Abstract
A determination of the infra-red spectral response of a copper-activated zinc cadmium sulphide phosphor at normal and at liquid air temperatures is described. Peaks in sensitivity at wave-lengths of 2·1 and 2·7
μ
are observed directly for the first time and are correlated with glow-curve data. The incidence of room temperature radiation on a phosphor at liquid air temperature is shown to make the observation of sensitivity beyond 3
μ
impracticable.
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