Undoped and Tm-doped NaMgF 3 single crystals were synthesized and investigated in terms of their scintillation and optically stimulated luminescence (OSL) properties. The synthesized samples were confirmed by X-ray diffraction to be a single-phase NaMgF 3. The Tm-doped sample showed an X-ray-induced scintillation spectrum characterized by sharp emission lines owing to the 4f-4f transitions of Tm 3+. The OSL spectrum of the Tm-doped sample also showed emission at around 360 nm, which was ascribed to the 4f-4f transitions of Tm 3+. The OSL dose response function of the Tm-doped sample showed a linear response in the dose range of 1-10000 mGy.

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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.

We fabricated Pr 3+ -activated glasses having a composition of 10SrO-5Al 2 O 3 -85TeO 2 (PSAT) for potential use as radiation detectors, and their photoluminescence (PL) and X-ray-induced scintillation properties were then characterized. The PSAT glasses showed several emission peaks in their PL spectra owing to the 4f-4f transitions of Pr 3+ . Furthermore, they exhibited typical PL decay times (0.09-0.86 ms), where the decay originated from the 4f-4f transitions of Pr 3+ . In the scintillation spectra of the PSAT glasses, three peaks at approximately 480, 618, and 636 nm were observed. The scintillation decay times were 0.747-0.840 ms, corresponding to the 4f-4f transitions of Pr 3+ . Furthermore, the PSAT glasses showed afterglow levels of 352-521 ppm, and the lowest afterglow level (352 ppm) was comparable to that of Tl-activated CsI single crystal.

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Undoped, 0.5, 1.0, and 2.0% Nd-doped Bi4Si3O12 (BSO) crystals were synthesized by the floating zone method. Regarding photoluminescence (PL) properties, all samples had emission peaks due to the 6p–6s transitions of Bi3+ ions. In addition, the Nd-doped samples had emission peaks due to the 4f–4f transitions of Nd3+ ions as well. The PL quantum yield of the 0.5, 1.0, and 2.0% Nd-doped samples in the near-infrared range were 67.9, 73.0, and 56.6%, respectively. Regarding X-ray-induced scintillation properties, all samples showed emission properties similar to PL. Afterglow levels at 20 ms after X-ray irradiation of the undoped, 0.5, 1.0, and 2.0% Nd-doped samples were 192.3, 205.9, 228.2, and 315.4 ppm, respectively. Dose rate response functions had good linearity from 0.006 to 60 Gy/h for the 1.0% Nd-doped BSO sample and from 0.03 to 60 Gy/h for the other samples.