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a substance that is easily penetrated by the xray beam


radiation from the cassette back and cassette tray that is directed back toward the film

film/screen contact

the tightly pressing of the intensifying screen against the film when the cassette is closed


as phosphers glow, giving off light when exposed to xrays


fluorescent crystals in the surface of an intensifying screen

screen speed

the effiency of a screen in converting xrays to light

rare earth phosphors

crystals containing either gadolinium, lanthanum, or yttrium


unwanted marks or images on the radiograph

spectral emission

the color of light emitted by a phospher

silver halide

silver salts of the halogen elements that are mixed with gelatin to form the film emulsion

spectral sensitivity

the portion of the electromagnetic spectrum to which the the film is most sensitive

sensitometric curve

an s shaped curve that demonstraiong the the response of a film to a full range of exposure


the maximum density on a sensitomatic curve

optical density (OD)

a numerical representation of the films ability transmit light

base + fog density

the measue of light absorbed by the film base plus any fog exposure to the film before processing


the term used to describe the range of densities that can be recorded on an xray film

straight-line portion

the portion of the graph that is in a realativity straight, vertical position and indicates film speed

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