PARTICLE DIRECTIONALITY AND TRAPPED PROTON FLUENCES ON LDEF

Directionality of incident space radiation is a significant factor in spacecraft shielding and astronaut dosimetry in low Earth orbit (LEG). Particle directionality of GCR and trapped protons were measured on L DEF with plastic nuclear track detectors (PNTD) from the P0006 west-si de experiment. This experiment consisted of a thick detector stack and is described more fully in a companion article (Benton et al., 1996). The anisotropy of the trapped protons produced maximum intensity for protons arriving from the west. The fluences of the eastward directed trapped protons have been measured by selection of the particles on th e basis of range in the PNTDs. The measured fluences are compared with the model calculations of Armstrong and Colborn (1993). Copyright (C) 1996 Elsevier Science Ltd