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Journal Articles

Fabrication of neutron optical devices using PBW technique

Sakai, Takuro; Iikura, Hiroshi; Yamada, Naoto*; Sato, Takahiro*; Ishii, Yasuyuki*; Uchida, Masaya*

QST-M-8; QST Takasaki Annual Report 2016, P. 140, 2018/03

Journal Articles

Development of micro-structured fluorescent plates for high-resolution imaging

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

JPS Conference Proceedings (Internet), 11, p.020005_1 - 020005_6, 2016/11

Journal Articles

Introduction to neutron radiography

Iikura, Hiroshi; Sakai, Takuro; Matsubayashi, Masahito

Hamon, 25(4), p.277 - 282, 2015/11

We introduce the basic principle of neutron radiography technique, and the brief review of its applications. Most of works in this article have been performed at TNRF, Tokai, Japan. Neutron radiography is a nondestructive testing method, so that this technique is used for not only academic studies but also industrial applications. Keywords: neutron radiography, imaging, TNRF

Journal Articles

Using LiF crystals for high-performance neutron imaging with micron-scale resolution

Faenov, A.*; Matsubayashi, Masahito; Pikuz, T.*; Fukuda, Yuji; Kando, Masaki; Yasuda, Ryo; Iikura, Hiroshi; Nojima, Takehiro; Sakai, Takuro; Shiozawa, Masahiro*; et al.

High Power Laser Science and Engineering, 3, p.e27_1 - e27_9, 2015/10

 Times Cited Count:7 Percentile:50.14(Optics)

Journal Articles

Fabrication of fine imaging devices using an external proton microbeam

Sakai, Takuro; Yasuda, Ryo; Iikura, Hiroshi; Nojima, Takehiro; Koka, Masashi; Sato, Takahiro; Ishii, Yasuyuki; Oshima, Akihiro*

Nuclear Instruments and Methods in Physics Research B, 332, p.238 - 241, 2014/08

 Times Cited Count:0 Percentile:100(Instruments & Instrumentation)

We have successfully fabricated novel microscopic imaging devices made from UV/EB curable resin using an external scanning proton microbeams. The devices are micro-structured fluorescent plates that consist of an array of micro-pillars that align periodically. The base material used in the pillars is UV/EB curable resin and each pillar contains phosphor grains. The pattern exposures were performed using a proton beam writing technique. The height of the pillars depends on the range of the proton beam. Optical microscopy and scanning electron microscopy have been used to characterize the samples. The results show that the fabricated fluorescent plates are expected to be high-spatial-resolution imaging devices.

Journal Articles

Micromachining of commodity plastics by proton beam writing and fabrication of spatial resolution test-chart for neutron radiography

Sakai, Takuro; Yasuda, Ryo; Iikura, Hiroshi; Nojima, Takehiro; Matsubayashi, Masahito; Kada, Wataru; Koka, Masashi; Sato, Takahiro; Okubo, Takeru; Ishii, Yasuyuki; et al.

Nuclear Instruments and Methods in Physics Research B, 306, p.299 - 301, 2013/07

 Times Cited Count:7 Percentile:41.73(Instruments & Instrumentation)

Journal Articles

A Line pair indicator made of Gd film for evaluating spatial resolution

Yasuda, Ryo; Matsubayashi, Masahito; Sakai, Takuro; Nojima, Takehiro; Iikura, Hiroshi; Katagiri, Masaki*; Takano, Katsuyoshi*; Pikuz, T.; Faenov, A.*

Physics Procedia, 43, p.196 - 204, 2013/00

 Times Cited Count:1 Percentile:41.32

Journal Articles

Investigation of the brightness enhancement using brightness enhancement films on a scintillator

Iikura, Hiroshi; Tsutsui, Noriaki*; Saito, Yasushi*; Nojima, Takehiro; Yasuda, Ryo; Sakai, Takuro; Matsubayashi, Masahito

Physics Procedia, 43, p.161 - 168, 2013/00

 Times Cited Count:2 Percentile:25.19

Journal Articles

Development of an imaging system for the observation of water behavior in a channel in PEFC

Nojima, Takehiro; Yasuda, Ryo; Takenaka, Nobuyuki*; Katagiri, Masaki*; Iikura, Hiroshi; Sakai, Takuro; Matsubayashi, Masahito

Physics Procedia, 43, p.282 - 287, 2013/00

 Times Cited Count:2 Percentile:25.19

We developed a new imaging system for observing the water distribution in Polymer Electrolyte Fuel Cell (PEFC) under operation. This imaging system realizes both low noise and high sensitivity imaging and it enables to obtain an image in relatively short exposure time. This imaging system consists of EM-CCD (Electron Multiplication-Charged Coupled Device) camera, a LiF/ZnS scintillator screen and slit system. The EM-CCD camera has wide dynamic range and high sensitivity. The brightness of the scintillator screen is about three times higher than that of conventional type. The slit system was used for reducing the white dot noise caused by primary and/or secondary prompt $$gamma$$ rays. A characteristic test of this imaging system using JARI (Japan Automobile Research Institute)-standard cell was carried out at TNRF. In the results of the test, qualitative and quantitative observation of water behavior in the channel of PEFC was archived by the new imaging system.

