研究者詳細 - 瓜谷　章

論文 - 瓜谷　章

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Measurement of Thermal and Epithermal Neutron Flux Distribution in the Torus Hall of LHD using Activation Method in the First Deuterium Experiment Campaign 査読有り

Tomoyo TANAKA, Makoto KOBAYASHI, Sachiko YOSHIHASHI, Akira URITANI, Kenichi WATANABE, Atsushi YAMAZAKI, Takeo NISHITANI, Kunihiro OGAWA and Mitsutaka ISOBE

Plasma and Fusion Research 14 巻頁： 3405162-1 - 3405162-4 2019年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

In the Large Helical Device (LHD) of the National Institute for Fusion Science, a deuterium plasma experiment was performed in March 2017. Neutrons with an energy of 2.45 MeV are generated by d (d, n) 3He reactions. The evaluation of this neutron flux in the torus hall, as well as within the LHD vessel, is very important for the decommissioning of the LHD in the future and the radiation shielding for workers and components around the LHD. In this study, we evaluate the spatial distribution of thermal and epithermal neutron flux on the floor level of the LHD torus hall by measuring the neutron activation of gold foils. The flux information obtained in the experiment can be used for the evaluation of radio-activation and the shielding design.

DOI： 10.1585/pfr.14.340516

Pulsed Neutron Imaging Based Crystallographic Structure Study of a Japanese Sword made by Sukemasa in the Muromachi Period 査読有り

Kenichi Oikawa, Yoshiaki Kiyanagi, Hirotaka Sato, Kazuma Ohmae, Anh Hoang Pham, Kenichi Watanabe, Yoshihiro Matsumoto, Takenao Shinohara, Tetsuya Kai, Stefanus Harjo, Masato Ohnuma, k, Sigekazu Morito, Takuya Ohba, Akira Uritani, Masakazu Ito

Neutron Radiography WCNR-11 頁： 207-213 2019年10月

Crystallographic Structure Study of a Japanese Sword Masamitsu made in the 1969 using Pulsed Neutron Imaging 査読有り

Kazuma Ohmae, Yoshiaki Kiyanagi, Hirotaka Sato, Kenichi Oikawa, Anh Hoang Pham, Kenichi Watanabe, Yoshihiro Matsumoto, Takenao Shinohara, Tetsuya Kai, Stefanus Harjo, Masato Ohnuma, Shigekazu Morito, Takuya Ohba, Akira Uritani, M. Ito

Neutron Radiography WCNR-11 頁： 227-232 2019年10月

Comparative Study of Ancient and Modern Japanese Swords using Neutron Tomography 査読有り

Yoshihiro Matsumoto, Kenichi Watanabe, Kazuma Ohmae, Akira Uritani, Yoshiaki Kiyanagi, Hirotaka Sato, Masato Ohnuma, Anh Hoang Pham, Shigekazu Morito, Takuya Ohba, Kenichi Oikawa, Takenao Shinohara, Tetsuya Kai, Stefanus Harjo, Masakazu Ito

Neutron Radiography WCNR-11 頁： 221-226 2019年10月

Crystallographic Microstructure Study of a Japanese Sword made by Noritsuna in the Muromachi Period by Pulsed Neutron Bragg-Edge Transmission Imaging 査読有り

Hirotaka Sato, Yoshiaki Kiyanagi, Kenichi Oikawa, Kazuma Ohmae, Anh Hoang Pham, Kenichi Watanabe, Yoshihiro Matsumoto, Takenao Shinohara, Tetsuya Kai, Stefanus Harjo, Masato Ohnuma, Shigekazu Morito, Takuya Ohba, Akira Uritani, Masakazu Itoh

Neutron Radiography WCNR-11 頁： 214-220 2019年10月

Thermal neutron flux evaluation by a single crystal CVD diamond detector in LHD deuterium experiment 査読有り

44 巻 2019年9月

Measurement of neutron spectrum using activation method in deuterium plasma experiment at LHD 査読有り

Tanaka, T; Yoshihashi, S; Kobayashi, M; Uritani, A; Watanabe, K; Yamazaki, A; Nishitani, T; Ogawa, K; Isobe, M

FUSION ENGINEERING AND DESIGN 146 巻頁： 496 - 499 2019年9月

Thermal neutron flux evaluation by a single crystal CVD diamond detector in LHD deuterium experiment

Kobayashi, M; Ogawa, K; Isobe, M; Nishitani, T; Kamio, S; Fujiwara, Y; Tsubouchi, T; Yoshihashi, S; Uritani, A; Sakama, M; Osakabe, M

JOURNAL OF INSTRUMENTATION 14 巻 ( 9 ) 2019年9月

Development of thermal neutron moderator for testing boron agents for Boron Neutron Capture Therapy (BNCT) 査読有り

Ichikawa, G; Tsuchida, K; Kiyanagi, Y; Ishikawa, A; Hirata, Y; Yoshihashi, S; Watanabe, K; Uritani, A; Hamano, T; Ogawara, R; Suda, M; Igawa, K

JOURNAL OF INSTRUMENTATION 14 巻頁： 0 2019年6月

記述言語：日本語掲載種別：研究論文（学術雑誌）

We developed a thermal neutron source for performance tests of boron agents for
Boron Neutron Capture Therapy (BNCT) at Neutron exposure Accelerator System for Biological
Effect Experiments (NASBEE) in National Institute of Radiological Sciences, Japan. The thermal
neutron flux at the experimental position was measured to be 2:18 108 ncm2s, the cadmium
ratio was 9:21, and gamma ray dose rate was 2:11 Gyh. The neutron dose rate was estimated to be
2:96 Gyh. These values indicate that the neutron source can be applicable for tests of boron agents
although application range is limited. An example of irradiation experiment is described.

