Abstract
The purpose of the work reported in this paper was to determine the expected lifetime of PbS infrared detectors in the lower Van Allen radiation belt. Commercially available PbS cells were bombarded with high energy protons (7.5 MeV to 450 MeV) with the integrated proton flux ranging from 10 10 protons/cm 2 to 10 16 protons/cm 2. A comparison of the known information about the Van Allen belt and the experimental data obtained in this work indicates that PbS cells can function properly for at least 2 years in such an environment. Similar cells were also irradiated with neutrons. The changes in the PbS detector characteristics as a result of neutron irradiation are similar to the changes for proton bombardment and results show that these PbS cells can tolerate an integrated neutron flux of about 10 15 nν 0 ι (thermal neutrons/cm 2) without serious effects.
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