Abstract
Even though image plate technology is successfully applied in x-ray detection, many questions concerning its detailed functional mechanisms have still not been answered. In this paper it will be shown that a previously suggested non-stoichiometric monophase of BaF1.12Br0.88 : Eu2+ resulting from the BaF2/NH4Br preparation route cannot be supported. It will be demonstrated by x-ray analysis that depending on the starting ratio of BaF2 to NH4Br during sintering or the already synthesized BaFBr : Eu2+ to BaF2 during annealing, stoichiometric BaFBr : Eu2+ with or without a BaF2 phase will always be obtained. Furthermore, it will be shown that in the case of a molar stoichiometric starting ratio of BaF2/NH4Br, partial sublimation of NH4Br during sintering can be hold responsible for the appearance of BaF2 as a second phase. Rietveld refinement is utilized to derive the quantitative amount of the individual phase compositions of BaFBr : Eu2+ and BaF2. In terms of image plate properties, it will be shown that the composition of BaFBr : Eu2+ and BaF2 after the high temperature treatment determines the type of photostimulable colour centre generated during x-irradiation. Finally, the results obtained will be interpreted in terms of published photostimulated luminescence formation models.
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