INFLUENCE D'UN TRAITEMENT THERMIQUE SUR LA SENSIBILITÉ D'ÉMULSIONS AgBr PRIMITIVES
Université de Liège, Laboratoire de Physique générale, Sart Tilman, B-4000 Liège, Belgique.
Abstract
The temperature dependence of sensitivity was studied in unsensitized and undyed emulsions containing octahedral or cubic silver bromide grains of uniform size (0.4 or 0.8 (10-6 m) in a relatively inactive-gelatin layer. The samples were heated up to 200 °C before exposure at room temperature. It was shown that the surface sensitivity increased up to 75 °C but decreased over 120 °C. In the same range of temperatures the internal sensitivity increased slowly and the deep one decreased. The significant experimental results can be summarized as follows : the sensitivity is thermally affected by changes in temperature storage before exposure and increasing temperature can result in a shifting of sensitivity from the interior to the surface of the grains.
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