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Journal Articles

Development of three-dimensional prompt $$gamma$$-ray analysis system

Segawa, Mariko; Matsue, Hideaki; Kureta, Masatoshi

Nuclear Instruments and Methods in Physics Research A, 605(1-2), p.54 - 56, 2009/06

 Times Cited Count:2 Percentile:22.19(Instruments & Instrumentation)

We developed a three- dimensional neutron induced prompt $$gamma$$-ray analysis (3D-PGA) system taking $$gamma$$-ray spectrum by anti-Compton Ge-detector. This system is one of the promising ways which enables the nondestructive and isotopic observation for internal structure on samples, since neutron beam strongly penetrates material and picks up information on several elements and isotopes. Here, the 3D imaging algorithms that can be employed in this system include computed tomography method which can re-construct position of elements inside samples, measuring $$gamma$$-ray from neutron capture reaction by several elements on a sample in three different directions with use of a collimated neutron beam. The present system had a position resolution with the order of mm reducing background $$gamma$$-ray caused by several materials used as shields for scattered neutrons on a sample position. Finally, the outline of this system is presented with some performance tests.

Journal Articles

A Combined method of small-angle neutron scattering and neutron radiography to visualize water in an operating fuel cell over a wide length scale from nano to millimeter

Iwase, Hiroki; Koizumi, Satoshi; Iikura, Hiroshi; Matsubayashi, Masahito; Yamaguchi, Daisuke; Maekawa, Yasunari; Hashimoto, Takeji

Nuclear Instruments and Methods in Physics Research A, 605(1-2), p.95 - 98, 2009/06

 Times Cited Count:31 Percentile:90.25(Instruments & Instrumentation)

We constructed an in-situ and simultaneous observation method as a result of combination between ultra-small-angle neutron scattering and neutron imaging (radiography). With this novel technique, we are able to visualize water distribution or transportation, occurring from micro to macro length scales in a polymer electrolyte fuel cell (PEFC). At a sample position of SANS-J-II at JRR-3, we installed a neutron imaging camera in order to construct an in-situ and simultaneous observation method by USANS and neutron imaging with monochromatized cold neutrons. In addition, in order to selectively observe MEA in a running PEFC by using the in-situ and simultaneous observation method, we need to replace carbon separators which cause strong small-angle scattering as a noise. To reduce this strong background, we replaced the carbon separators with the aluminium ones. As a result, the background scattering was minimized (1/10) as compared to before.

Journal Articles

Visualization of water permeation into granite by neutron radiography

Cho, Akio*; Matsubayashi, Masahito; Hasegawa, Shoichi*

Nuclear Instruments and Methods in Physics Research A, 605(1-2), p.197 - 199, 2009/06

 Times Cited Count:1 Percentile:13.08(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Shape measurement of bubble in a liquid metal

Saito, Yasushi*; Shen, X.*; Mishima, Kaichiro*; Matsubayashi, Masahito

Nuclear Instruments and Methods in Physics Research A, 605(1-2), p.192 - 196, 2009/06

 Times Cited Count:9 Percentile:56.98(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Quantification of water penetration into concrete through cracks by neutron radiography

Kanematsu, Manabu*; Maruyama, Ippei*; Noguchi, Takafumi*; Iikura, Hiroshi; Tsuchiya, Naoko*

Nuclear Instruments and Methods in Physics Research A, 605(1-2), p.154 - 158, 2009/06

 Times Cited Count:55 Percentile:96.95(Instruments & Instrumentation)

Journal Articles

Evaluation of water transfer from saturated lightweight aggregate to cement paste matrix by neutron radiography

Maruyama, Ippei*; Kanematsu, Manabu*; Noguchi, Takafumi*; Iikura, Hiroshi; Teramoto, Atsushi*; Hayano, Hiroyuki*

Nuclear Instruments and Methods in Physics Research A, 605(1-2), p.159 - 162, 2009/06

 Times Cited Count:28 Percentile:88.32(Instruments & Instrumentation)

Journal Articles

Dehydration process of fish analyzed by neutron beam imaging

Tanoi, Keitaro*; Hamada, Yosuke*; Seyama, Shohei*; Saito, Takayuki*; Iikura, Hiroshi; Nakanishi, Tomoko*

Nuclear Instruments and Methods in Physics Research A, 605(1-2), p.179 - 184, 2009/06

 Times Cited Count:3 Percentile:29.44(Instruments & Instrumentation)

