicitly. The geomagnetic field model is an approximate tilted eccentric dipole with geomagnetic storms represented as a uniform-impressed field. The storm field is related to the planetary geomagnetic index K(sub p). The code is applied to the Shuttle geometry using the Shuttle mass distribution surrounding two locations on the flight deck. The Shuttle is treated as pure aluminum and the astronaut as soft tissue. Short-term, average fluence over a single orbit is calculated as a function of the location of the lines of nodes or long-term averages over all lines of nodes for a fixed inclination.
Document ID
19900015715
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Wilson, John W. (NASA Langley Research Center Hampton, VA., United States)
Nealy, John E. (NASA Langley Research Center Hampton, VA., United States)
Atwell, William (Rockwell International Corp. Houston, TX., United States)
Cucinotta, Francis A. (Rockwell International Corp. Houston, TX., United States)
Shinn, Judy L. (NASA Langley Research Center Hampton, VA., United States)
Townsend, Lawrence W. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
June 1, 1990
Subject Category
Space Radiation
Report/Patent Number
NASA-TP-2987
NAS 1.60:2987
L-16759
Accession Number
90N25031
Funding Number(s)
PROJECT: RTOP 199-22-76-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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