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The sheets are available in a variety of sizes and can be purchased with or without interleaving paper. In preparation for use, each sheet must be loaded into a cassette or film holder in the darkroom to protect it from exposure to light. The most basic form is as individual sheets in a box. Radiographic film can be purchased in a number of different packaging options. For example, if high resolution and contrast sensitivity is of overall importance, a slower and finer grained film should be used in place of a faster film. Selecting the proper film and developing the optimal radiographic technique usually involves arriving at a balance between a number of opposing factors. Relative importance of high radiographic detail or quick and economical results.Kilovoltages available with the x-ray equipment or the intensity of the gamma radiation.
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See the page on film processing for additional information. It is this silver, suspended in the gelatin on both sides of the base, that creates an image.
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This change is of such a small nature that it cannot be detected by ordinary physical methods and is called a "latent (hidden) image." However, the exposed grains are now more sensitive to the reduction process when exposed to a chemical solution (developer), and the reaction results in the formation of black, metallic silver. When x-rays, gamma rays, or light strike the grains of the sensitive silver halide in the emulsion, some of the Br - ions are liberated and captured by the Ag +Â ions. A few of the films used for radiography only have emulsion on one side which produces the greatest detail in the image. The emulsion layers are thin enough so developing, fixing, and drying can be accomplished in a reasonable time. Putting emulsion on both sides of the base doubles the amount of radiation-sensitive silver halide, and thus increases the film speed. Usually, the emulsion is coated on both sides of the base in layers about 0.0005 inch thick. The emulsion is different from those used in other types of photography films to account for the distinct characteristics of gamma rays and x-rays, but X-ray films are sensitive to light. X-ray films for general radiography consist of an emulsion-gelatin containing radiation sensitive silver halide crystals, such as silver bromide or silver chloride, and a flexible, transparent, blue-tinted base.