Faculty Profiles - URITANI Akira

Papers - URITANI Akira

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Neutron yield calculation of thin and thick d-D targets by using PHITS with frag data table

Nishitani, T; Yoshihashi, S; Ogawa, K; Miwa, M; Matsuyama, S; Uritani, A

JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY Vol. 59 ( 4 ) page： 534 - 541 2022.4

Strain distribution visualization of punched electrical steel sheets using neutron Bragg-edge transmission imaging

Sasada, S; Takahashi, Y; Takeuchi, K; Hiroi, K; Su, YH; Shinohara, T; Watanabe, K; Uritani, A

JAPANESE JOURNAL OF APPLIED PHYSICS Vol. 61 ( 4 ) 2022.4

Evaluation of the thermal neutron sensitivity, output linearity, and gamma-ray response of optical fiber-based neutron detectors using Li-glass scintillator

Ishikawa, A; Watanabe, K; Yamazaki, A; Yoshihashi, S; Imai, S; Masuda, A; Matsumoto, T; Tanaka, H; Sakurai, Y; Nogami, M; Hitomi, K; Uritani, A; Harano, H

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Vol. 1025 2022.2

High-spatial-resolution measurement of magnetization distribution using polarized neutron imaging

Sasada, S; Hiroi, K; Osanai, K; Shinohara, T; Watanabe, K; Uritani, A

JAPANESE JOURNAL OF APPLIED PHYSICS Vol. 60 ( 12 ) page： 126003-1 - 126003-6 2021.12

クルックス管実験に用いられる誘導コイルを利用した理科実験 Reviewed

森千鶴夫、瓜谷章、神谷均、佐合穣、臼井俊哉

日本放射線安全管理学会誌 Vol. 20 ( 2 ) page： 45 - 51 2021.12

Benchmark Calculation of d-Li Thick Target Neutron Yield by JENDL/DEU-2020 for IFMIF and Similar Facilities

Nishitani, T; Yoshihashi, S; Kumagai, K; Kondo, K; Uritani, A

PLASMA AND FUSION RESEARCH Vol. 16 2021.11

Feasibility Study of the One-Dimensional Radiation Distribution Sensing Method Using an Optical Fiber Sensor Based on Wavelength Spectrum Unfolding

Terasaka, Y; Watanabe, K; Uritani, A; Yamazaki, A; Sato, Y; Torii, T; Wakaida, I

JOURNAL OF NUCLEAR ENGINEERING AND RADIATION SCIENCE Vol. 7 ( 4 ) page： 042002-1 - 042002-7 2021.10

名古屋大学におけるBNCT用加速器中性子源の開発 Invited

土田一輝、瓜谷章、鬼柳善明、西谷建夫、吉橋幸子、渡辺賢一、山﨑淳、本田祥梧、辻義之、恒吉達也

Isotope News Vol. 777 page： 6 - 11 2021.10

Evaluation of a one-dimensional position-sensitive quartz optical fiber sensor based on the time-of-flight method for high radiation dose rate applications

Terasaka, Y; Watanabe, K; Uritani, A

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Vol. 996 2021.4

High heat removal technique for a lithium neutron generation target used for an accelerator-driven BNCT system

Yoshihashi, S; Tsuneyoshi, T; Tsuchida, K; Furuzawa, D; Honda, S; Watanabe, K; Yamazaki, A; Tsuji, Y; Hamaji, Y; Tokitani, M; Tamura, H; Sagara, A; Kiyanagi, Y; Uritani, A

JOURNAL OF INSTRUMENTATION Vol. 16 ( 4 ) page： P04016 2021.4

First experimental verification of the neutron field of Nagoya University Accelerator-driven neutron source for boron neutron capture therapy

Watanabe, K; Yoshihashi, S; Ishikawa, A; Honda, S; Yamazaki, A; Tsurita, Y; Uritani, A; Tsuchida, K; Kiyanagi, Y

