Luminescence and dose-rate response properties of Pr-doped Bi4Ge3O12 scintillators. (June 2022)

• Record Type: Journal Article
• Authors: Okazaki, Kai; Fukushima, Hiroyuki; Nakauchi, Daisuke; Okada, Go; Onoda, Daichi; Kato, Takumi; Kawaguchi, Noriaki; Yanagida, Takayuki
• Is Part Of: Radiation measurements. Volume 154(2021)
• Publication Date: 2022-06
• Subjects: Scintillator -- Photoluminescence -- Floating zone method -- Dose-rate response -- Afterglow; Nuclear emulsions -- Periodicals; Particle tracks (Nuclear physics) -- Periodicals; Thermoluminescence -- Periodicals; Cosmic rays -- Periodicals; Radiation -- Measurement -- Periodicals; Radiometry -- Periodicals; Radiation Monitoring -- Periodicals; Émulsions nucléaires -- Périodiques; Particules (Physique nucléaire) -- Traces -- Périodiques; Thermoluminescence -- Périodiques; Rayonnement cosmique -- Périodiques; Radiométrie -- Périodiques; 539.77
• DOI: 10.1016/j.radmeas.2022.106773
• Languages: English
• ISSNs: 1350-4487

Abstract

Abstract: In recent years, there has been increasing demand for a scintillator showing near-infrared (NIR) luminescence owing to the potential for radiation monitoring applications. In this study, Pr-doped Bi4 Ge3 O12 (BGO) single crystals were prepared by the floating zone method to explore candidates as a NIR scintillator, and the luminescence and dose-rate response properties of Pr-doped BGO were studied. Both photoluminescence and scintillation peaks appeared at 400–600 nm due to Bi 3+, and sharp emission peaks by Pr 3+ were also confirmed at 480–1100 nm, with consistent decay times. Further, to investigate performance as a scintillation detector, a linearity of the response to X-ray exposure dose rate was evaluated. Among the samples, the 0.5% Pr-doped BGO showed the highest sensitivity with the lowest detection limit of 0.006 Gy/h. Highlights: ● Pr-doped Bi4 Ge3 O12 single crystals were grown by the floating zone method. The emission due to Pr3+ 4f–4f transitions was observed in the visible–NIR range. The NIR scintillation intensity was proportional to the X-ray exposure dose rate. The lowest detection limit was 0.006 Gy/h when the 0.5% Pr-doped sample was used.