DOI： 10.1088/1748-0221/14/06/T06010

Web of Science

Basic evaluation of the Eu:BaFBr and Ce:CaF₂ hybrid type optical fiber based dosimeter system for correction of quenching effect under carbon ion irradiation 査読有り

Yuho Hirata, Kenichi Watanabe, Atsushi Yamazaki, Sachiko Yoshihashi, Akira Uritani, Yusuke Koba, Naruhiro Matsufuji, Takayuki Yanagida and Kentaro Fukuda

Progress in Nuclear Science and Technology 6 巻頁： 238-242 2019年2月

記述言語：英語掲載種別：研究論文（学術雑誌）

We fabricated the hybrid type optical fiber based dosimeter system using Eu:BaFBr and Ce:CaF2 optically stimulated luminescence (OSL) materials in order to correct the quenching effect under high LET particle irradiation. The fabricated dosimeter probe can obtain signals from both OSL materials through one optical fiber. We investigated the probe response by irradiating it with mono-energetic carbon ions and broad-spectrum ones making the spread-out Bragg peak (SOBP). We demonstrated that the SOBP shape can be improved by correction of the quenching effect using the relationship between the luminescence efficiency and the signal intensity ratio of both OSL materials.

DOI： 10.15669/pnst.6.238

Development of wide one-dimensional X-ray line sensor in backscatter X-ray imaging system for infrastructure inspection 査読有り

Kazuya Ohashi, Kenichi Watanabe, Atsushi Yamazaki, Akira Uritani, Hiroyuki Toyokawa, Takeshi Fujiwara, Shinichi Mandai and Hidenori Isa

Progress in Nuclear Science and Technology 6 巻頁： 208-211 2019年2月

記述言語：英語掲載種別：研究論文（学術雑誌）

We fabricated a wide one-dimensional X-ray line sensor in backscatter X-ray imaging system. The length and width of the sensitive area of our line sensor is 200 mm and 50 mm, respectively. By using fan-beam X-rays and scanning in the perpendicular direction to the fan-beam plane, two-dimensional backscatter X-ray images can be obtained. In basic experiments, we confirmed that an iron rod placed at the depth of, at least, 9 cm in a concrete brock can be seen by combining our line sensor and C-band linac X-ray generator.

DOI： 10.15669/pnst.6.208

Response evaluation of Onion-like single Bonner sphere neutron spectrometer using TRUST Eu:LiCAF scintillator 査読有り

Kenichi Watanabe, Tomoaki Mizukoshi, Atsushi Yamazaki, Sachiko Yoshihashi, Akira Uritani, Tetsuo Iguchi, Tomohiro Ogata, Takashi Muramatsu, Tetsuro Matsumotc and Akihiko Masuda

Progress in Nuclear Science and Technology 6 巻頁： 122-125 2019年2月

記述言語：英語掲載種別：研究論文（学術雑誌）

We have developed the single sphere neutron spectrometer with five sensitive layers using the TRUST Eu:LiCAF scintillator and the WLSF readout. We evaluated the energy dependence of the detector response at thermal neutron and 24 keV, 144 keV, 565 keV, 5MeV and 14.8 MeV mono-energetic neutron irradiation fields. The experimentally determined neutron sensitivities are consistent with the Monte Carlo calculations. The detector responses for a bare and a heavy-water moderated 252Cf sources also show good agreement with the expected ones using the Monte Carlo calculations.

DOI： 10.15669/pnst.6.122

Measurement of Thermal and Epithermal Neutron Flux Distribution in the Torus Hall of LHD using Activation Method in the First Deuterium Experiment Campaign

Tanaka, T; Kobayashi, M; Yoshihashi, S; Uritani, A; Watanabe, K; Yamazaki, A; Nishitani, T; Ogawa, K; Isobe, M

PLASMA AND FUSION RESEARCH 14 巻 2019年

Development of a neutron source for imaging at the electron linac facility in Kyoto University Research Reactor Institute 査読有り

Yoshiyuki Takahashi, Yoshiaki Kiyanagi, Kenichi Watanabe, Akira Uritani, Tadafumi Sano, Junichi Hori, Ken Nakajima

Physica B: Condensed Matter 551 巻頁： 488-491 2018年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

The Kyoto University electron linac, KURRI-LINAC, has been used for executing a project to develop methodology for the integrity evaluation of nuclear fuels, named the N-DeMAIN (Development of Non-Destructive Methods Adapted for Integrity test of Next generation nuclear fuels) project in Japan. As a non-destructive method, the neutron resonance transmission analysis was adopted for the identification and the quantification of nuclide in the fuels. Furthermore, determination of temperature distribution in the fuels based on Doppler broadening was also planned as well as traditional transmission imaging.
A target-moderator-reflector system (TMRS) and a beam collimator system has been redesigned to obtain the highest intensity with the use of simulation calculation. The neutron beam line is placed at an angle of 135° with respect to the electron beam line. Optimal arrangement of the target and the moderator was investigated. After then, collimator design was performed, and a collimator system to shape the neutron and γ ray beams was designed. Test experiments were performed by using this system.
Here, we explain the results of design study of the TMRS and the collimator, and the test experiments.

