Abstract
Abstract Thin RPL glass plates of different thicknesses from 170 to 1000 μm were fabricated by melting and polishing processes. The property of thin RPL glass plate was investigated by an RPL readout system based on a laser scanning microscope and a photon counting detector. The spatial resolving power of RPL image mapping was about 3 μm, owing to the limitation of laser spot size. Absorbed dose for low-energy photons generated from a 25 kV X-ray tube was effectively measured with a set of thin RPL glass plates. In a microscopic dose measurement, RPL images for alpha-rays were obtained using thin RPL glass plates. The signal-to-noise (S/N) ratio of RPL intensity was related to the determining RPL from photoluminescence. The use of thin RPL glass plate effectively improved the S/N ratio owing to reduction of the fraction of intrinsic photoluminescence in the photon counting. Therefore, the highest-contrast image for alpha-ray irradiation was successfully obtained with the thinnest RPL glass plate.
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