Polyethylene as a radiation shielding standard in simulated cosmic-ray environments

Radiation risk management for human space missions depends on accurate modeling of high-energy heavy ion transport in matter.
The process of nuclear fragmentation can play a key role in reducing both the physical dose and the biological effectiveness of the radiation
encountered in deep space. Hydrogenous materials and light elements are expected to be more effective shields against the deleterious
effects of galactic cosmic rays (GCR) than aluminum, which is used in current spacecraft hulls. NASA has chosen polyethylene,
CH2, as the reference material for accelerator-based radiation testing of multi-function composites that are currently being developed.
A detailed discussion of the shielding properties of polyethylene under a variety of relevant experimental conditions is presented, along
with Monte Carlo simulations of the experiments and other Monte Carlo calculations in which the entire GCR flux is simulated. The
Monte Carlo results are compared to the accelerator data and we assess the usefulness of 1 GeV/amu 56Fe as a proxy for GCR heavy
ions. We conclude that additional accelerator-based measurements with higher beam energies would be useful.

書誌情報

Nuclear Instruments & Methods in Physics Research Section B

巻 252, 号 2, p. 319-332, 発行日 2006-11

ISSN

収録物識別子タイプ

ISSN

収録物識別子

0168-583X

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