Growth, Optical, and Scintillation Properties of (Gd0.4Lu0.6)8Sr2(SiO4)6O2 Crystals

In this study, Mg 1.995−x SiO 4 :xCe, 0.005Tb (x = 0 and 0.01) single crystals were synthesized by the floating zone method and their photoluminescence (PL) and dosimetric properties were evaluated. In the PL process, emission peaks due to the 4f-4f transitions of Tb 3+ ions were observed in the x = 0 and 0.01 samples, and the emission peak due to the 5d-4f transitions of Ce 3+ ions was detected in the x = 0.01 sample. In the thermally stimulated luminescence (TSL) process, only emission peaks due to the 4f-4f transitions of Tb 3+ ions were observed in both samples, and the x = 0.01 sample had higher TSL intensity than the x = 0 sample. The x = 0.01 sample showed a lower detection limit of 0.01 mGy and a spatial resolution of 50.0 μm under X-ray irradiation.

Section: Resultsmentioning

confidence: 99%

Analysis of Photoluminescence and Dosimetric Properties of (Ce, Tb)-codoped Magnesium Orthosilicate Single Crystals

Ichiba¹,

Takebuchi²,

Kimura³

et al. 2023

“…Since the properties of scintillators have a significant impact on the performance of radiation detectors, there have been many theoretical and experimental studies on them over the past couple of decades. (1)(2)(3)(4)(5) They are still continuing to be studied, and various scintillators such as organic, (6) organic-inorganic hybrid, (7)(8)(9) and inorganic materials including fluorides, (10) chlorides, (11)(12)(13) bromides, (14,15) iodides, (16) and oxides (17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28) have been investigated over the last few years. In particular, oxide scintillators have attracted considerable attention owing to their excellent chemical stability.…”

Section: Introductionmentioning

confidence: 99%

Scintillation Light Yields of Tb-doped SiO2 Glasses

Kawaguchi¹,

Watanabe²,

Shiratori³

et al. 2023

We investigated the scintillation light yields of Tb-doped SiO 2 glasses. We prepared 0.05, 0.1, and 0.5% Tb-doped SiO 2 glasses by melting and solidifying sintered ceramic rods using an oxygen burner. The obtained samples showed no crystalline phases in X-ray diffraction measurements. Pulse height spectra of the Tb-doped SiO 2 samples were measured under γ-ray excitation using a measurement system for slow decay pulses. The number of channels at the Compton edge of the 0.5% Tb-doped sample was the highest and was approximately 50% of that of a commercial lithium glass scintillator (GS20). By considering the light yield of GS20 and the wavelength dependence of the quantum efficiency of the photomultiplier tube, the light yield of the 0.5% Tb-doped SiO 2 sample was estimated as 3800 photons/MeV.

“…No scintillator yet meets all of these requirements, and many researchers are investigating novel scintillators. (4)(5)(6)(7)(8)(9)(10)(11) In the case of X-or γ-ray detection, the main interaction between the ionizing radiation and the scintillator is the photoelectric effect, and the cross section is proportional to the fifth power of Z eff . (12) Therefore, a large Z eff is important for high-energy X-or γ-ray detection.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Lu2O3-Ga2O3-SiO2 Glass as a New Glass Scintillator

Takebuchi¹,

Shiratori²,

Kato³

et al. 2023

We synthesized 20Lu 2 O 3 -30Ga 2 O 3 -50SiO 2 glasses doped with various concentrations of Sn using a floating zone furnace equipped with Xe arc lamps. The samples showed a luminescence band around 450 nm in both photoluminescence (PL) and scintillation spectra. The origin of the luminescence was ascribed to the T 1 -S 0 transition of Sn 2+ on the basis of the luminescence wavelength and PL decay time constant. The highest scintillation intensity and PL quantum yield were observed from the 1% Sn-doped sample. The afterglow level tended to decrease with increasing Sn doping, and the afterglow levels of the 1 and 3% Sn-doped samples were comparable to that of the conventional Tl-doped CsI scintillator. The optimal concentration of Sn for the glass was estimated to be 1%.