target-film distance
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Related to target-film distance: penumbra
tar·get-film dis·tance
(TFD) (tahrgĕt-film distăns)The space measured from the focal point of an x-ray tube to the film.
Synonym(s): source-film distance.
Synonym(s): source-film distance.
Medical Dictionary for the Dental Professions © Farlex 2012