Thermally stimulated luminescence (TSL), optically stimulated luminescence (OSL), and radio-photoluminescence (RPL) are radiation-induced luminescence phenomena, and they are widely used for radiation dosimetry today. Despite their successful applications, the R&D of conventional and new phosphor materials is still actively performed in a wide range of research fields from basic science to application. Although these phenomena are considered to be different, they share common physical processes such as the generation, trapping, and transfer of electronic charges. In order to have a deeper look into these phenomena, it is important to comprehensively characterize those of a single material. For this, we have constructed a prototype TSL/OSL/RPL automated and integrated measurement system (TORAIMS), and then the system performance has been studied. The system offers automated and integrated measurement of several different TSL, OSL, and RPL properties, and it is also designed to cover many different phosphor materials having a wide variety of spectroscopic properties.
A glass phosphor is an attractive material for applications in radiation detection because of its high workability and availability with a wide range of chemical compositions. Recently, the X-ray-induced luminescence of glasses containing various luminescent activators has been actively investigated worldwide. Among them, glass that exhibits the radio-photoluminescence (RPL) phenomenon is a promising material for not only dosimetry but also X-ray imaging applications. However, there are only a few materials that exhibit the RPL phenomenon, and thus there is room for material exploration. In this study, we found that Ag 2 O-R 2 O-BaO-Al 2 O 3 -P 2 O 5 (R = K, Rb, Cs) glass, in which some of the constituents of the commercial RPL glass were replaced with heavy elements, shows RPL properties worthy of practical application. Our glass specimens have a spatial resolution of at least 8 LP/mm; furthermore, the fading of the emission from RPL centers was much lesser than that from commercial imaging plates.
Nd-doped LuVO 4 single crystals were synthesized by the floating zone method and their optical properties including scintillation were evaluated. The synthesized Nd-doped LuVO 4 samples had a LuVO 4 single phase. The 1.0% Nd-doped LuVO 4 had the highest photoluminescence (PL) quantum yield (87%) of all the samples in the NIR range. The Nddoped LuVO 4 samples showed scintillation peaks around 900, 1060, and 1320 nm due to the electronic transition of Nd 3+ . Moreover, there was a strong correlation between the scintillation signal intensity and the X-ray exposure dose rate in the wavelength range from 900 to 1600 nm, and all the samples showed good linearity with a dynamic range from 0.006 to 60 Gy/h.
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