Abstract
Photographic film was exposed to γ-rays from 226Ra and 60Co to levels of 5 mR to 5,000 R. Measurements of the Ag in the developed films by both (a) activation with neutrons from 252Cf and counting 110Ag (half life 24.4 sec) and (b) X-ray fluorescence correlated with the known exposures. In the lower ranges conventional optical density measurements were made, and the correlation with the activation and X-ray methods was good.
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