2010 Volume 59 Issue 2 Pages 81-91
The effect of simultaneous exposure with filtered ultraviolet(UV)light and fluorescent(FL)light on unerasable latent images in imaging plates(IPs) was investigated by using three types of IP samples(BAS-TR, BAS-MS, and ST-VI). The IP samples were irradiated with 10MV and 80kV X-ray beams, ranging from 0.987Gy to 291Gy and 53.5μGy to 1.028Gy, respectively, and erased by repeating simultaneous exposure with both lights. All unerasable latent images were completely erased and reappearing PSL signals were not observed after the storage at 0°C for 20days. It was found that unerasable latent images in ST-VI samples needed the most rounds of exposure until they were erased completely because of protective layer and thicker phosphor. Unerasable latent images erased with FL light only were not erased completely and reappearing PSL signals were slightly observed after the storage at 0°C for 20days.