Latent Image Distribution in Evaporated Layers of Silver Bromide

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Abstract
The distribution of development specks throughout the depth of evaporated layers of AgBr has been followed by means of graded dissolution. Nonsensitized layers were shown to build on exposure only internal latent image, with slightly higher concentration in the subsurface region. Negative imaging layers—gold-iridium sensitized, as well as direct positive layers—prefogged by vacuum deposition of silver specks have also been studied. Gold-iridium sensitization creates a reasonable photoresponse of the surface and increases to some extent the sensitivity of the subsurface region, leaving the volume practically unchanged. It is argued that one role of the sensitizer is to bind irreversibly the bromine equivalent created on exposure. The silver specks created by vacuum deposition are quite unstable and show a marked tendency to diffuse in the interior of the layers, probably along the interface boundaries. The photographic response in the interior of these layers depends on the intensity of exposure.

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