Journal Articles

Development of a high-performance optical system and fluorescent converters for high-resolution neutron imaging

Sakai, Takuro; Yasuda, Ryo; Iikura, Hiroshi; Nojima, Takehiro; Matsubayashi, Masahito

Physics Procedia, 43, p.223 - 230, 2013/00

 Times Cited Count:0 Percentile:100

JAEA Reports

Arrangement of fuel cell system for TNRF

Nojima, Takehiro; Yasuda, Ryo; Takenaka, Nobuyuki*; Hayashida, Hirotoshi; Iikura, Hiroshi; Sakai, Takuro; Matsubayashi, Masahito

JAEA-Technology 2011-037, 33 Pages, 2012/02


We have equipped fuel cell operation system for TNRF at JRR-3 in order to visualize on performance of PEFC. Our system, which is aimed to be used in nuclear facility, is composed by various equipments that give safety in experiments such as hydrogen diluting system and purge system, etc. We confirmed normal operation of our system with JARI-standard fuel cell, and succeeded in visualizing water distribution of fuel cell on performance by our system with neutron radiography.

Journal Articles

Development of a high-speed camera system for neutron imaging at a pulsed neutron source

Segawa, Mariko; Kai, Tetsuya; Sakai, Takuro; Oi, Motoki; Kureta, Masatoshi

Nuclear Instruments and Methods in Physics Research A, 697, p.77 - 83, 2012/01

 Times Cited Count:13 Percentile:20.76(Instruments & Instrumentation)

Journal Articles

First demonstration of neutron resonance absorption imaging using a high-speed video camera in J-PARC

Kai, Tetsuya; Segawa, Mariko; Oi, Motoki; Hashimoto, Eiko; Shinohara, Takenao; Harada, Masahide; Maekawa, Fujio; Oikawa, Kenichi; Sakai, Takuro; Matsubayashi, Masahito; et al.

Nuclear Instruments and Methods in Physics Research A, 651(1), p.126 - 130, 2011/09

 Times Cited Count:9 Percentile:35.08(Instruments & Instrumentation)

The neutron resonance absorption imaging technique with a high-speed video camera was successfully demonstrated at the beam line NOBORU, J-PARC. We obtained a set of energy dependent images having enhanced contrast of sample foils around the resonance absorption energies of cobalt (132 eV), cadmium (28 eV), tantalum (4.3 and 10 eV), gold (4.9 eV) and indium (1.5 eV). The capability of this technique is discussed taking into account an absolute peak value and width of a resonance cross section, pulse width of neutron and quantity of sample material. The minimum quantities to perform the neutron absorption imaging with this technique are shown for most of elements.

Journal Articles

LiF crystals as high spatial resolution neutron imaging detectors

Matsubayashi, Masahito; Faenov, A. Ya.*; Pikuz, T.*; Fukuda, Yuji; Kato, Yoshiaki*; Yasuda, Ryo; Iikura, Hiroshi; Nojima, Takehiro; Sakai, Takuro

Nuclear Instruments and Methods in Physics Research A, 651(1), p.90 - 94, 2011/09

 Times Cited Count:6 Percentile:49.18(Instruments & Instrumentation)

Neutron imaging by color center formation in LiF crystals was applied to standard samples such as a sensitivity indicator (SI) for neutron radiography. The SI was exposed to 5 mm pinhole collimated thermal neutron beam with a LiF crystal and a neutron imaging plate (NIP) for 120 min in JRR-3 thermal neutron radiography facility. The image in NIP was read out with a readout resolution of 50 $$mu$$m. The image of SI in LiF crystal was read out with pixel size of 1.38 $$mu$$m using a laser confocal microscope. All gaps were clearly observed in the images for both LiF crystal and NIP, but small holes were not recognized for NIP. The experiment showed that LiF crystals had excellent characteristics as neutron imaging detectors such as high sensitivity, high spatial resolution, wide dynamic range and so on. In the paper, detailed characteristics of LiF crystals are compared with those of other neutron imaging detectors: NIP, a combination of fluorescent converter and cooled CCD camera.

Journal Articles

Evaluation of water distribution in a small operating fuel cell using neutron color image intensifier

Yasuda, Ryo; Nitto, Koichi*; Konagai, Chikara*; Shiozawa, Masahiro*; Takenaka, Nobuyuki*; Asano, Hitoshi*; Murakawa, Hideki*; Sugimoto, Katsumi*; Nojima, Takehiro; Hayashida, Hirotoshi; et al.

