A Monte Carlo code is described which simulates the displacement process and the transmissions of energetic particles in solids by ion bombardment, including the operating principle, the physics model and the computing examples. Based on the binary collision approximation, the depth distributions of displasced atoms in amorphous targets induced by α particles are investigated, and the relations between the depth distributions of displaced atoms and energy deposition in solids are discussed.

A Monte-Carlo Neutron Transport Program and Neutron Radiation Damage Program are presented for studying radiation damage in the First Wall. The programs are used to static multi-component amorphous target. With the average wall load 1MW/m², the following calculating results for EHR first wall (type 316 stainlees steel)have been performed using designed neutron spectrums at EHR first wall: the PKA energy spectrums (30eV to 1MeV), average displacement per atom rate (20.6dpa/a), average helium and hydrogen production rates (247.18appm/a and 721.15appm/a). It is shows that Hybrid Reactor's radiation damage more serious than pure Fusion Reactor's by comparison of above results and EHP's calculated results in the same wall load. The cross-section data from MC (87) n library is used in this calculation.