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

https://doi.org/10.7566/JPSCP.11.020005

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

Tracer diffusion coefficients of lithium ion in LiMnO measured by neutron radiography

Takai, Shigeomi*; Yoshioka, Kazuya*; Iikura, Hiroshi; Matsubayashi, Masahito; Yao, Takeshi*; Esaka, Takao*

Solid State Ionics, 256, p.93 - 96, 2014/03

https://doi.org/10.1016/j.ssi.2014.01.013

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

https://doi.org/10.1016/j.phpro.2013.03.023

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

https://doi.org/10.1016/j.phpro.2013.03.033

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 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.

Influence of powder particle size and scintillator layer thickness on the performance of GdOS:Tb scintillators for neutron imaging

Yasuda, Ryo; Katagiri, Masaki*; Matsubayashi, Masahito

Nuclear Instruments and Methods in Physics Research A, 680, p.139 - 144, 2012/07

https://doi.org/10.1016/j.nima.2012.03.035

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

https://doi.org/10.1016/j.nima.2011.02.039

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.

Evaluations of the new LiF-scintillator and optional brightness enhancement films for neutron imaging

Iikura, Hiroshi; Tsutsui, Noriaki*; Nakamura, Tatsuya; Katagiri, Masaki*; Kureta, Masatoshi; Kubo, Jun*; Matsubayashi, Masahito

Nuclear Instruments and Methods in Physics Research A, 651(1), p.100 - 104, 2011/09

https://doi.org/10.1016/j.nima.2011.01.010

Japan Atomic Energy Agency has developed the neutron scintillator jointly with Chichibu Fuji Co., Ltd. In this study, we evaluated the new ZnS(Ag):Al/LiF scintillator developed for neutron imaging. It was confirmed that the brightness increased by about double while maintaining equal performance for the spatial resolution as compared with a conventional scintillator. High frame-rate imaging using a high-speed video camera system and this new scintillator made it possible to image beyond 10000 frames per second while still having enough brightness. This technique allowed us to obtain a high-frame-rate visualization of oil flow in a running car engine. Furthermore, we devised a technique to increase the light intensity of reception for a camera by adding brightness enhancement films on the output surface of the scintillator. It was confirmed that the spatial resolution degraded more than double, but the brightness increased by about three times.

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

https://doi.org/10.5796/electrochemistry.79.614

Demonstration of magnetic field imaging in a permalloy film with neutron spin phase contrast imaging

Hayashida, Hirotoshi; Yamazaki, Dai; Ebisawa, Toru*; Maruyama, Ryuji; Soyama, Kazuhiko; Tasaki, Seiji*; Hino, Masahiro*; Matsubayashi, Masahito

Nuclear Instruments and Methods in Physics Research A, 634(1, Suppl.), p.S90 - S93, 2011/04

https://doi.org/10.1016/j.nima.2010.06.363

In a neutron spin interferometer (NSI), incident neutrons are in states of up- and down-spin eigenstates and a phase difference between the eigenstates is observed after transmission through a magnetic sample. Since the phase difference is proportional to an integral of magnetic field along a trajectory of neutrons, NSI imaging provides projection images of a distribution of magnetic field in the sample. We tried to visualize magnetic field in permalloy film with and without stress as a demonstration of the NSI imaging. An experiment was carried out at C3-1-2-2, MINE2 port at the neutron guide hall of JRR-3M with wavelength of 0.88nm and wavelength resolution of 0.3% in FWHM. Permalloy film with thickness of 0.1 mm was used as a sample and was stressed by bending with angles of 45 and 180 . As a result, images of decrease of a saturated magnetization and an increase of leak magnetic field with increasing the bending angle were obtained.