Nuclear Instruments and Methods in Physics Research A, 651(1), p.268 - 272, 2011/09

 Times Cited Count:7 Percentile:44.16(Instruments & Instrumentation)

Neutron radiography is one of useful tools to visualize water behavior in fuel cells under operation. In order to observe the detailed information about the water distribution in MEA and GDL in fuel cells, a high spatial resolution and high sensitivity neutron imaging system are required. We developed an imaging system using the neutron color imaging intensifier and continuously observed water distribution in operating a fuel cell. By using the system, a small type fuel cell under operation was continuously observed at the TNRF in every 20 sec. In the results, the water area was appeared from GDL and MEA, and expanded to the channel of the cathode side. On the other hand, voltage was gradually reduced with the operation time, and steeply dropped. It is considered that voltage drop was caused by blockage of gas flow due to the piling up water in the channel of the cathode side.

Journal Articles

Evaluation of water distribution in a small-sized PEFC by neutron radiography

Yasuda, Ryo; Shiozawa, Masahiro*; Katagiri, Masaki*; Takenaka, Nobuyuki*; Sakai, Takuro; Hayashida, Hirotoshi; Matsubayashi, Masahito

Denki Kagaku Oyobi Kogyo Butsuri Kagaku, 79(8), p.614 - 619, 2011/08

 Times Cited Count:1 Percentile:96.95(Electrochemistry)

Journal Articles

Accumulation of Co in yeast cells under metabolically active condition; Implication for role of yeast in migration of radioactive Co

Kozai, Naofumi; Onuki, Toshihiko; Sakamoto, Fuminori; Suzuki, Yoshinori*; Tanaka, Kazuya*; Iefuji, Haruyuki*; Sakai, Takuro

Journal of Nuclear Science and Technology, 48(8), p.1206 - 1213, 2011/08

 Times Cited Count:8 Percentile:39.39(Nuclear Science & Technology)

The accumulation and chemical states change of Co have been studied to elucidate the role of yeast ${it Saccharomyces cerevisiae}$ in the migration of radioactive-cobalt in the environment. These results indicate that the yeast performs higher retardation of the migration of Co in the metabolically active condition than the resting one.

Journal Articles

Development of a small-aperture slit system for a high collimator ratio at the thermal neutron radiography facility in JRR-3

Yasuda, Ryo; Nojima, Takehiro; Iikura, Hiroshi; Sakai, Takuro; Matsubayashi, Masahito

Journal of Nuclear Science and Technology, 48(7), p.1094 - 1101, 2011/07

 Times Cited Count:3 Percentile:69.54(Nuclear Science & Technology)

A small aperture system was developed and installed to enhance collimator ratio $$L$$/$$D$$ of the thermal neutron radiography facility (TNRF) in JRR-3. The small aperture system increases the $$L$$/$$D$$ by making small aperture $$D$$. Image sharpness was getting better with decreasing the aperture size below 10 mm by 10 mm in TNRF. The beam area of the small aperture slits was relatively small in comparison with that of the conventional large collimator, although gradually increasing with increasing the aperture size. Even 5 mm by 5 mm in aperture size, the practical beam area for imaging examinations corresponds to around 25 mm by 20 mm, which is enough area to carry out the high spatial resolution imaging.

Journal Articles

Electronic properties of femtosecond laser induced modified spots on single crystal silicon carbide

Tomita, Takuro*; Iwami, Masahiro*; Yamamoto, Minoru*; Deki, Manato*; Matsuo, Shigeki*; Hashimoto, Shuichi*; Nakagawa, Yoshinori*; Kitada, Takahiro*; Isu, Toshiro*; Saito, Shingo*; et al.

Materials Science Forum, 645-648, p.239 - 242, 2010/04

no abstracts in English

Journal Articles

Intracellular changes of metal elements by fucoidan extracted from brown seaweed; ${it Cladosiphon okamuranus}$

Nagamine, Takeaki*; Takada, Hisashi*; Kusakabe, Takahiko*; Nakazato, Kyomi*; Sakai, Takuro; Oikawa, Masakazu*; Kamiya, Tomihiro; Arakawa, Kazuo; Iha, Masahiko*

Biological Trace Element Research, 124(1), p.60 - 69, 2008/07

 Times Cited Count:2 Percentile:92.53(Biochemistry & Molecular Biology)

This study was undertaken to elucidate the intracellular changes of metal elements after the administration of fucoidan extracted from ${it Cladosiphon okamuranus}$. TRL1215 cells (normal rat liver cell line) were treated with 0, 0.1, or 1.0 mg/mL fucoidan. The cellular distribution of elements was analyzed using in-air micro-PIXE induced X-ray emission. In fucoidan-treated cells, the focal accumulation of Br (BrdU) was correlated spatially with phosphorous-rich region, suggesting that Br was localized within the nucleus. Al distribution provided a spatial association with Br map. These data suggest that fucoidan binding Al us postulated to be transferred into the nucleus.

159 (Records 1-20 displayed on this page)