The luminescence emission spectra of commercial CaWO4 and BaSO4:Pb phosphors and screens have been measured for excitation with a known x-ray spectrum at 40 kVp. The emission efficiency and quantum yield have been determined. Changes have been observed in the ultraviolet reflection spectrum after the phosphors had received large x-ray exposures. The light emission of these phosphors, when exposed to x-ray excitation, has been studied as a function of irradiation time.
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Grum et al. (1969) studied this question.
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