New photostimulable phosphor materials for an imaging plate of computed radiography

The photostimulated luminescence (PSL) characteristics of alkali halide phosphors, such as KCl:Eu, KBr:Eu and KCl x Br 1-x :Eu phosphors, as new storage photostimulable phosphor materials for the imaging plate in computer radiography are investigated. Intense 420 nm PSL is observed in X-ray-irradiated KCl x Br 1-x :Eu phosphor. The PSL intensity increases linearly with increasing X-ray irradiation dose over the wide range, showing a good storage material for the imaging plate in computed radiography. The KBr:Eu phosphor exhibits excellent fading characteristics, which showing that the KBr:Eu phosphor is useful as a material for medical imaging utilizing PSL phenomenon. The mechanism of the fading is also discussed.