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Abstract
The first part of the paper reviews the problem of radiation detection by the photographic layer. It is concluded that the exposure-dependent signal-to-noise ratio, rather than the exposure-dependent DQE, should be regarded as the physically significant quantity in this connection.
The main part is concerned with the contribution of quantum noise to granularity. It will be shown that for photographic layers, regarded as ensembles of independent on-off detectors, there actually does not exist any direct contribution of quantum noise to granularity. Nevertheless, one may derive some information of the spatial distribution of exposure quanta from the granularity pattern, provided that one has an a priori knowledge of the response characteristic of the average grain.