Two-dimensional Neutron Detector with GEM and its Applications

Uno, S.; Uchida, Tomohisa; Sekimoto, M.; Murakami, Takeshi; Miyama, K.; Shoji, M.; Nakano, E.; Koike, T.; Morita, Ken; Satoh, Hiroaki; Kamiyama, Takashi; Kiyanagi, Yoshiaki

doi:10.1016/j.phpro.2012.03.019

Cited by 69 publications

(39 citation statements)

References 6 publications

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“…The used neutron TOF-imaging detector was 10 B-type GEM (gas electron multiplier) detector developed by Prof. Uno of High Energy Accelerator Research Organization (KEK) [38]. The GEM detector has the pixel size of 800 µm and the detection area is 10.24 cm × 10.24 cm.…”

Section: Spectrum Fitting Analysis Resultsmentioning

confidence: 99%

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Deriving Quantitative Crystallographic Information from the Wavelength-Resolved Neutron Transmission Analysis Performed in Imaging Mode

Sato

2017

J. Imaging

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Current status of Bragg-edge/dip neutron transmission analysis/imaging methods is presented. The method can visualize real-space distributions of bulk crystallographic information in a crystalline material over a large area (~10 cm) with high spatial resolution (~100 µm). Furthermore, by using suitable spectrum analysis methods for wavelength-dependent neutron transmission data, quantitative visualization of the crystallographic information can be achieved. For example, crystallographic texture imaging, crystallite size imaging and crystalline phase imaging with texture/extinction corrections are carried out by the Rietveld-type (wide wavelength bandwidth) profile fitting analysis code, RITS (Rietveld Imaging of Transmission Spectra). By using the single Bragg-edge analysis mode of RITS, evaluations of crystal lattice plane spacing (d-spacing) relating to macro-strain and d-spacing distribution's FWHM (full width at half maximum) relating to micro-strain can be achieved. Macro-strain tomography is performed by a new conceptual CT (computed tomography) image reconstruction algorithm, the tensor CT method. Crystalline grains and their orientations are visualized by a fast determination method of grain orientation for Bragg-dip neutron transmission spectrum. In this paper, these imaging examples with the spectrum analysis methods and the reliabilities evaluated by optical/electron microscope and X-ray/neutron diffraction, are presented. In addition, the status at compact accelerator driven pulsed neutron sources is also presented.

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Section: Spectrum Fitting Analysis Resultsmentioning

confidence: 99%

“…The collimator ratio L/D was 600 (the beam angular divergence was 1.6 mrad). The used neutron TOF-imaging detector was GEM [38] which has the pixel size of 800 µm and the detection area of 10.24 cm × 10.24 cm. The measurement time for sample beam was 16 hours and the measurement time for open beam was 16 hours.…”

Section: Tomographic Imaging Resultsmentioning

confidence: 99%

Deriving Quantitative Crystallographic Information from the Wavelength-Resolved Neutron Transmission Analysis Performed in Imaging Mode

Sato

2017

J. Imaging

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“…4(b). The neutron detector was used a gas electron multiplier (GEM) detector [10]. The grid was placed at the front of the GEM detector.…”

Section: Neutron Gridmentioning

confidence: 99%

Measurement and simulation for a complementary imaging with the neutron and X-ray beams

et al. 2017

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Abstract. By using a composite source system, we measured radiographs of the thermal neutron and keV X-ray in the 45-MeV electron linear accelerator facility at Hokkaido University. The source system provides the alternative beam of neutron and X-ray by switching the production target onto the electron beam axis. In the measurement to demonstrate a complementary imaging, the detector based on a vacuum-tube type neutron color image intensifier was applied to the both beams for dual-purpose. On the other hand, for reducing background in a neutron transmission spectrum, test measurements using a gadolinium-type neutron grid were performed with a cold neutron source at Hokkaido University. In addition, the simulations of the neutron and X-ray transmissions for various substances were performed using the PHITS code. A data analysis procedure for estimating the substance of sample was investigated through the simulations.

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“…Recently, new position-sensitive neutron detectors (PSNDs) with solid layers containing 10 B have been created. They are hybrid detectors [1][2][3], which contain 10 B layer used as a converter of neutron into charged particles which are detected in a gas-discharge chamber. The advantage of such detectors to detectors with helium-3 is an ability to operate in a wide range of neutron energies.…”

Section: Introductionmentioning

confidence: 99%