Validation of a comprehensive space radiation transport code

The HZETRN code has been developed over the past decade to evaluate the loc al radiation fields within sensitive materials on spacecraft in the space e nvironment. Most of the more important nuclear and atomic processes are now modeled and evaluation within a complex spacecraft geometry with differing material components, including transition effects across boundaries of dis similar materials, are included. The atomic/nuclear database and transport procedures have received limited validation in laboratory testing with high energy ion beams.,The codes have been applied in design of the SAGE-III in strument resulting in material changes to control injurious neutron product ion, in the study of the Space Shuttle single event upsets, and in validati on with space measurements (particle telescopes, tissue equivalent. proport ional counters, CR-39) on Shuttle and Mir. The present paper reviews the co de development and presents recent results in laboratory and space flight v alidation.