Comparative Study of Optical and Scintillation Properties of Tm-doped La2Si2O7 and Lu2Si2O7 Single Crystals

We investigated scintillation decay times at different excitation γ-ray energies for commercial luminescent materials such as Ce:LaBr 3 , Eu:SrI 2 , Ce:LYSO [(Y,Lu) 2 SiO 5 ], and Ce:GAGG [Gd 3 (Al,Ga) 5 O 12 ]. Ce:LaBr 3 and Eu:SrI 2 did not show energy dependence, whereas Ce:LYSO and Ce:GAGG exhibited different decay curves at different excitation energies. In these materials, the energy dependence of decay correlated with the nonproportionality of scintillation light yield.

Section: Methodsmentioning

confidence: 99%

Gamma-ray Energy Dependence of Scintillation Decay Time

Yanagida¹,

Watanabe²,

Kato³

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.

“…In this study, we used Lu 2 O 3 -Ga 2 O 3 -SiO 2 glass as the host material. Since some Lucontaining crystalline scintillators including Lu 2 SiO 5 and Lu 2 Si 2 O 7 have a large Z eff and high light yield, (17)(18)(19)(20) Lu 2 O 3 -SiO 2 glass is also expected to show good scintillation properties. Ga 2 O 3 was predicted to play the role of an intermediate (network former) for this glass.…”

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%.