A computer model to determine the primary contributors to relative radiation dose received by astronauts

Details A computer model to determine the primary contributors to relative radiation dose received by astronauts A computer model to determine the primary contributors to relative radiation dose received by astronauts

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aipc..217.1365l&link_type=abstract

Proceedings of the eighth symposium on space nuclear power systems. AIP Conference Proceedings, Volume 217, pp. 1365-1371 (1991

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Propulsion Reactors, Lunar, Planetary, And Deep-Space Probes

Scientific paper

This paper describes a computer model which was used to determine the relative radiation dose of protons of different energies. In the future, the model will be extended to calculate the dosage received by an astronaut during a specific mission to Mars, and within a spacecraft with specific materials and with a specific geometry. The framework for the calculations centered on the computer program HETC, a Monte Carlo transport code for computing the properties of high energy nucleon-meson cascades in matter. It is valid up to several hundred GeV. It was found that protons in the energy range from 50 to 200 MeV are the largest contributor to the radiation dose to a human inside an Al structure 1 cm thick. Other studies have predicted a dose-equivalent of several Sv (several hundred rem) to each crew member during the voyage. LD50 is the amount of radiation required to produce death in 50% of the organisms within 30 days. Since LD50 is 4.5 Sv (450 rem) for people, several Sv is a relatively high value.

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