Charge Code for Space Radiation Shielding Analysis

摘要

The report describes CHARGE, a FORTRAN IV program for the analysis of primary electron and proton or heavy charged particle passage through plane or spherical shields containing up to 100 regions, and the attendant generation and transmission of electron-induced X-rays (bremsstrahlung) and proton-induced secondary protons and neutrons. Proton and electron analyses use a modification of the range-energy relationship applied to as many as 100 energy groups, while the bremsstrahlung transmission calculation assumes an exponential attenuation corrected by semi-empirical dose buildup factors applied individually to a similar number of gamma ray energies. Availability of several bremsstrahlung source options permit comparison of most commonly used approximations. Energy dependent removal cross sections are used to calculate secondary neutron transmission. (Author)