An alpha-particle imaging system for detecting plutonium contamination

Iida, Takao; Yamamoto, Seiichi; Ikebe, Yukimasa; Seki, Akio; Nakata, Kei; Ebana, Minoru; Kanamori, Masashi; Yoshida, Mamoru

doi:10.1016/0167-5087(83)90723-8

Cited by 21 publications

(13 citation statements)

References 5 publications

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“…Because the scintillation efficiency of ZnS(Ag) is about the same as that of NaI(Tl) [2], the light yield of ZnS(Ag) would be 38000 photons/MeV. The scintillation detectors that employed ZnS(Ag) have high stability [3]. However ZnS(Ag)-based scintillators are not the best detectors to be used, because they are quite opaque and their energy resolution is very bad.…”

Section: Introductionmentioning

confidence: 99%

Performance comparison of scintillators for alpha particle detectors

Morishita

Yamamoto

Izaki

et al. 2014

Nuclear Instruments and Methods in Physics Research Section A:

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Scintillation detectors for alpha particles are often used in nuclear fuel facilities. Alpha particle detectors have also become important in the research field of radionuclide therapy using alpha emitters. ZnS(Ag) is the most often used scintillator for alpha particle detectors because its light output is high. However, the energy resolution of ZnS(Ag)-based scintillation detectors is poor because they are not transparent. A new ceramic sample, namely the cerium doped Gd 2 Si 2 O 7 (GPS) scintillator, has been tested as alpha particle detector and its performances have been compared to that one of three different scintillating materials: ZnS(Ag), GAGG and a standard plastic scintillator. The different scintillating materials have been coupled to two different photodetectors, namely a photomultiplier tube (PMT) and a Silicon Photo-multiplier (Si-PM): the performances of each detection system have been compared. Promising results as far as the energy resolution performances (10% with PMT and 14% with Si-PM) have been obtained in the case of GPS and GAGG samples. Considering the quantum efficiencies of the photodetectors under test and their relation to the emission wavelength of the different scintillators, the best results were achieved coupling the GPS with the PMT and the GAGG with the Si-PM

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Section: Introductionmentioning

confidence: 99%

Performance comparison of scintillators for alpha particle detectors

Morishita

Yamamoto

Izaki

et al. 2014

Nuclear Instruments and Methods in Physics Research Section A:

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“…To study the integrated images obtained with the system qualitatively and quantitatively, the sample was also photographed by using the ZnS( Ag) autoradiographic camera (Koizumi et al 1979 ) and the charged-particle imaging system (Iida and Ikebe 1986;Iida et al 1987). Figure 2 shows the distribution of Pu02 particles on a filter paper.…”

Section: Rapid Detection Of Puoz Contaminationmentioning

confidence: 99%

“…The authors constructed a charged-particle imaging video monitor system (Iida 1988;Iida and Nakajima 1988) which was developed from the charged-particle imaging systems for a particles (Iida et al 1983;Iida et al 1985) and low-energy 6 particles (Iida and Ikebe 1986;Iida et al 1987). The imaging video monitor system replaces the previously employed Polaroid film with a silicon intensifier target (SIT) camera and displays and processes the integrated video image of the distribution of radioactive nuclides on the filter.…”

Section: Introduction Inmentioning

confidence: 99%

Rapid Detection and Size Determination of PuO2 Particles Using a Charged-particle Imaging Video Monitor System

Iida

Shimura²,

Koizumi³

1990

Health Physics

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A charged-particle imaging video monitor system was constructed and applied to video imaging of the position profile of PuO2 particles on filter paper. The imaging video monitor system consists of a detector head, a silicon intensifier target (SIT) camera, a video frame memory, and a personal computer. The system can display the distribution image of PuO2 particles becoming gradually clearer on a video monitor. The integrated image that is transferred to the computer is analyzed quantitatively for the radioactivity of each PuO2 particle deposited on the filter paper. The system can not only rapidly distinguish PuO2 particle contamination from Rn daughter products, but can also determine the size distribution of the PuO2 particles.

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“…However, most of these layered detectors did not have the imaging capability. In some applications, an imaging detector is needed to identify the plutonium particle distribution that emits alpha particles [13], the Sr-90 distribution that emits beta particles, and the radiocesium in food that emits beta particles and gamma photons. For this purpose, we expanded the layered concept to an imaging detector that can measure the distribution of alpha and beta particles as well as gamma photons to realize an alpha-beta-gamma imaging detector.…”

Section: Introductionmentioning

confidence: 99%

Development of a three-layer phoswich alpha–beta–gamma imaging detector

Yamamoto

Ishibashi

2015

Nuclear Instruments and Methods in Physics Research Section A:

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a b s t r a c tFor radiation monitoring at the sites of such nuclear power plant accidents as Fukushima Daiichi, radiation detectors are needed not only for gamma photons but also for alpha and beta particles because some nuclear fission products emit beta particles and gamma photons and some nuclear fuels contain plutonium that emits alpha particles. In some applications, imaging detectors are required to detect the distribution of plutonium particles that emit alpha particles and radiocesium in foods that emits beta particles and gamma photons. To solve these requirements, we developed an imaging detector that can measure the distribution of alpha and beta particles as well as gamma photons. The imaging detector consists of three-layer scintillators optically coupled to each other and to a position sensitive photomultiplier tube (PSPMT). The first layer, which is made of a thin plastic scintillator (decay time: $ 5 ns), detects alpha particles. The second layer, which is made of a thin Gd 2 SiO 5 (GSO) scintillator with 1.5 mol% Ce (decay time: 35 ns), detects beta particles. The third layer made of a thin GSO scintillator with 0.4 mol% Ce (decay time: 70 ns) detects gamma photons. Using pulse shape discrimination, the images of these layers can be separated. The position information is calculated by the Anger principle from 8 Â 8 anode signals from the PSPMT. The images for the alpha and beta particles and the gamma photons are individually formed by the pulse shape discriminations for each layer. We detected alpha particle images in the first layer and beta particle images in the second layer. Gamma photon images were detected in the second and third layers. The spatial resolution for the alpha and beta particles was $ 1.25 mm FWHM and less than 2 mm FWHM for the gamma photons. We conclude that our developed alpha-beta-gamma imaging detector is promising for imaging applications not only for the environmental monitoring of radionuclides but also for medical and molecular imaging.

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An alpha-particle imaging system for detecting plutonium contamination

Cited by 21 publications

References 5 publications

Performance comparison of scintillators for alpha particle detectors

Performance comparison of scintillators for alpha particle detectors

Rapid Detection and Size Determination of PuO2 Particles Using a Charged-particle Imaging Video Monitor System

Development of a three-layer phoswich alpha–beta–gamma imaging detector

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