Radiation storage phosphor and applications

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The present invention relates to a photoexcitable storage phosphor which comprises at least one rare earth element in the trivalent +3 oxidation state and wherein upon irradiation by Xray, "I-ray or UV radiation the trivalent +3 oxidation state is reduced to divalent +2 oxidation state. The present invention also relates to a dosimeter, radiation image storage panel comprising the phosphor of the present invention and in dosimetry applications for applications including scientific, medical and other imaging applications. The present invention also relates to a process for making a photoexcitable storage phosphor and a process for recording and reproducing an image. Wavelength/rim Photoexcited (488 nm Ar+ laser line) luminescence of Sm 2÷ after X-ray irradiation of BaCIF : Sm prepared according to example 2 in the text. None of the narrow SDj-TFj luminescence lines are present in un-irradiated samples.