Optimization of thickness of GAGG scintillator for detecting an alpha particle emitter in a field of high beta and gamma background

Morishita, Yuki; Yamamoto, Seiichi; Izaki, Kenji; Kaneko, Junichi; Hoshi, Katsuya; Torii, Tatsuo

doi:10.1016/j.radmeas.2018.02.003

Cited by 22 publications

(10 citation statements)

References 14 publications

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“…Bulk scintillators millimeter-thick single crystals and transparent polycrystalline ceramics have disadvantage of light scattering and self-absorption, which degrades spatial resolution and light output for radiation imaging. Among the radiations, α-particle has a penetration depth in micrometer scale, and thus absorption and scattering of radioluminescence light in scintillator medium is remarkable for the bulk scintillators 10 . Thus, there is an optimal thickness that obtains a high light yield produced by each radiation.…”

Section: Resultsmentioning

confidence: 99%

“…Ce 3+ -doped Lu 3 Al 5 O 12 (Ce 3+ :LuAG) is a promising inorganic scintillation material with high effective atomic number (61), high light yield (25,000 photons MeV −1 ), and fast decay constants (50–70 ns) for high-resolution X-ray imaging 8 , 9 and sensitive detection of α-emitters 10 , 11 . Ce 3+ :LuAG thick film scintillator is often produced by slicing and polishing of Ce 3+ :LuAG single crystal or transparent polycrystalline ceramic.…”

Section: Introductionmentioning

confidence: 99%

“…In the bulk scintillators, light scattering and selfabsorption reduce spatial resolution and light output in radiation imaging, and additional radioluminescence caused by γ-ray background complicates fast and sensitive α-particle detection 6,7 . Therefore, thick film scintillators, which have a comparable thickness with penetration depths of α-particle and soft X-ray, are expected to combine high light yield and high sensitivity to these radiations.Ce 3+ -doped Lu 3 Al 5 O 12 (Ce 3+ :LuAG) is a promising inorganic scintillation material with high effective atomic number (61), high light yield (25,000 photons MeV −1 ), and fast decay constants (50-70 ns) for high-resolution X-ray imaging 8,9 and sensitive detection of α-emitters 10,11 . Ce 3+ :LuAG thick film scintillator is often produced by slicing and polishing of Ce 3+ :LuAG single crystal or transparent polycrystalline ceramic.…”

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confidence: 99%

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High-throughput production of LuAG-based highly luminescent thick film scintillators for radiation detection and imaging

Matsumoto

Ito

2022

Sci Rep

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Radiography is non-destructive imaging for engineering, medical diagnostics, airport security checks, and decontamination activities in nuclear plants. Inorganic scintillators are phosphor materials that convert radiation into visible photons with high luminescence and fast response, and scintillators with a few tens of micrometers thickness can improve sensitivity in radiation detection and imaging. To date, a production method for thick film scintillators is a time and cost consuming way of slicing and poshing bulk single crystals and transparent ceramics. Here, the chemically vapor deposited Ce3+-doped Lu3Al5O12 thick film scintillators (CVD-Ce3+:LuAG) with a thickness of 1–25 μm were produced at deposition time of 1–30 min. Numerical simulations indicated the penetration depth of α-particle in Ce3+:LuAG is 12.8 μm, and the 14-μm-thick CVD-Ce3+:LuAG showed highest light yield (31,000 photons 5.5 MeV−1), superior to the commercial Ce3+:LuAG single crystal scintillator (21,000 photons 5.5 MeV−1). In the X-ray radiograph taken with CVD-Ce3+:LuAG as a scintillation screen, 5-μm-width bar of metal microgrids can be identified. Vapor deposition technique can be a novel high-throughput production way of a thick film scintillator which is in a micrometer-thickness effective to converting radiations into photons for sensitive α-emitter detection and high-resolution X-ray imaging.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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High-throughput production of LuAG-based highly luminescent thick film scintillators for radiation detection and imaging

