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What is the relationship between film screen speed and radiographic detail?
Wiki User
∙ 15y ago
Film speed is related to the size of the silver halide crystals in the emulsion or to the thickness of the silver halide layer. X-rays are more likely to interact with a large crystal or the increased number of crystals in a thicker layer. Fast films (high speed) have larger crystals or thicker layers. Slow films have smaller crystals or thinner layers. The image detail is inversely related to the speed; that is, detail is greater with slow films because the area exposed by each x-ray is smaller (less amplification conferred by each x-ray).
In other words, information from the patient (in the form of an x-ray) will be deposited over a smaller area with slow film, so detail will be better. However, more radiation will be necessary because the probability of an x-ray leaving the patient and hitting the crysal will be less with small crystals than with large ones.
Hope this helps :-)
Wiki User
∙ 15y ago
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