Controlled site epitaxial sensitization of limited iodide silver

Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing

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430569, 430570, 430581, 430591, G03C 102, G03C 112

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active

044630875

ABSTRACT:
Silver halide emulsions of limited iodide content, processes for the preparation of these emulsions, photographic elements incorporating these emulsions, and processes for the use of the photographic elements are disclosed. In the emulsions silver halide grains predominantly bounded by {111} crystal faces and containing insufficient iodide to direct silver salt epitaxy to selected surface sites of the grains are present. Silver salt is epitaxially located on and substantially confined to selected surface sites of the silver halide grains, this being accomplished by the use of an adsorbed site director.

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Shiozawa, "Electron Microscopic Study on Conversion of Silver Halides I & II", Bulletin of the Soc. of Photo. Science and Technology of Japan, No. 22, Dec. 1972, pp. 6-20.
Klein, et al., "Untersuchung uber die Konvertierung der Silberhalogenide", Photo. Korr., 102, pp. 59-63, (1966).
Steigmann, Photographische Industrie, "Green- and Brown-Developing Emulsions", vol. 34, pp. 764, 766 and 872, published Jul. 8 and Aug. 5, 1938.
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Suzuki and Ueda, "The Active Sites for Chemical Sensitization of Monodisperse AgBr Emulsions", 1973, SPSE Tokyo Symposium.

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