Matsumoto

Ito

2022

Sci Rep

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“…Figure 15 shows a schematic drawing of the alpha particle imaging detector developed in this study. A very thin (0.05-mm-thick) GAGG scintillator was used employed to limit beta sensitivity 42 . The length and the width of the scintillator size 26 mm × 26 mm.…”

Section: Methodsmentioning

confidence: 99%

Detection of alpha particle emitters originating from nuclear fuel inside reactor building of Fukushima Daiichi Nuclear Power Plant

Morishita

Torii

Usami

et al. 2019

Sci Rep

Self Cite

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We measured alpha emitters obtained from a reactor building in the Fukushima Daiichi Nuclear Power Plant (FDNPP) by using an alpha particle imaging detector. For developing the detector, we used a very thin (0.05-mm-thick) a cerium-doped Gd3(Ga,Al)5O12 (Ce:GAGG) scintillator and silicon photomultiplier (SiPM) arrays as the photodetector. The floor of the reactor building in FDNPP was wiped off by using smear papers, and the radioactivity of these papers was measured by the alpha particle imaging detector. In addition, we measured a Plutonium (Pu) sample (mainly 5.5 MeV alpha particles from 238Pu) obtained from a nuclear fuel facility by using of the same detector for comparison with the smear papers. The alpha spectrum was in the energy range of 5–6 MeV, which corresponds to the alpha particle energy of 238Pu (5.5 MeV). The correlation coefficient of the alpha spectra of the smear papers and the Pu sample had a strong positive linear relation. Moreover, the peak of 241Am was identified by gamma spectrum measurement. Based on these results, we report actual findings of alpha emitters in the FDNPP reactor buildings originating from nuclear fuels. The surface contamination level of alpha emitters exceeded 4 Bq/cm2.

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“…Gallium also binds malignant cells more readily than normal cells due to the excessive sstr2 receptors found on malignant cells (Poeppel et al, 2011). As 68 Ga is a beta emitter (Valko et al, 2007;Morishita et al, 2018), it is used as a diagnostic tool relative to body weight, activity, and biological markers. The isotope is safely eliminated through healthy patient kidneys (Breeman et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Effect of Gallium-68 isotope injection on hemoglobin derivatives concentrations after instant injection and its recovery in male rabbits (Oryctolagus cuniculus)

Raafat

Osman²,

Faizo³

et al. 2022

JANS

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Oxidizing effects of ionizing radiation are well established and almost understood. However, exposure to low doses of widely used isotopes may result in minor and hidden oxidative stress in some forms of hemoglobin. This formation alteration regarding the legends of hemoglobin's stereochemical function may play a role in hemoglobin dysfunction. There are limited studies related to the effect of gallium isotope injections. The study intends to find the effect of gallium-68 isotope injection on male rabbits. It was conducted on thirty-two male rabbits (Orycytolagus cuniculus) divided into Group I: control and Group II: animals exposed to gallium-68 isotope at a similar dose commonly used in diagnostic protocols for humans. Blood samples were collected twice: the first was after two hours of injection with isotopes and the second was after twelve hours of injection. A linear, four-mathematical-equations matrix based on the Lamber-Beer law was used to measure the concentration of different hemoglobin derivatives. Results revealed a significant elevation (P<0.05) of methemoglobin, the oxidized form of hemoglobin, two hours after injection (Total hemoglobin = 4.463 ± 0.83), but this effect was completely reversed after twelve hours. This concluded that even low doses of isotopes result in oxidation of hemoglobin that recovers shortly. Furthermore, the outcome of the study supports the healthcare centres to understand the effect of gallium-68 injections on animals.

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Optimization of thickness of GAGG scintillator for detecting an alpha particle emitter in a field of high beta and gamma background

Cited by 22 publications

References 14 publications

High-throughput production of LuAG-based highly luminescent thick film scintillators for radiation detection and imaging

High-throughput production of LuAG-based highly luminescent thick film scintillators for radiation detection and imaging

Detection of alpha particle emitters originating from nuclear fuel inside reactor building of Fukushima Daiichi Nuclear Power Plant

Effect of Gallium-68 isotope injection on hemoglobin derivatives concentrations after instant injection and its recovery in male rabbits (Oryctolagus cuniculus)

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