A5103176625- Luminescence Properties of Advanced Materials
- Radiation Detection and Scintillator Technologies
- Glass properties and applications
- Nuclear materials and radiation effects
- Photochromic and Fluorescence Chemistry
- Advanced Radiotherapy Techniques
- Photopolymerization techniques and applications
- Radiation Effects and Dosimetry
- Perovskite Materials and Applications
- Terahertz technology and applications
- Photoreceptor and optogenetics research
- Photorefractive and Nonlinear Optics
- Radiation Therapy and Dosimetry
- Polyoxometalates: Synthesis and Applications
- Advanced Polymer Synthesis and Characterization
- Solid State Laser Technologies
- Pigment Synthesis and Properties
- Solid-state spectroscopy and crystallography
- biodegradable polymer synthesis and properties
- Radioactive element chemistry and processing
- Material Science and Thermodynamics
- Advanced Chemical Physics Studies
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Chemical Synthesis and Characterization
Tohoku University
1998-2025
Tokyo Institute of Technology
2019
Nagoya Institute of Technology
2019
Kyushu Institute of Technology
2019
Okayama University
2019
Kyoto Institute of Technology
2001-2002
Abstract We report on the structural, photoluminescence (PL), and scintillation properties of Ce-doped P 2 O 5 –Al 3 –Cs O–BaO glass scintillators having different Ce concentrations (1.96, 3.85, 7.41, 10.7, 13.8 mol%) for gamma- X-ray detection. The highest density (3.57 g/cm ) was achieved with concentration mol%. PL emission X-ray-induced radioluminescence spectra showed peaks corresponding to allowed transition from 3+ 5d excited state 4f ground states. light yields (approximately 2200...
A single crystal of YAl3(BO3)4 was grown using the top-seeded solution growth method. The vacuum ultraviolet (VUV) excitation spectrum, monitored at emission wavelength 312 and 372 nm, showed a narrow band around 162 which is located near absorption edge host. Upon VUV characteristic self-trapped exciton (STE) bands were observed nm. X-ray excited scintillation spectrum shows broad peaking 310 nm with weak shoulder 375 consistent photoluminescence, can thus be assigned to STE emission. light...
Abstract Radiophotoluminescence (RPL) is an emission phenomenon induced by the photoexcitation of luminescent centers (RPL centers) formed ionizing radiation. Ag-doped phosphate glasses exhibiting RPL are applied in glass badge dosimeters used for personal monitoring. In this paper, we discuss behavior and their properties along with center formation disappearance mechanisms. When exposed to radiation, Ag 0 , 2+ m n+ such as 2 + clusters because acts electron hole trap. transfer holes from...
We fabricated neutron detection glasses, Tb3+-doped CaO–Al2O3–B2O3 including 10B-enriched (10B glass) and 11B-enriched (11B glasses. The glasses were irradiated with X-rays, heavy particles, or neutrons their thermoluminescence (TL) properties investigated. TL after X-ray particle irradiation the same for 10B 11B Meanwhile, irradiation, of significantly different. intensity was higher than that peak (n, α) reaction had good linearity in range 109–1013 neutrons/cm2.
Abstract We fabricated Tb 3+ -doped Li 2 O–Al O 3 –B glasses using 6 or n and 10 B 11 ( Li– glass, glass) to develop a new thermoluminescent (TL) material for neutron detection investigated the TL properties of these after X-ray, He ion, irradiation. glow peaks were observed at 350 550 K X-ray irradiation, 390 ion 400 600 The intensities around glass irradiation higher than that suggesting particles generated in Li( , t ) 4 B( α 7 reactions efficiently induce TL. neutron-induced range 1 × –5...
The mechanism behind radiophotoluminescence (RPL) emission in Ag-doped alkali-phosphate glass remains unclear. To contribute to resolving this issue, the authors measured and analyzed temporal change of electron spin/paramagnetic resonance (ESR) spectrum a recently developed, weather-resistant RPL glass, named "SAPANS," after irradiation with X-rays. As result, continuous gradual increase Ag2+-derived signals was observed even at four weeks post-irradiation, which corresponded well time...
We fabricated 10B-enriched (10B ceramics) and 11B-enriched (11B Ca2B2O5:Tb ceramics as thermoluminescence (TL) materials for neutron detection applications. The TL properties of the after X-ray irradiation, particle beam irradiation were investigated. 10B 11B similar, whereas neutron-induced intensity was significantly higher than that ceramics. different these are due to α-rays, Li ions, γ-rays generated during 10B(n, α)7Li reaction. lower limit by less 2 × 107 neutrons cm−2, which those...
X-ray absorption near-edge structure (XANES) spectroscopy is one of the most effective techniques for determining valence states cations. Since K- and L-edge transition processes are different, validity irradiation to evaluate these excitation must be determined. In this study, we focus on silver cations in aluminophosphate glasses, whose compositions have been used as radiophotoluminescence (RPL) glass detectors personal monitoring. Slight difference was observed between Ag K-edge XANES...
Abstract To develop thermoluminescent materials for neutron detection, 10 B-enriched and 11 Ca 2 B O 5 :Dy were prepared their thermoluminescence (TL) properties investigated after irradiation with X-rays, He ions thermal neutrons. The TL of these was induced by X-rays sensitivities to radiation are independent the boron isotopes in host materials. On contrary, intensity sample significantly higher than that high sensitivity neutrons is attributed γ -rays charged particles generated from...
Positron annihilation spectroscopy (PAS) is used for the quantification of cavities in a matrix.Although PAS sometimes considered nondestructive measurement method, it worth investigating interaction positrons with matrix during PAS.Here, we have demonstrated that defects are generated silver-doped phosphate glasses positron and radiophotoluminescence (RPL) observed after irradiation.There linear correlation between irradiation duration RPL intensity glasses.We high dose even conventional...
Ag-doped phosphate glasses have widely been used as radiophotoluminescence (RPL) dosimeters. However, the RPL center formation process is not fully understood. In this study, we investigated in Na–Al glasses. We observed that two centers (Ag0 and Ag2+) were formed at temperatures higher than 100 250 K, respectively. addition, activation energies of their estimated to be 20 267 meV, These results suggest electron transfer a simple thermally activated process.
Radiophotoluminescence (RPL) is an emission phenomenon resulting from the light excitation of RPL centers formed by hole and electron transfer upon irradiation with γ- or X-rays. The intensity proportional to absorption dose, therefore, applied in dosimetry. Many materials showing have been investigated. Amongst them, Ag-doped alkali halides are earliest known compounds RPL, but mechanism underlying center formation has not well understood. In this study, we investigated combining...
Abstract Ag-doped phosphate glasses are used in radiophotoluminescence (RPL) dosimeters. Ag 0 , 2+ and 2 + act as luminescence centers of RPL the glass, whereas they disappear when annealed. To understand reason for disappearance phenomenon, thermoluminescence (TL) glow curves, temperature dependence electron spin resonance spectra were measured self-made Na Al glass (Na–Al) Na–Al made by Chiyoda Technol (FD-7). It is shown conclusively that FD-7, electrons trapped at recombine with a part...