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Europium‐activated barium halides, especially BaFBr : Eu are used as photostimulable x‐ray phosphors in computerized radiography. The kinetics of the photostimulated luminescence (PSL) has been investigated. The measurements support the mechanism of PSL involving F + ↔ F and Eu 2 + ↔ Eu 3 + centers as proposed by Takahashi et al. (1, 2). Values for the cross section of optical excitation of trapped electrons and for the calculated oscillator strength have been determined.
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Leeuw et al. (1987) studied this question.
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