DOI： doi.org/10.1016/j.physb.2018.06.009

Development of a neutron source for imaging at the electron linac facility in Kyoto University Research Reactor Institute

Takahashi, Y; Kiyanagi, Y; Watanabe, K; Uritani, A; Sano, T; Hori, J; Nakajima, K

PHYSICA B-CONDENSED MATTER 551 巻頁： 488 - 491 2018年12月

コンクリート内部を可視化する後方散乱X線イメージング装置の開発招待有り

豊川弘之、藤原健、平義隆、萬代新一、伊佐英範、渡辺賢一、山崎淳、遠山貴之、大橋和也、瓜谷章

検査技術 23 巻 ( 11 ) 頁： 13-18 2018年11月

Design of Beam Shaping Assembly for an Accelerator-driven BNCT System in Nagoya University 査読有り

Akira URITANI, Yosuke MENJO, Kenichi WATANABE, Atsushi YAMAZAKI, Yoshiaki KIYANAGI and Kazuki TSUCHIDA

JPS Conf. Proc. 22 巻頁： 011002-1 - 011002-7 2018年11月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

An accelerator-driven compact neutron source for boron neutron capture therapy (BNCT) has been developed in Nagoya University since 2013. A Dynamitron accelerator and a Li target are used to generate neutrons. The 7Li(p, n)7Be nuclear reaction produces neutrons. Since the generated neutrons have considerably high energy, up to one MeV, it is necessary to lower the neutron energy to an epithermal region that is suitable for BNCT. In this work, we have designed a beam shaping assembly (BSA) that lowers the neutron energy and makes beam-like neutrons. The BSA consists of a MgF2 moderator, a lead reflector, a radiation shield and a neutron collimator. The PHITS (Ver.2.66) code has been used to simulate the neutron transport in the BSA. This paper mainly describes two issues. One is the optimization of the shape of the BSA, mainly the moderator, and the other is the dependence of the simulation results on the nuclear data libraries, JENDL-4.0 and ENDF/B-VII.1.

DOI： 10.7566/JPSCP.22.011002

Construction of the 2nd Beamline of Nagoya University Accelerator-driven Neutron Source (NUANS) 査読有り

Yusuke Tsuchikawa, Keisuke Abo, Daiki Furuzawa, Katsuya Hirota, Go Ichikawa, Sohei Imajo, Ikuya Ito, Yoshihisa Iwashita, Masaaki Kitaguchi, Yoshiaki Kiyanagi, Yasuhiko Miwata, Kazuya Sato, Hirohiko M. Shimizu, Hayato Takeshita, Kazuki Tsuchida, Yukio Tsurita, Akira Uritani, Kenichi Watanabe, Yutaka Yamagata, Atsushi Yamazaki, and Sachiko Yoshihashi

JPS Conf. Proc. 22 巻頁： 011024-1 - 011024-4 2018年11月

Improved Design of the Exit of a Beam Shaping Assembly for an Accelerator-driven BNCT System in Nagoya University 査読有り

Kazuya Sato, Akira Uritani, Kenichi Watanabe, Sachiko Yoshihashi, Atsushi Yamazaki, Yoshiaki Kiyanagi, and Kazuki Tsuchida

JPS Conf. Proc. 22 巻頁： 011003-1 - 011002-7 2018年11月

Development of One-Dimensional Position-Sensitive Neutron Detector Using TRUST Eu:LiCAF Scintillator 査読有り

Hiroaki SHIMIZU, Koichi KINO, Setsuo SATO, Kenichi WATANABE, Akira URITANI, Sachiko YOSHIHASHI and Atsushi YAMAZAKI

JPS Conf. Proc. 22 巻頁： 011020-1 - 011002-8 2018年11月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

We developed a one-dimensional position-sensitive neutron detector using Transparent RUbber SheeT type Eu:LiCaAlF6 (TRUST Eu:LiCAF) scintillators and a newly proposed wavelength-shifting fiber (WLSF) readout. The proposed position-sensitive WLSF readout consists of a number of WLSFs optically divided to distinguish the scintillation position. We experimentally compared the position sensitivities of the optically divided WLSF type detector and a conventional one using light attenuation in the WLSFs. We concluded that the proposed detector had higher spatial resolution than that of the conventional one. Additionally, we fabricated a prototype version of the optically divided WLSF type detector. We determined the prototype detector had a relative spatial resolution of approximately 20 %.

DOI： 10.7566/JPSCP.22.011020

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