crystal, fluorapatite

(redirected from silver halide crystal)

crystal, fluorapatite (flŏŏrap´ətīt),

n the crystalline structure that occurs after hydroxyapatite changes into fluorapatite as a result of the tooth being exposed to fluoride.
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Cryptococcosis.
crystal gold,
crystal, silver halide
n the silver compounds, usually silver bromide and silver iodide, that are impregnated in the photographic emulsion of film. These compounds, when acted on by actinic rays, are disintegrated, with the formation of metallic silver in a finely divided state. The photographic image results when the film is subjected to processing.
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The light from your scene actually changes the electrical charge in each silver halide crystal, making an invisible image, or latent image, that is sensitive to film developer (a chemical used to develop film).
The challenge exists because of the process by which an image is captured on film -- a photon strikes a silver halide crystal and an electron is released.
The only acceptable form of processing that may be used for photographic film for images of information having permanent value involves subjecting the exposed film to a developing bath that converts sensitized silver halide crystals to metallic silver.
The silver halide crystals in photographic emulsions become exposed when a certain number of photon hits occur within a given time frame.
Previously, if you needed a faster film, the only way to get it was to incorporate larger silver halide crystals into the design.