<atl>Development of a functional equation to correct fading in imaging plates

The time evolution of PSL in certain photo stimulable phosphors has been studied for several storage temperatures ranging from <f>0°C</f> to <f>60°C</f> and for time periods from 0.03 to approximately <f>500 h</f> after irradiation. The experiments were carried out using commercially available BaFBr:<f>Eu2+</f> phosphors: BAS-UR and BAS-TR (Fuji Film Co.).The fading curves obtained after irradiation with a <f>244Cm</f> source were analyzed by applying Arrhenius’ equation to the experimental results, the same method reported previously (). An improved equation, which is a function of elapsed time (<f>t</f>) and absolute temperature (<f>K</f>), was proposed. Comparison of the data of the experiment and calculated results based on a model consisting of four components for BAS-UR and five components for BAS-TR showed excellent agreement at all temperatures and over all time periods.The formula was also confirmed as giving the proper calculated photo-stimulated luminescence (PSL) corresponding to the temperature changes between the elapsed times, and showed good consistency with the experimental results. [Copyright &y& Elsevier]