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Geant4 Monte Carlo Simulations of the Belt Proton Radiation Environment On board the International Space Station/Columbus
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2007 (English)In: IEEE Trans. Nucl. Sci., Vol. 54, no No 4, 1444-1453 p.Article in journal (Other (popular science, discussion, etc.)) Published
Abstract [en]

A detailed characterization of the trapped-proton-induced radiation environment on board Columbus and the International Space Station (ISS) has been carried out using the Geant4 Monte Carlo particle transport toolkit. Dose and dose equivalent rates, as well as penetrating particle spectra are presented. These results are based on detailed Geant4 geometry models of Columbus and ISS, comprising a total of about 1000 geometry volumes.

Simulated trapped-proton dose rates are found to be strongly dependent on ISS altitude. Dose rates for different locations inside the Columbus cabin are presented, as well as for different models of the incident trapped-proton flux. Dose rates resulting from incident anisotropic trapped protons are found to be lower than, or equal to, those of omnidirectional models. The anisotropy induced by the asymmetric shielding distribution of Columbus/ISS is also studied. The simulated trapped-proton dose (equivalent) rates, averaged over different locations inside Columbus, are 120 Gy/d (154 Sv/d) and 79 Gy/d (102 Sv/d) for solar minimum and maximum conditions according to AP8 incident proton spectra and an ISS orbit of 380 km. The solar maximum dose rates are found to be of the same order as measurements in other modules in the present ISS.

Place, publisher, year, edition, pages
2007. Vol. 54, no No 4, 1444-1453 p.
URN: urn:nbn:se:su:diva-21550OAI: diva2:188077
Available from: 2007-12-12 Created: 2007-12-12 Last updated: 2011-01-11Bibliographically approved

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