Development of a high-resolution alpha-particle imaging system for detection of plutonium particles from the Fukushima Daiichi nuclear power plant

Yamamoto, Seiichi; Tomita, Hideki

doi:10.1016/j.radmeas.2018.05.009

Cited by 16 publications

(8 citation statements)

References 19 publications

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“…High resolution radiation imaging detectors are desired in many applications such as autoradiography [1,2], Pu particle detection [3][4][5][6], positron emission tomography or single photon emission tomography (SPECT) [7][8][9][10][11][12][13][14][15][16] and prompt radiation imaging in particle therapies [17][18][19]. We previously reported that ceramic Gd 3 (GaAl) 5 O 12 :Ce (GGAG) was an excellent material for the development of an event-by-event-based radiation imaging detector when it was combined with a position-sensitive photomultiplier (PSPMT) [20].…”

Section: Introductionmentioning

confidence: 99%

A high resolution radiation imaging detector using a ceramic YGAG scintillator plate

Yamamoto

Terazawa

2019

J. Inst.

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A: Ce doped (YGd) 3 (GaAl) 5 O 12 :Ce (YGAG) is a ceramic scintillator originally developed for X-ray computed tomography (CT). It has high light output and is also a promising candidate for high resolution event-by-event radiation imaging detectors. Thus we developed a radiation imaging detector using a YGAG plate combined with a position sensitive photomultiplier tube (PSPMT) and evaluated the performance. The spatial resolution for Am-241 alpha particles (5.5 MeV) was ∼ 0.4 mm FWHM and the energy resolution was 12 % FWHM. The spatial resolution for Sr-Y-90 beta particles, Am-241 gammas (60 keV) and Cs-137 X-ray (∼ 35 keV) was 0.8 mm FWHM, 1.6 mm FWHM and 2.0 mm FWHM, respectively. The decay time difference of YGAG between 5.5 MeV alpha particles and 662 keV Cs-137 gammas was 37 ns and the pulse shape spectra for 5.5 MeV alpha particles and 662 keV Cs-137 gammas were separated without overlap with the figure of merit (FOM) of 1.14. It was possible to separate the alpha particle and gamma photon images using pulse shape discrimination. Using pulse shape discrimination, it was also possible to separate the alpha particles and gamma photons in the electrostatically collected radon daughters on the imaging detector. We conclude that the developed YGAG imaging detector is useful for high resolution radiation detector with pulse shape discrimination capability to discriminate the different types of radiations. K: Detector design and construction technologies and materials; Dosimetry concepts and apparatus; Scintillators and scintillating fibres and light guides; Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators) 1Corresponding author.

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Section: Introductionmentioning

confidence: 99%

A high resolution radiation imaging detector using a ceramic YGAG scintillator plate

Yamamoto

Terazawa

2019

J. Inst.

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“…Recently, radiation imaging systems have been used in such fields as nondestructive testing, nuclear medical imaging, and geological surveying. (4)(5)(6) Scintillator screens with excellent luminescence and emission wavelengths compatible with photon detectors are required for radiation imaging. Tl + -doped CsI films and Tb 3+ -doped Gd 2 O 2 S (GOS) powder phosphors are used as scintillator screens because of their high luminescence yield and well-matched emission band (500-800 nm) with CCD detectors.…”

Section: Introductionmentioning

confidence: 99%

Photo- and Radioluminescence Properties of Eu3+-doped Y2O3 Thick Film Phosphor Prepared via Chemical Vapor Deposition

Matsumoto¹,

Watanabe²,

Ito³

2022

Sensors and Materials

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We demonstrate the high-speed epitaxial growth of a Eu 3+ -doped Y 2 O 3 (Eu 3+ :Y 2 O 3 ) thick film phosphor grown on a (100) yttria-stabilized zirconia substrate by laser-assisted metalorganic CVD. The deposition rate was 42 μm h −1 and the resultant 7-μm-thick Eu 3+ :Y 2 O 3 film was optically transparent. Under UV and X-ray irradiation, the Eu 3+ :Y 2 O 3 thick film emitted red light originating from the 5 D 0 → 7 F 2 transition of Eu 3+ ions with a fluorescence decay time of 1.7 ms.

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“…X-ray imaging finds hidden contamination and damage for manufacturing engineering, medical diagnostics, and airport security controls, whereas α-particle imaging detects hazardous α-emitters in decontamination activities of nuclear plants 1 – 3 . Although powder scintillator screens have been used for a long time for their excellent light yields, their energy resolution is low due to their low opacity 4 , 5 .…”

Section: Introductionmentioning

confidence: 99%

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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Development of a high-resolution alpha-particle imaging system for detection of plutonium particles from the Fukushima Daiichi nuclear power plant

Cited by 16 publications

References 19 publications

A high resolution radiation imaging detector using a ceramic YGAG scintillator plate

A high resolution radiation imaging detector using a ceramic YGAG scintillator plate

Photo- and Radioluminescence Properties of Eu3+-doped Y2O3 Thick Film Phosphor Prepared via Chemical Vapor Deposition

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

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