12Sensitive Materials and Image Sensors

Many light-sensitive substances, varying widely in their sensitivity, are known. Conventional photographic materials use silver halides, which are light-sensitive compounds formed by the combination of silver with members of the halogen group of the elements (bromine, chlorine and iodine).

Photographic materials are coated with suspensions of minute crystals (with diameters from 0.03 μm for high-resolution film to 1.5 μm for a fast medical X-ray film) of silver halide in a binding agent, nowadays almost invariably gelatin. These photographic suspensions are called emulsions, although they are not emulsions but solid suspensions. The crystals are commonly termed grains. In materials designed for the production ...

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