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Effects of Nuclear Cross Sections at Different Energies on the Radiation Hazard from Galactic Cosmic Rays

Z. W. Lin and J. H. Adams, Jr.
Radiation Research
Vol. 167, No. 3 (Mar., 2007), pp. 330-337
Stable URL: http://www.jstor.org/stable/4127487
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Effects of Nuclear Cross Sections at Different Energies on the Radiation Hazard from Galactic Cosmic Rays
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Abstract

The radiation hazard for astronauts from galactic cosmic rays (GCR) is a major obstacle to long-duration human space exploration. Space radiation transport codes have been developed to calculate the radiation environment on missions to the Moon, Mars and beyond. We have studied how uncertainties in fragmentation cross sections at different energies affect the accuracy of predictions from such radiation transport calculations. We find that, in deep space, cross sections at energies between 0.3 and 0.85 GeV/nucleon usually have the largest effect on the dose equivalent behind shielding in solar minimum GCR environments and that cross sections at energies between 0.85 and 1.2 GeV/nucleon have the largest effect in solar maximum GCR environments. At the International Space Station, cross sections at higher energies have the largest effect due to the geomagnetic cutoff.

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