Abstract
Calculations are carried out for the theoretical limits of sensitivity of lead salt photo-conductive cells, on the basis of fluctuations in the room temperature radiation quanta falling on the cell. The results show a marked dependence on the temperature of the layer, and on the form of the spectral sensitivity curve.Using cooled detectors exposed to room temperature radiation, it should be possible to detect 8×10−14 watt at 2.9μ with PbS, and 9×10−13 watt at 5.0μ with PbTe.
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