Optical and Scintillation Properties of Eu-doped CsBr–BaBr2–ZnBr2 Glasses

Lanthanum pyrosilicate La 2 Si 2 O 7 (LaPS) single crystals were successfully fabricated by the floating zone (FZ) method with Tb doping concentrations of 0.1, 0.5, 1.0, and 2.0% for scintillation and photoluminescence (PL) study. X-ray diffraction patterns of the samples indicate a single phase of LaPS from their consistency with the reference pattern. Tb-doped LaPS has multiple emissions from Tb 3+ 4f-4f transitions including those at 380, 420, 440, 480, 540, 590, and 620 nm, as observed in both PL and X-ray-induced scintillation spectra with a PL quantum yield of up to 50.1%. The PL and scintillation decay time constants obtained were 2.64-3.26 and 1.54-2.00 ms, respectively. In 137 Cs (662 keV) γ-ray pulse area spectra, the 1.0% Tb-doped LaPS had the highest scintillation light yield of 47700 ph/MeV. From all the results in this study, the optimum Tb doping concentration in LaPS single crystals is considered to be 1.0% for scintillator application.

Section: Introductionmentioning

confidence: 99%

Optical and Scintillation Characteristics of Tb-doped La2Si2O7 Single Crystal

Kantuptim¹,

Kato²,

Nakauchi³

et al. 2023

“…Scintillators convert ionizing radiation into visible-UV photons, and they have been widely utilized to measure ionizing radiation in the fields of security, (1) medical imaging, (2,3) and resource exploration. (4,5) In general, required properties of scintillators include high scintillation output, short decay time, high energy resolution, and high effective atomic number; however, since no materials currently satisfy the requirements of all applications, R&D has been performed continuously on scintillators in various forms such as single crystals, (6)(7)(8)(9)(10)(11) ceramics, (12)(13)(14) films, (15,16) glasses, (17)(18)(19)(20)(21)(22)(23) and liquids. (24)(25)(26) Our research has focused on rare-earth-activated alkali-earth aluminates, which have been intensely studied in phosphor fields (27)(28)(29) ; in particular, Eu,Dy-co-doped SrAl 2 O 4 is a wellknown long-lifetime phosphorescent material.…”

Section: Introductionmentioning

confidence: 99%

Radiation-induced Luminescence Properties of Ce-doped SrAl2O4 Crystal and Translucent Ceramic

Nakauchi¹,

Nakamura²,

Kato³

et al. 2023

A comparative study on the radioluminescence properties of Ce-doped SrAl 2 O 4 single crystal and translucent ceramic was performed. The transmittance of the synthesized ceramic is 20-30% in the visible region. Both samples exhibit photo-and radioluminescence with a broad emission peaking at 380 nm. The decay curves are fitted by a single exponential decay function with decay time constants of 30-50 ns, consistent with the typical value of the emission for the 5d-4f transitions of Ce 3+ . From the pulse height spectra measured under 241 Am γ-ray (59.5 keV) irradiation, the scintillation light yields are 17000 ph/MeV for the single crystal and 6100 ph/ MeV for the synthesized ceramic. The scintillation light yield and afterglow of the present samples show a negative correlation.

“…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%.