Fast Neutron Irradiation of PbS and InSb Infrared Detectors.
NAVAL RESEARCH LAB WASHINGTON D C
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The effects of fast neutron irradiations on lead sulfide and indium antimonide infrared detectors is reported. A threshold for lead sulfide detectors has been established at 2 x 10 to the 12th power nsq cm with approximately 75 of the degradation attributable to a reduction in majority carrier lifetime. When stored at 300K, the detectors return to their original condition in tens to hundreds of days. Restoration of signal proceeds logarithmically with time rather than exponentially as is usually observed. For indium antimonide photovoltaic detectors, a threshold of 2 x 10 to the 11th power nsq cm has been observed. Measurements show that neutron irradiations produce both an increase in noise and a decrease in signal. These effects result from a decrease in 1 the leakage resistance, 2 the effective carrier lifetime in the depletion region and 3 the hole diffusion length in the base region. Author
- Electrical and Electronic Equipment
- Infrared Detection and Detectors
- Radioactivity, Radioactive Wastes and Fission Products