Abstract
AbstractPhotographic emulsions are found to have experimentally-measured detective quantum efficiencies with peak values of less than 3%. Although such low values have been demonstrated to be not far removed from the highest values attainable with high-latitude on/off detectors of the silver halide type, they have nevertheless given rise to widely conflicting opinions concerning the influence on photographic granularity of the photon fluctuations in the exposure. This is essentially due to the complexity of the photographic process, which obscures the statistical processes which are inherent to the input/output relationship of the photon/grain interaction.General arguments are developed which indicate the inevitability of a causal relationship between photon noise and granularity. Calculations are made of the quantitative contribution to detector noise from the photon fluctuations for a hypothetical detector having intrinsic properties which approximate to those of practical photographic emulsions.
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