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2,225 results on '"Yanagida, Takayuki"'

172. Scintillation and dosimetric properties of Tb4O7-doped Ca2BO3Cl.

Author

Kawano, Naoki, Kato, Takumi, Nakauchi, Daisuke, Fukushima, Hiroyuki, Takebuchi, Yuma, Shiratori, Daiki, and Yanagida, Takayuki

Abstract

We synthesized calcium borate chlorides (Ca2BO3Cl) with different amounts of Tb4O7 (0.1, 0.5, 1.0%), and investigated photoluminescence, scintillation, and dosimetric characteristics. Photoluminescence and scintillation owing to the electronic transition between 4f levels of Tb3+ were observed, and the 0.1% Tb4O7-doped Ca2BO3Cl exhibited the highest intensity. Further, thermal stimulated luminescence (TSL) glow peaks appeared at approximately 90, 140, and 340 °C from the fabricated Ca2BO3Cl, and the 0.1% Tb4O7-doped Ca2BO3Cl with the largest glow peak intensity exhibited a dose response in the 10–10000 mGy range. Moreover, the fabricated Ca2BO3Cl showed optical stimulated luminescence (OSL) owing to the electronic transition between 4f levels of Tb3+, and three OSL exponential decay components were detected from the fabricated Ca2BO3Cl, suggesting the presence of at least three detrapping processes for OSL. [ABSTRACT FROM AUTHOR]

Published
2024
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173. Optical and Scintillation Properties of Tb-Doped Gadolinium Pyrosilicate Single Crystals.

Author

Kantuptim, Prom, Kato, Takumi, Nakauchi, Daisuke, Pattanaboonmee, Nakarin, Kawaguchi, Noriaki, Watanabe, Kenichi, Chewpraditkul, Weerapong, and Yanagida, Takayuki

Subjects
SINGLE crystals, OPTICAL properties, DOPING agents (Chemistry), HEIGHT measurement, PHOTOLUMINESCENCE, SCINTILLATORS
Abstract

Gadolinium pyrosilicate (GPS, Gd2Si2O7) single crystals with different doping concentrations of Tb (0.1–2.0 mol%) are successfully fabricated using the floating-zone technique. In this work, the dependence of Tb-doping concentration on the photoluminescence (PL) and scintillation properties of Tb-doped GPS (Tb:GPS) has been investigated. The PL emission contour graph shows multiple emissions, with the strongest emissions at 378 nm for 0.1% and 0.5% Tb-doping and 544 nm for 1.0% and 2.0% Tb-doping, corresponding to Tb3+ 4f-4f transitions. The PL lifetimes of the specimens range from 4.89 to 5.22 ms. The scintillation spectra exhibit comparable wavelength and intensity trends to the PL emission. The scintillation lifetimes of the specimens range from 2.41 to 3.88 ms. The Tb:GPS specimens demonstrate a relatively excessive afterglow level, with Af20 values ranging from 1640 to 7250 ppm and Af40 values ranging from 136 to 362 ppm. Using recently developed pulse height measurement for millisecond decay scintillators, under excitation at 662 keV γ-rays, the 1.0% Tb:GPS specimen exhibits the highest scintillation light yield among all other specimens at 95,600 ph/MeV, making Tb:GPS one of the highest light yield oxide scintillators. [ABSTRACT FROM AUTHOR]

Published
2024
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