Sulphur Sensitization of Photographic Emulsions. II. The Spectral Sensitization

Frieser, H.; Bahnmüller, W.

doi:10.1080/00223638.1968.11737432

Cited by 2 publications

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Silver Halide Detector Technology

Hailstone¹

2002

Encyclopedia of Imaging Science and Technology

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This article describes the basic construction and operation of silver halide materials as image recording devices. The detector consists of silver halide microscrystals coated in a gelatin–water mixture on either a transparent or paper support. Strictly speaking the resulting suspension of silver halide microcrystals in aqueous gelatin is classified as a dispersion but early on in the development of photography it was called an “emulsion.” Emulsion is used in this article. A latent image is formed via a photochemical change of the microcrystal. The visible image is created through an image processing step in which those microcrystals that have received sufficient light “blacken” as they are transformed from silver halide to metallic silver. The microcrystals, also called “grains,” are prepared in a variety of shapes and size distributions to accommodate a variety of applications. Over the range of applications, the microcrystal size varies from a few tenths of a micron diameter to several microns diameter. Sensitivity, or speed, increases with increasing grain size, so higher speed films must necessarily use larger grains. Materials intended for image capture need to produce a distinguishable output over a wide range of inputs arid so a polydisperse size distribution is used. On the other hand, materials for image display, such as prints, need to respond only over a relatively narrow range of inputs so a monodisperse size distribution is often used.

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