The response of Kodak DEF and CEA Reflex 25 direct-exposure X-ray films to Cu Kα X-rays is reported for optical densities between 0 and 3.0. A simple general procedure for exposing films, calibrating the microdensitometer and analyzing response is presented. Conditions have been determined for obtaining uniform development with maximum signal/film-background ratio. From the experimentally determined dose-response curves, useful data can be extracted from higher optical density (OD) readings than are traditionally used and/or the accuracy of the data can be increased.
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W. C. Phillips (1985) studied this question.
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