SPACE APPLICATIONS OF THE MITS ELECTRON-PHOTON MONTE-CARLO TRANSPORT CODE SYSTEM

The MITS multigroup/continuous-energy electron-photon Monte Carlo tran sport code system has matured to the point that it is capable of addre ssing more realistic three-dimensional adjoint applications. It is fir st employed to efficiently predict point doses as a function of source energy for simple three-dimensional experimental geometries exposed t o planar sources of monoenergetic electrons up to 4.0 MeV due to simul ated uniform isotropic fluences. Results are in very good agreement wi th experimental data. It is then used to efficiently simulate dose to a detector in a subsystem of a GPS satellite from the natural electron environment, employing a relatively complex model of the satellite. T he capability for survivability analysis of space systems is demonstra ted, and results are obtained with and without variance reduction.