Predictions of secondary particle spectra inside the International Space Station (ISS)

As part of a study to assess the contribution of secondary particlesin producing radiation damage to astronauts as well as electronic devices located on the ISS, Geant4 calculations have been made to predict secondary particle spectra vs shielding inside ISS module. A simplified shielding model is used for the radiation transport calculations.The calculations take into account secondary particle production from Galactic Cosmic Rays (GCR) protons. Comparisons of the predicted particle spectra for different Geant4 nuclear physics models will be presented and discussed.