film, rad
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| observable difference between x-ray film and photographic film is | thickness and rigidity of the base
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| principal characteristic of the emulsion that makes it particularly x-ray sensitive is its | sensitivity center
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| average silver halide crystal surface size in radiographic film is | 1.0 um
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| radiographic film base appears blue because | a tint is added to make viewing more comfortable
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| celluslose nitrate and cellulose triacetate are used in what component of film | in the film base
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| emulsion that is commonly used in x-ray film consists of | silver halide and gelatin
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| common base in contemporary x-ray film | polyester
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| ensures uniform contact of the emulsion to the base | adhesive layer
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| the overcoat of film usually consists of? | gelatin
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| in film, dimensional stability is the property of maintaining the size and shape of | the base
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| principle purpose of gelatin in film emulsion | support the silver halide crystals uniformly
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| most important property of silver halide in production of the latent image | atomic number
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| x-ray film is sensitive to | x-rays, gamma rays, visible light
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| x-ray film used in radiographic intensifying screens usually has what type of emulsion | emulsion coat on both sides of the base
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| silver bromide is a principal component of what | the silver halide crystals in the emulsion
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| the latent image is formed where | silver halide crystals
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| during the photographic process, metallic silver accumulates where | sensitivity center
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| a collection of silver atoms in the latent image occurs | at the crystal level
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| the sensitivity center is silver __________ | sulfide
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| what additive/impurity is added to emulsion to form sensitivity specs | AgBr (silver sulfide)
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| image-forming and remnant are referred to as | the radiation exiting the patient that is responsible for the latent image formation
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| the interstitial atoms in a crystal of silver halide are | silver, bromide, iodine
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| the formation of the latent image follows what interaction with the emulsion | photoelectric effect
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| theory that best explains the photographic effect | gurney-mott theory
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| the difference between fast film and slow film is silver halide crystal __________ | concentration
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| the spectral response of an emulsion refers to | absorption of visible light
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| calcium tungstate screen emit what type of light | blue and blue-violet light
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| factors that can cause fog | darkroom light leak, background radiation, humidity, temperature
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| orthochormoatic film is sensitive to what light? | green light
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| rare earth films require what color safelight | red
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| describe mammography film | fine grain film used with a screen
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| most rare earth screen emit what color light | ultraviolet, blue, green and red
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| what are the optimal temps and humidity for storing film | 20C/68F or lower with 30-60% humidity
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| film resolution is determined by | size of silver halide crystals
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| smaller crystals result in what type of resolution | higher resolution
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| silver halide crystals are sometimes called | grains/graininess
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| film sensitivity is determined by these factors | silver halide crystal size, number of sensitivity specs and thickness of emulsion layer
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| compare film speed of smaller crystals vs larger crystals | smaller = slower film speed
larger = faster film speed
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| compare film speeds related to emulsion thickness of thick vs thin | thick = faster film speed
thin = slower film speed
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| what are the primary characteristics of film | resolution, contrast, speed, latitude
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| ability of film to stop light is termed | opacity
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| instrument that provides a readout of the amount of density (blackening) on a film | densitometer
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| type of sensitometric equipment sometimes referred to a step wedge, increasingly thick, uniform absorbers | penetrometer
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| measurement of the characteristic response of film exposure and processing? | sensitomertry
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| as contrast increases what happens to the latitude? | decreases
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| what component makes silver halide crystals photosensitive? | sensitivity specs
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| inherent object unsharpness refers to? | constant motion (ie heart)
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| as the OID increases the detail becomes? | less sharp
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| as the SID increases detail becomes? | sharper
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| as the OID decreases the details become? | sharper
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| the most important consideration in selecting screen-film is? | the spectral absorption characteristics
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