SPACE PROTON TRANSPORT IN ONE-DIMENSION

An approximate evaluation procedure is derived for a second-order theo ry of coupled nucleon transport in one dimension. An analytical soluti on with a simplified interaction model is used to determine quadrature parameters to minimize truncation error. Effects of the improved meth od on transport solutions with the BRYNTRN data base are evaluated. Co mparisons with Monte Carlo benchmarks are given. Using different shiel d materials, the computational procedure is used to study the physics of space protons. A transition effect occurs in tissue near the shield interface and is most important in shields of high atomic number.