Scintillation response of Ce-doped or intrinsic scintillating crystals in the range up to 1MeV

Mareš, J.; Beitlerová, A.; Nikl, M.; Solovieva, N.; D’Ambrosio, C.; Blažek, K.; Malý, P.; Nejezchleb, Karel; Notaristefani, F. de

doi:10.1016/j.radmeas.2004.04.004

Cited by 173 publications

(87 citation statements)

References 16 publications

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“…Furthermore, activator concentration and uniformity can be considerably increased over melt-grown crystals. LuAG:Ce scintillators have been described [17], but the presence of intrinsic radioactivity arising from the beta and gamma emission from 176 Lu (2.59% natural abundance) is an undesirable interference of ~200 decays/s-cm 3 . One paper on single crystal Ce-doped Gadolinium Scandium Aluminum Garnet reported energy resolution of 12.5% at 662 keV [18].…”

Section: Introductionmentioning

confidence: 99%

Scintillators With Potential to Supersede Lanthanum Bromide

Cherepy

Payne

Asztalos

et al. 2009

IEEE Trans. Nucl. Sci.

241

118

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is the most promising. SrI 2 (Eu) emits into the Eu 2+ band, centered at 435 nm, with a decay time of 1.2 µs and a light yield of up to 115,000 photons/MeV. It offers energy resolution better than 3% FWHM at 662 keV, and exhibits excellent light yield proportionality. Transparent ceramics fabrication allows production of Gadolinium-and Terbium-based garnets which are not growable by melt techniques due to phase instabilities. While scintillation light yields of Cerium-doped ceramic garnets are high, light yield non-proportionality and slow decay components appear to limit their prospects for high energy resolution.We are developing an understanding of the mechanisms underlying energy dependent scintillation light yield non-proportionality and how it affects energy resolution. We have also identified aspects of optical design that can be optimized to enhance energy resolution.

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Section: Introductionmentioning

confidence: 99%

Scintillators With Potential to Supersede Lanthanum Bromide

Cherepy

Payne

Asztalos

et al. 2009

IEEE Trans. Nucl. Sci.

241

118

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“…In this case the proportionality of the Ce-0.5% standard sample is worse than the best Pr-0.05% doped crystal. The proportionality of other Cz grown YAP:Ce from Mo crucible is presented in [17] and its proportionality is found between 90 and 102% in the same range of energies.…”

Section: Resultsmentioning

confidence: 96%

“…At RT the photoelectron yield, energy resolution (calculated from FWHM of the photopeak) and proportionality of were measured by new set-up with a hybrid photomultiplier (HPMT), model PPO 475B, manufactured by DEP company, Roden, the Netherlands, and multichannel analyzer in the pulse-height-analysis mode [17], [18]. For smaller samples (mPD-grown) the measurements were carried out under the excitation of Cd (22.2 and 88 keV) and Am ( and 59.6 keV) because in this range the YAP host has much higher linear attenuation coefficient than in the range above 200 keV.…”

Section: Samples and Experimental Techniquesmentioning

confidence: 99%

Can Pr-Doped YAP Scintillator Perform Better?

Nikl

Mareš

Vedda

et al. 2010

IEEE Trans. Nucl. Sci.

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Abstract-A numerous set of Pr-doped YAP single crystals was prepared using Czochralski and micro-pulling down methods. Crystals codoped by bi-, tri-and tetravalent ions were prepared by the latter method as well. The scintillation performance of all the prepared materials was evaluated using radioluminescence, photoelectron yield and scintillation decay measurements at room temperature. The influence of shallow traps was studied by means of thermoluminescence in the 10-350 K temperature range. Though the intrinsic scintillation efficiency of Pr-doped YAP is higher than that of YAP:Ce, enhanced delayed radiative recombination processes are found to be responsible for lower-than-expected photoelectron yield of the former system. The possibilities of further optimization of Pr-doped YAP scintillator are discussed.

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“…(2)(3)(4)(5) For nuclear power plants, the FOS could be used to measure radiation in conditions of high temperature and high humidity during accidents.…”

Section: Introductionmentioning

confidence: 99%

Development and Comparison of Fiber-Optic Sensors in Different Shapes for Remote Measurement of Gamma Radiation

2016

Sensors and Materials

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For safety reasons, it is desirable to measure radiation as remotely as possible. For remote measurement of gamma radiation, the fiber-optic sensor (FOS) was developed in this study by combining a plastic optical fiber and an inorganic scintillator. To identify the best shape of the sensing probe of the FOS in terms of its detection efficiency, three different shapes of probe were fabricated using an inorganic scintillator: a cylinder and two bundles of different lengths (30 and 10 mm). To identify the best reflector for the sensing probe, the side of each probe was wrapped with one of three different reflectors: Teflon tape, TYVEK 1056D, and aluminum foil. In this study, a total of twelve different sensing probes were prepared: three different shapes of sensing probes with three different reflectors, and three different shapes of the sensing probes without reflectors. To measure gamma radiation, a cesium-137 source (1 μCi) in a disk shape, 26 mm in diameter, was attached to the end of the sensing probes. The measurements showed that bundle shape II (a bundle of 26 inorganic scintialltors, 1 mm in diameter and 10 mm in length) was the best shape for the sensing probe, and aluminum foil was the best reflector.

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Scintillation response of Ce-doped or intrinsic scintillating crystals in the range up to 1MeV

Cited by 173 publications

References 16 publications

Scintillators With Potential to Supersede Lanthanum Bromide

Scintillators With Potential to Supersede Lanthanum Bromide

Can Pr-Doped YAP Scintillator Perform Better?

Development and Comparison of Fiber-Optic Sensors in Different Shapes for Remote Measurement of Gamma Radiation

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