Abstract
The radiation risk to humans in space requires the knowledge of the linear energy transfer spectra of the radiation in tissue. These spectra can be calculated from the knowledge of the free space radiation environment, knowledge of the shielding distribution, and a radiation transport model. In this paper we present the measurements of radiation dose and LET spectra for a number of Space Shuttle flights using a tissue equivalent proportional counter. A detailed comparison of these measurements has been made with the radiation transport code, HZETRN. The results show that this code provides a good description of the dose and equivalent dose (± 15%) but not of the LET spectrum.
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