3. DESCRIPTION OF PROBLEM OR FUNCTION
SIGMA/B calculates radiation dose at arbitrary points inside a space vehicle, taking into account vehicle geometry, heterogeneous placement of equipment and stores, vehicle materials, time-weighted astronaut positions and many radi- ation sources from mission trajectories, e.g. geomagnetically trap- ped protons and electrons, solar flare particles, galactic cosmic rays and their secondary radiations. The vehicle geometry, equip- ment and supplies, and man models are described by quadric surfaces. The irradiating flux field may be anisotropic.
The code can be used to perform simultaneous dose calculations for multiple vehicle trajectories, each involving several radiation sources. Results are presented either as dose as a function of shield thickness, or the dose received through designated outer sections of the vehicle.