Abstract

Given the photographic response curves characteristic for any two types of radiation, it is possible to predict the course of the density-versus-exposure curves produced by the two types of radiations in succession, and thus, tentatively, to draw conclusions as to the behavior of the latent image. The results of successive exposures to x and gamma radiation of different photon energy and intensity, to gamma radiation and visible light, and to visible light and infrared radiation show that—after some initial transition phenomena—the shape of the density-versus-exposure curve is essentially the same as that of the curve corresponding to the second type of exposure, administered alone. In the region of transition, changes in the curve shape may occur which suggest transformations of the latent image, leading to photographic sensitization, desensitization, or reversal. Some of the double-exposure effects found in the literature are discussed in relation to the data presented here.

© 1961 Optical Society of America

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