Study of the correlation of scintillation decay and emission wavelength

Yanagida, Takayuki; Fujimoto, Yutaka; Yamaji, Akihiro; Kawaguchi, Noriaki; Kamada, Kei; Totsuka, Daisuke; Fukuda, Kentaro; Yamanoi, Kohei; Nishi, Ryosuke; Kurosawa, Shunsuke; Shimizu, Toshihiko; Sarukura, Nobuhiko

doi:10.1016/j.radmeas.2012.05.014

Cited by 80 publications

(43 citation statements)

References 30 publications

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“…26) Following this study, we investigated the relation between the scintillation decay time and the emission wavelength experimentally; the decay time was proportional to ∼λ 2.2 . 27) Figure 7 represents the relationship between the decay time, τ, and the emission wavelength, λ, in PL and the scintillation. In this work, it was proved that the relationship in PL decay and the emission wavelength could also be applied to the scintillation phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Inorganic scintillating materials and scintillation detectors

Yanagida

2018

Proceedings of the Japan Academy. Ser. B: Physical and Biologic

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Scintillation materials and detectors that are used in many applications, such as medical imaging, security, oil-logging, high energy physics and non-destructive inspection, are reviewed. The fundamental physics understood today is explained, and common scintillators and scintillation detectors are introduced. The properties explained here are light yield, energy non-proportionality, emission wavelength, energy resolution, decay time, effective atomic number and timing resolution. For further understanding, the emission mechanisms of scintillator materials are also introduced. Furthermore, unresolved problems in scintillation phenomenon are considered, and my recent interpretations are discussed. These topics include positive hysteresis, the co-doping of non-luminescent ions, the introduction of an aimed impurity phase, the excitation density effect and the complementary relationship between scintillators and storage phosphors.

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Section: Introductionmentioning

confidence: 99%

Inorganic scintillating materials and scintillation detectors

Yanagida

2018

Proceedings of the Japan Academy. Ser. B: Physical and Biologic

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364

167

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“…A pulse X-ray tube (Hamamatsu N5084) and a photomultiplier tube (Hamamatsu R7400) employed as a photodetector were used for the measurement of RL decay curves. (22) The basic concept of the system was the same as that of a pulse X-ray streak camera system, (23) with only the photodetector being changed. OSL spectra were measured after X-ray exposure at 10 Gy using TL-2000 (Nano Gray).…”

Section: Experimental Methodsmentioning

confidence: 99%

Photo- and Radioluminescence of Sn2+ Centers in Alkaline Earth Oxide-Substituted Zinc Phosphate Glass

2016

Sensors and Materials

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The photoluminescence (PL) and radioluminescence (RL) of Sn 2+ centers in alkaline earth oxide (RO)-substituted ZnO-P 2 O 5 glasses, which were prepared under Ar, were examined. We confirm that the network structure of the host glass was changed by the substitution of RO for ZnO. Although it seems that the optical absorption is independent of the kind of substituted RO, the PL intensities and the PL decay constants suggest that the local coordination state of the Sn 2+ center is affected by the substitution. From the results of RO-substituted SnO-ZnO-P 2 O 5 (SZP) glasses, it is expected that an aggregation of Sn 2+ centers occurs preferentially in a more highly substituted system. The thermally stimulated luminescence of the RO-substituted glasses suggests that structural rearrangement during the quenching process induces both aggregation of Sn 2+ centers and decrease in the number density of traps in the SZP glasses.

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“…In order to compare decay time profiles in photoluminescence and neutron-induced ones, X-ray irradiated scintillation decay time profiles were evaluated by pulse with an X-ray streak camera system28 monitoring 435 ± 15 nm.…”

Section: Methodsmentioning

confidence: 99%

Local coordination state of rare earth in eutectic scintillators for neutron detector applications

Masai

Yanagida

Mizoguchi³

et al. 2015

Sci Rep

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Atomic distribution in phosphors for neutron detection has not been fully elucidated, although their ionization efficiency is strongly dependent on the state of the rare earth in the matrix. In this work, we examine optical properties of Eu-doped 80LiF-20CaF 2 eutectics for neutron detector applications based on the Eu distribution. At low concentrations, aggregation of Eu cations is observed, whereas homogeneous atomic dispersion in the CaF 2 layer, to substitute Ca 2+ ions, is observed in the eutectics at high concentrations. Eu L III edge X-ray absorption fine structure (XAFS) analysis suggests that neutron responses do not depend on the amount of Eu 2+ ions. However, transparency, which depends on an ordered lamellar structure, is found to be important for a high light yield in neutron detection. The results confirm the effectiveness of the basic idea concerning the separation of radiation absorbers and activators in particle radiation scintillation and present potential for further improvement of novel bulk detectors.Scintillators, which convert ionizing radiation to thousands of photons, have played a major role in a variety of fields that involve radiation detection including medical imaging, security, astrophysics, particle physics, and searching for natural resources [1][2][3][4][5][6][7] . Among the several types of scintillators, the thermal neutron scintillation detector is one of the most fascinating. The conventional thermal neutron detector is a gas proportional counter filled with 3 He gas because of high thermal neutron cross-section and the low background γ -ray sensitivity. However, 3 He gas, which is a product of the decay of 3 H in nuclear reactors, is no longer available owing to its high demand and declining supply. Therefore, the enhancement of production was impossible [8][9] . Meanwhile, there is a demand for sensitive thermal neutron detectors for both scientific and industrial purposes. To resolve this situation, the effort toward the fabrication of novel thermal neutron scintillators to replace the present 3 He-based systems has been heightened. To this end, we propose a candidate:6 Li-containing solid state materials. Because 6 Li has a high interaction probability with thermal neutrons based on the 6 Li(n, α ) 3 H reaction with a high Q-value of 4.8 MeV, there are several reports on Li-containing solid state matter exhibiting good scintillation properties of a 252 Cf neutron source [10][11][12][13][14][15] . Recently, lithium-containing fluorides have attracted attention regarding the high conversion efficiency attained by low phonon energy. Among these Li-containing fluorides, the activator-doped LiF/CaF 2 eutectic prepared by a simple solidification method 16 is reported as a candidate for neutron scintillator applications 17,18 . The concept of the scintillation mechanism of rare-earth-doped LiF/CaF 2 eutectic is based on the separation of the neutron absorber and the conversion of photons by

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Study of the correlation of scintillation decay and emission wavelength

Cited by 80 publications

References 30 publications

Inorganic scintillating materials and scintillation detectors

Inorganic scintillating materials and scintillation detectors

Photo- and Radioluminescence of Sn2+ Centers in Alkaline Earth Oxide-Substituted Zinc Phosphate Glass

Local coordination state of rare earth in eutectic scintillators for neutron detector applications

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