AFTERGLOW CHARACTERISTICS OF AN X-RAY-IRRADIATED IMAGING PLATE

The effect of time and temperature dependence of the afterglow intensi ty are measured for several kinds of commercial imaging plates compose d of BaFBr0.85I0.15:Eu2+ and BaFBr:Eu2+. Emission spectra of the after glow reveal a single band with a maximum around 400 nm. It is found th at the afterglow intensity is usually increased with increasing temper ature. The time dependence of the afterglow is analysed using a recomb ination model particularly in relation to the temperature and the dist ance between electrons and holes. It is shown that theoretical curves with three reasonable parameters are in good agreement with the experi mental data. A relation between afterglow and fading is also discussed using the proposed recombination model.