Coincidence Counter Models with Applications to Photographic Detection Theory

Various types of counter models have been treated in the literature over the past twenty years. In all these models the counter mechanism involves a fixed or random dead time following a registered event. In this paper a different type of counter mechanism is introduced in which the occurrence of two or more input events within a relatively short time is required to produce a registered (output) event. This model of an “R-fold coincidence counter” is applied to the development of grains in a photographic emulsion for both low-intensity and high-intensity reciprocity failure.