Journal Articles

Effect of water distributions on performances of JARI standard PEFC by using neutron radiography

Murakawa, Hideki*; Ueda, Tadanobu*; Yoshida, Takehisa*; Sugimoto, Katsumi*; Asano, Hitoshi*; Takenaka, Nobuyuki*; Mochiki, Koichi*; Iikura, Hiroshi; Yasuda, Ryo; Matsubayashi, Masahito

Nuclear Instruments and Methods in Physics Research A, 605(1-2), p.127 - 130, 2009/06

 Times Cited Count:22 Percentile:83.4(Instruments & Instrumentation)

Journal Articles

Development of an ultra-high-speed scanning neutron tomography system for high-quality and four-dimensional visualizations

Kureta, Masatoshi; Iikura, Hiroshi

Nuclear Instruments and Methods in Physics Research A, 605(1-2), p.81 - 84, 2009/02

 Times Cited Count:3 Percentile:29.44(Instruments & Instrumentation)

A new neutron tomography imaging system was developed in order to realize a high-quality three-dimensional (3D) and four-dimensional (4D) visualizations by fusing the high-frame-rate neutron radiography and computed tomography (CT) techniques. Fundamental idea is that the object is revolved with high rotating speed and the neutron radiography images are recorded with a high-speed video camera and an image intensifier, and then the consecutive images are processed by 3D CT technique. The 4D dynamic images of the sand flow in the sandglasses could be visualized clearly. This new technique has also an advantage to reduce radio activation of the object materials remarkably.

Oral presentation

Development of multi pinhole aperture for improving spatial resolution with wide imaging area

Hayashida, Hirotoshi; Segawa, Mariko; Yasuda, Ryo; Iikura, Hiroshi; Sakai, Takuro; Matsubayashi, Masahito

no journal, , 

Improvement of spatial resolution is common needs of users of in neutron radiography (NR) in various research fields such as materials, fuel cell, architecture, and so on. High collimator ratio (L/D) is one of the most significant factors for high spatial resolution imaging, because size of the geometric unsharpness formed on an image is inversely proportional to L/D. Small aperture collimator system is effective for increasing L/D of neutron radiography system. In case of using a small aperture system on thermal neutron radiography facility (TNRF) in JRR-3, the imaging area is 20 mm by 20 mm, being not enough area to view large size samples. We are developing multi pinhole collimator in order to spread imaging area with high L/D.

Oral presentation

Development of high spatial resolution devices for neutron radiography in TNRF

Yasuda, Ryo; Hayashida, Hirotoshi; Iikura, Hiroshi; Sakai, Takuro; Matsubayashi, Masahito

no journal, , 

Neutron radiography is expected as an effective diagnostic tool of water distribution in membrane electrode assembly below 0.1mm in thickness in fuel cells. Since specification of collimator ration (L/D) and camera- lens system equipped with TNRF was not enough to obtain an image with good spatial resolution, we developed a small aperture collimator system to improve L/D and a lens - camera system for viewing local area. Results of characteristic tests show that image was getting clear with increasing with L/D and the performance of the small aperture collimator system was demonstrated. In case of local area viewing system, an image with 4 by 4 micro-meter in pixel size could be obtained.

Oral presentation

Evaluation of spatial resolution on ZnS:Ag/10B$$_{2}$$O$$_{3}$$ type scintillation converter for neutron imaging

Yasuda, Ryo; Katagiri, Masaki; Iikura, Hiroshi; Sakai, Takuro; Hayashida, Hirotoshi; Sugimoto, Katsumi*; Takenaka, Nobuyuki*; Matsubayashi, Masahito

no journal, , 

Scintillation converter is one of important devices, which determine the spatial resolution in NRG using camera system. We prepared 10B$$_{2}$$O$$_{3}$$ type with different thickness and evaluated the characteristics including spatial resolution. Those scintillators were tested using cooled type CCD camera system at thermal neutron radiography facility (TNRF) in JRR-3. Spatial resolution of those scintillators was evaluated as "half value" by the edge spread function method using knife-edged Gd plate with 0.1mm in thickness. The results show that the spatial resolution of the10B$$_{2}$$O$$_{3}$$ type scintillators is improved with thinning the scintillation layer and is not so different from that of LiF type ones. On the other hand, luminescence intensity of the 10B$$_{2}$$O$$_{3}$$ type scintillators is decreased with thinning the scintillation layer due to the reduction of efficiency of neutron capture and lower than that of LiF type ones.

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