  Space radiation is well-known to pose serious issues to solid-state
high-energy sensors. Therefore, radiation models play a key role in the
preventive assessment of the radiation damage, duty cycles, performance and
lifetimes of detectors. In the context of HERMES-SP mission we present our
investigation of AE8/AP8 and AE9/AP9 specifications of near-Earth trapped
radiation environment. We consider different circular Low-Earth orbits. Trapped
particles fluxes are obtained, from which maps of the radiation regions are
computed, estimating duty cycles at different flux thresholds. Outcomes are
also compared with published results on in-situ measurements.
