Abstract
Abstract In this paper details are given of an experiment in space where CaSO4:Dy-Teflon rods were irradiated on the outer surface of an unmanned spacecraft rotating around the Earth. The exposure in space took six days. The dose distribution inside the CaSO4:Dy-Teflon rods was established by using ultra-thin CaSO4:Dy-Teflon discs cut from the rods, and evaluating them on a microcomputerised TLD system. The absorbed dose distribution shows that a large dose component originates from the soft radiation of the cosmic rays, i.e. from low energy protons, alpha and beta particles, since the dose attenuation is quite large in the first few millimetres in the CaSO4:Dy-Teflon rods.
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