Naturally induced secondary radiation in interplanetary space: Preliminary analyses for gamma radiation and radioisotope production from thermal neutron activation

Details Naturally induced secondary radiation in interplanetary space: Preliminary analyses for gamma radiation and radioisotope production from thermal neutron activation Naturally induced secondary radiation in interplanetary space: Preliminary analyses for gamma radiation and radioisotope production from thermal neutron activation

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991asee.nasa..181p&link_type=abstract

In Old Dominion Univ., NASA/American Society for Engineering Education (ASEE) Summer Faculty Fellowship Program, 1991 p 181-185

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Computation

Aerospace Systems, Contamination, Gamma Rays, Habitats, Manned Spacecraft, Neutron Activation Analysis, Radiation Dosage, Radiation Hazards, Radiation Shielding, Radioactivity, Solar Flares, Aluminum, Fast Neutrons, Health, Interplanetary Space, Liquid Hydrogen, Neutron Distribution, Propellant Tanks, Radioactive Isotopes, Regolith, Thermal Neutrons

Scientific paper

Thermal neutron activation analyses were carried out for various space systems components to determine gamma radiation dose rates and food radiation contamination levels. The space systems components selected were those for which previous radiation studies existed. These include manned space vehicle radiation shielding, liquid hydrogen propellant tanks for a Mars mission, and a food supply used as space vehicle radiation shielding. The computational method used is based on the fast neutron distribution generated by the BRYNTRN and HZETRN transport codes for Galactic Cosmic Rays (GCR) at solar minimum conditions and intense solar flares in space systems components. The gamma dose rates for soft tissue are calculated for water and aluminum space vehicle slab shields considering volumetric source self-attenuation and exponential buildup factors. In the case of the lunar habitat with regolith shielding, a completely exposed spherical habitat was assumed for mathematical convenience and conservative calculations. Activation analysis of the food supply used as radiation shielding is presented for four selected nutrients: potassium, calcium, sodium, and phosphorus. Radioactive isotopes that could represent a health hazard if ingested are identified and their concentrations are identified. For nutrients soluble in water, it was found that all induced radioactivity was below the accepted maximum permissible concentrations.

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