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Abstract
Protons generate one of the most important contributions to the background noise in space gamma-ray telescope observations. This contribution comes from their direct interactions with the detector as well as surrounding materials. Cosmic and geomagnetically trapped protons are the main sources of this proton flux. An accurate estimation of this background component before the construction of a telescope is a key point in order to ensure the foreseen instrument performances. In this paper we present a comparison between experimental spectra acquired by CsI(Tl) detector units irradiated with 0.2 and 1.0 GeV protons and the results provided by a complete modelling of these units using different data of unstable isotope production cross-sections (experimental, semiempirical expressions of Silberberg and Tsao and the package GEANT/GCALOR based on Monte Carlo techniques). In all cases a better reproduction of the experimental spectra has been obtained by using the experimental production cross-sections. Data obtained from Silberberg and Tsao expressions generate a more accurate modelling than the GEANT/GCALOR approximations.
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