Scintillation properties of Gd3Al2Ga3O12:Ce3+ single crystal scintillators

Sakthong, Ongsa; Chewpraditkul, Weerapong; Wanarak, Chalerm; Kamada, Kei; Yoshikawa, Akira; Průša, P.; Nikl, M.

doi:10.1016/j.nima.2014.03.011

Cited by 26 publications

(5 citation statements)

References 28 publications

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“…The measuring system consists of an inorganic GAGG scintillation crystal with a high density of ρ GAGG 6.69 g cm ¡3 [12] and a high effective atomic number of Z eff 53.9 [13], that maximizes the probability of interaction for gammaray photons in the crystal. With a high light output of about Y GAGG 48 000 MeV ¡1 [12], GAGG is an appropriate scintillation material for spectroscopy. Furthermore, the intrinsic background of GAGG is very low, which is important for the detection of contamination with a low activity.…”

Section: A Experimental Setup and Data Acquisitionmentioning

confidence: 99%

Characterization of a Fiber Optic Radiation Sensor Prototype for Nuclear Dismantling

Dohler

Alshut

Lukas

et al. 2022

IEEE Trans. Nucl. Sci.

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The use of an active measurement system to localize contamination in concrete structures of nuclear facilities offers advantages like an easy on-site analysis within short measurement time. A measuring system based on a scintillation crystal connected to a long optical fiber with a large diameter could satisfy the demands of a measuring system for gamma-ray spectroscopy in boreholes. This work describes the developement of a gammaray spectroscopy system using a fiber optic radiation sensor. A prototype was built with a GAGG scintillation crystal, that could reach an energy resolution of 33 % at the 662 keV gamma-ray emission energy of 137 Cs. A minimal time for the detection of a contamination of a 137 Cs source with an activity of 21 kBq and a layer of 6 cm concrete between sensor and radiation source was determined to under one minute with three different evaluation methods. They were based on the decision threshold and the Kolmogorov-Smirnov test corresponding to the energy distribution and the distribution of time differences between detector events. Additionally, it was possible to estimate the distance of a point like source from the sensor by establishing a further analysis parameter comparing different energy regions of a spectrum.

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Section: A Experimental Setup and Data Acquisitionmentioning

confidence: 99%

Characterization of a Fiber Optic Radiation Sensor Prototype for Nuclear Dismantling

Dohler

Alshut

Lukas

et al. 2022

IEEE Trans. Nucl. Sci.

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“…Although GAGG:Ce has recently been widely applied, only a small number of studies have been performed on this material, which have focused on limited topics for specific applications [36,37]. In particular, the energy dependence of the light yield and the temperature characteristic, which are important for determining the GAGG:Ce performance, have not been investigated sufficiently.…”

Section: Jinst 13 P02023mentioning

confidence: 99%

Evaluation of GAGG:Ce scintillators for future space applications

et al. 2018

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Cerium-doped Gd3(Ga, Al)5O12 (GAGG:Ce) is a promising novel scintillator for gamma-ray detectors. While GAGG:Ce has already been implemented in various commercial products, its detailed characteristics and response to high-energy particles and gamma rays remain unknown. In particular, knowledge is lacking on the radiation tolerance of this scintillator against the gamma-ray and proton irradiation expected in future space satellite mission applications. In this study, we first investigate the light-yield energy dependence, energy resolution, decay time, radiation tolerance, and afterglow of GAGG:Ce scintillators under various temperature conditions. We find excellent linearity of ±3% between light yields and deposited energy over a wide range of 30–1836 keV; however, a light-yield deficit of more than 10% is observed below 30 keV of deposited gamma ray energy. We confirm that the temperature dependence of the light yield, energy resolution, and scintillation decay time is within 5–20% between −20 and 20 ̂C. We also evaluate the GAGG:Ce activation characteristics under proton irradiation and the light-yield degradation by accumulated dose using a 60Co source. Moreover, we successfully identify various gamma-ray lines due to activation. Finally, we find a substantial afterglow for GAGG:Ce scintillators over a few hours; such an afterglow is only minimally observed in other scintillators such as CsI:Tl and Bi4Ge3O12 (BGO). However, the afterglow can be substantially reduced through additional co-doping with divalent metal ions, such as Mg ions. These results suggest that GAGG:Ce is a promising scintillator with potential application in space satellite missions in the near future.

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“…In small-size detectors, these secondary gamma radiations have more probability of escaping as compared to relatively larger or intermediate-sized detectors [1]. The increase in crystal size raises the photo fraction, owing to a higher contribution from Compton scattering as well [29]. The photo fraction is a direct measure of the probability that gamma radiation interacted with the material through any interactions, ultimately depositing all its energy within the detector.…”

Section: Methodology To Estimate Relative Error Due To Scatteringmentioning

confidence: 99%

Relative estimation of scattering noise and electronic noise of a radiation detector

Kumari

Goswami

2023

Meas. Sci. Technol.

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This study investigates two unavoidable noise factors: electronic noise and radiation scattering, associated with detectors and their electronics. This study proposes a novel methodology to estimate electronic and scattering noise separately. It utilizes mathematical tools, namely, Kanpur theorem-1, standard deviation, similarity dice coefficient parameters, and experimental Computerized Tomography technique. Four types of gamma detectors: CsI (Tl), LaBr3(Ce), NaI (Tl) and HPGe are used with their respective electronics. A detector having integrated circuit electronics is shown to impart significantly less (~ 33% less) electronic noise in data as compared to detectors with distributed electronics. Kanpur Theorem-1 signature is proposed as a scattering error estimate. An empirical expression is developed showing that scattering noise depends strongly on mass attenuation coefficients of detector crystal material and weakly on their active area. The difference between predicted and estimated relative scattering is 14.6%.The methodology presented in this study will assist the related industry in selecting the appropriate detector of optimal diameter, thickness, material composition, and hardware as per requirement.

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Scintillation properties of Gd3Al2Ga3O12:Ce3+ single crystal scintillators

Cited by 26 publications

References 28 publications

Characterization of a Fiber Optic Radiation Sensor Prototype for Nuclear Dismantling

Characterization of a Fiber Optic Radiation Sensor Prototype for Nuclear Dismantling

Evaluation of GAGG:Ce scintillators for future space applications

Relative estimation of scattering noise and electronic noise of a radiation detector

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