Luminescence and Scintillation Properties of Eu-doped CaAl2O4 Bulk Crystals

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Photoluminescence and X-ray-induced scintillation properties of xCe:20BaO-15Gd 2 O 3-65SiO 2 (x = 0, 0.01, 0.05, 0.1, 0.5) glasses were investigated. The glass samples emitted light via energy transfer from Gd 3+ in the host to Ce 3+. The 6 P 7/2-8 S 7/2 relaxation of Gd 3+ was confirmed notably in the undoped glass sample, but the emission due to Gd 3+ disappeared upon the addition of Ce. Furthermore, the decay time constant of Gd 3+ decreased with increasing Ce concentration.

Section: Analysis Methodsmentioning

confidence: 99%

X-ray-Induced Scintillation via Energy Transfer of Gd3+ and Ce3+ in Silicate Glasses Composed of Heavy Elements

Shiratori¹,

Nakauchi²,

Kato³

et al. 2020

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“…(16)(17)(18) Previously, we introduced the optical floating zone (FZ) method as an effective and powerful technique for searching new oxide scintillators with high melting points. (19)(20)(21)(22)(23) Up to now, pyrochlore RE 2 Hf 2 O 7 (RE = La, Gd, Lu) single crystals have been prepared using an optical FZ furnace equipped with Xe lamps, and the scintillation properties of these single crystals were reported for the first time by Nakauchi et al (18) To improve scintillation characteristics by increasing oxygen vacancies, Zr and Ti ions with radii smaller than that of the Hf ion are introduced into RE 2 Hf 2 O 7 single crystals to distort the crystal lattice because Hf-based oxide materials typically show luminescence due to oxygen vacancies such as F and F + centers. (24,25) Such investigations have been performed for several scintillator candidates showing intrinsic luminescence, and activation has been achieved in intrinsic scintillators.…”

Section: Introductionmentioning

confidence: 99%

Scintillation Properties of Ti- and Zr-doped Gd2Hf2O7 Crystals

Nakauchi¹,

Kato²,

Kawaguchi³

et al. 2020

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Zr-doped and Ti-doped Gd 2 Hf 2 O 7 single crystals were synthesized by the optical floating zone (FZ) technique to evaluate their scintillation properties. The synthesized single crystals show scintillation signals with a broad peak at 510 nm, and scintillation decay curves consist of two exponential functions with decay time constants on the nanosecond order. Both the Ti and Zr doping processes seem to enhance the scintillation properties of Gd 2 Hf 2 O 7. Regarding their afterglow characteristics, all the Gd 2 Hf 2 O 7 crystals show similar afterglow levels after X-ray irradiation for 2 ms.

“…Moreover, scintillation detectors have been used in many scientific areas, such as X-ray scanners for a security system, (5) environmental radiation monitoring, (6) positron emission tomography in medical diagnosis, (7) natural resource exploration, (8) and a specific sensor for high-energy physics research. (9) The selection of materials for solid-state scintillators is very wide, from single crystals, (10) transparent ceramics, (11) organics, (12) and hybrid compounds (13) to glass. (14) Although we have a wide freedom to select materials, candidate materials must have a large volume (bulk form) and a high transparency.…”

Section: Introductionmentioning

confidence: 99%

Scintillation Characteristics of Pr-doped Gd2Si2O7 Single Crystal

Kantuptim¹,

Akatsuka²,

Nakauchi³

et al. 2020

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Pr-doped gadolinium pyrosilicate, which had a composition of Gd 2 Si 2 O 7 , was synthesized by the floating zone method with different Pr concentrations from 0.1 to 2.0 mol%. After confirming the crystal phase by X-ray diffraction analysis, photoluminescence (PL) and scintillation properties were investigated. PL emission spectra showed a broad emission peak at 340-360 nm due to Pr 3+ 5d-4f transition, and decay times were around 9-12 ns. In X-ray-induced scintillation spectra, we confirmed a similar spectral shape with PL, and scintillation decay times were around 18-29 ns. In the 137 Cs γ-ray-irradiated pulse height measurement, the 1.0% Pr-doped sample had shown the highest scintillation light yield of 2290 ph/MeV among the present samples. In the same setup, we also used different γ-ray sources to check the energy response linearity. Finally, energy resolution as a function of γ-ray energy was investigated.