A novel disk-type X-ray area imaging detector using radiophotoluminescence in silver-activated phosphate glass

We report a novel two- and three-dimensional (2-D, 3-D) imaging detector based on the radio-photoluminescence (RPL) phenomenon in silver-activated phosphate glass (PG:Ag) and evaluate its dosimetric characteristics. A compact disk-type PG:Ag detector with a diameter of 80 mm was rotated at a rate of 400 rpm to read out the accumulated dose information and then remove the images for reuse. After X-ray exposure, three RPL dosimeter processes, i.e., preheating, reading, and erasing, were carried out with only a UV laser at 375 nm by adjusting the stepwise output levels. The 3-D images and dose distributions were rapidly reconstructed with a high spatial resolution of 1 mu m and a sensitivity of 1 mGy. (C) 2012 Elsevier Ltd. All rights reserved.