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Film Radiography
The image capturing is another important aspect of radiography. The most common method is capturing images on film. Radiographic film consists of a thin, transparent, plastic sheet coated on one or both sides with an emulsion of gelatin approximately 0.001-in. thick that has very fine grains of silver bromide. When this film is exposed to X-rays, gamma rays, or visible light rays, the silver bromide crystals undergo a reaction that makes them more susceptible to the chemical process (called developing) that converts them to black metallic silver. In other words, exposure to radiation creates a latent image on the film, and further chemical processing makes the image visible.
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