Scintillation Properties of (Lu,Y)AlO3 Doped with Nd

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Scintillators emitting near-infrared (NIR) photons have unique characteristics and have been attracting attention recently. For example, scintillators emitting NIR photons are expected to be effective tools for radiation dose monitoring in high-dose environments. In this study, YAlO 3 samples doped with various rare-earth ions (Er 3+ , Ho 3+ , Pr 3+ , and Tm 3+ ) were synthesized by the floating zone method and their scintillation properties from the UV to NIR range were evaluated. Regarding their scintillation detection property, the Er 3+ -doped sample indicated an approximately linear proportional relationship from 1 mGy to 10 Gy.

Section: Introductionmentioning

confidence: 99%

Optical and Scintillation Properties of YAlO3 Doped with Rare-Earths Emitting Near-infrared Photons

Akatsuka¹,

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.

“…(1,2) A scintillator is used for radiation detection in various fields, such as astrophysics, (3) particle physics, (4) well logging, (5) security, (6) and medical imaging. (7) A common scintillator detector for these fields consists of the scintillator phosphor and photodetector, which has the capability to convert low-energy photons into electrons. In general, the basic requirements for the scintillator include chemical stability, radiation hardness, high light yield, fast decay, and high density.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence and Scintillation Properties of Organic–Inorganic Perovskite-type Compounds with Bromophenethylamine

Horimoto¹,

Kawano²,

Nakauchi³

et al. 2020

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BrC 6 H 4 C 2 H 4 NH 3) 2 PbBr 4 (n-BrPhe) (n = 2, 3, 4) single crystals were synthesized with the aim of enhancing the scintillation light yield of (C 6 H 5 C 2 H 4 NH 3) 2 PbBr 4 (Phe), and their photoluminescence (PL) and scintillation characteristics were evaluated. A sharp PL peak due to the exciton emissions from the inorganic layer was observed at 390-420 nm in the n-BrPhe samples. They had lifetimes of 4.7 ns (2-BrPhe), 2.1 ns (3-BrPhe), and 0.9 ns (4-BrPhe) owing to the exciton recombination in the inorganic layer under 340 nm excitation. Regarding scintillation, a sharp peak due to exciton emissions from the inorganic layer was detected at 410-440 nm under X-ray irradiation, and the decay time constants under X-ray irradiation were 2.3 ns (2-BrPhe), 2.0 ns (3-BrPhe), and 2.1 ns (4-BrPhe). Moreover, the scintillation light yields under gamma-ray irradiation from 241 Am (59.5 keV) were found to be 3100 (2-BrPhe), 2200 (3-BrPhe), and 5900 photons/MeV (4-BrPhe), which were lower than that of Phe (18000 photons/MeV).