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Abstract
BaFBr:Eu 2+ is a commercial storage phosphor which is widely used in medical X-ray diagnostics, replacing conventional photographic film. The BaFBr crystals were grown by the Shteber method in a graphite crucible in helium–fluorine atmosphere in order to reduce oxygen contamination. The stoichiometric mixtures of BaBr 2 and BaF 2 were used. All samples were doped with 0.1 mol% of Eu 2+, the concentrations of alkali in the crystals are 0.0002–0.01%. The X-ray storage phosphor BaFBr:Eu 2+ doped with alkali impurities (Na +, K +, Rb +) gives a photostimulated spectrum shifted to the lower photon energies. The photostimulation luminescence (PSL) intensity considerably increases compared to BaFBr:Eu 2+ upon room-temperature X-ray irradiation. This redshift of the photostimulation spectrum is caused by formation of F A-centers in the Br − sublattice as electron traps.
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