A proposed performance index for galactic cosmic ray shielding materials
In 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.
- Research Organization:
- National Aeronautics and Space Administration, Hampton, VA (United States). Langley Research Center
- OSTI ID:
- 5752893
- Report Number(s):
- N-94-11278; NASA-TM-4444; L-17199; NAS-1.15:4444; CNN: RTOP 592-43-21-01
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COSMIC SHOWERS
RADIATION PROTECTION
HEAVY IONS
SHIELDING MATERIALS
BIOLOGICAL RADIATION EFFECTS
COSMIC RADIATION
DOSE EQUIVALENTS
ENERGY TRANSFER
LET
PERFORMANCE
RADIATION DOSES
BIOLOGICAL EFFECTS
CHARGED PARTICLES
DOSES
IONIZING RADIATIONS
IONS
MATERIALS
RADIATION EFFECTS
RADIATIONS
SECONDARY COSMIC RADIATION
SHOWERS
560180* - Radiation Protection Procedures- (1992-)