APPLIED RADIATION AND ISOTOPES Vol. 168 2021.2

Thermal neutron measurement by single crystal CVD diamond detector applied with the pulse shape discrimination during deuterium plasma experiment in LHD Reviewed

Makoto Kobayashi, MaurizioAngelone, SachikoYoshihashi, KunihiroOgawa, MitsutakaIsobe, TakeoNishitani, SiriyapornSangaroon, ShujiKamio, YutakaFujiwara, TomomiTsubouchi, AkiraUritani, MinoruSakama, MasakiOsakabe, the LHD Experiment Group

Fusion Engineering and Design Vol. 161 page： 112063 2020.12

Language：Japanese Publishing type：Research paper (scientific journal)

The Pulse shape discrimination (PSD) technique for single crystal CVD diamond detector (SDD) was applied to
the real-time thermal neutron measurement during the 3rd campaign of Deuterium-Deuterium (D-D) plasma
experiment in the Large Helical Device (LHD). The PSD method is based upon the different shape of electrical
pulses produced in diamond by gamma-ray (triangular-shaped pulse) and energetic ions (rectangular-shaped
pulse), respectively. An improved PSD was developed which makes use of the full width at half maximum
(FWHM) and the full width at 2/3 of the peak height (FW2/3 PH). These two parameters reflect the difference in
the pulse shape produced by gamma-rays and energetic ions.
The performance of this improved PSD technique was first tested irradiating the SDD by gamma-rays from
60Co and alphas from 241Am radiation sources, respectively. Then, using a 6LiF thermal neutron converter, a
successful discrimination between gamma-rays and alpha particles and tritons generated by the 6Li(n,α)3H re-
action induced by neutrons from 252Cf spontaneous fission neutron source was achieved. Thanks to this PSD
processing technique, the thermal neutron detection efficiency increased about 1.7 times compared to previous
measurements performed without the PSD technique.
The real-time thermal neutron measurement by SDD with this enhanced PSD processing was also used during
D-D plasma discharges in the Large Helical Device (LHD). It was found that both the time integrated counts and
the time evolution count rate measured by the SDD reproduced well that of the fission chamber used as official
LHD neutron monitor. The capability of the SDD detector using the PSD technique of precise real-time thermal
neutron measurement in LHD was demonstrated.

DOI： 10.1016/j.fusengdes.2020.112063

Web of Science

Response evaluation of a compact and highly efficient neutron diffractometer for compact accelerator neutron sources Invited

Sho Imai, Kenichi Watanabe, Astushi Yamazaki, Sachiko Yoshihashi, Akira Uritani, Seiji Tasaki, Setsuo Satoh

Radiation Protection Vol. 40 ( 6 ) page： 540 - 544 2020.11

Observation of neutron emission anisotropy by neutron activation measurement in beam-injected LHD deuterium plasmas Reviewed

Sugiyama S., Nishitani T., Matsuura H., Isobe M., Ogawa K., Tanaka T., Yoshihashi S., Uritani A., Osakabe M.

NUCLEAR FUSION Vol. 60 ( 7 ) 2020.7

Development of Optical-fiber-based Neutron Detector Using Li-glass Scintillator for an Intense Neutron Field Reviewed

Akihisa Ishikawa, Atsushi Yamazaki, Kenichi Watanabe, Sachiko Yoshihashi, Akira Uritani, Yoshinori Sakurai, Hiroki Tanaka, Ryo Ogawara, Mitsuru Suda, and Tsuyoshi Hamano

Sensors and Materials Vol. 32 ( 4 ) page： 1489-1495 2020.4

Language：English Publishing type：Research paper (scientific journal)

The development of a neutron detector for real-time measurements in an intense neutron field is desired. We are developing a quartz optical-fiber-based neutron detector as a real-time neutron monitor. Thus far, Eu:LiCaAlF6 crystals and LiF/Eu:CaF2 eutectics were used as the scintillators of the quartz optical-fiber-based neutron detectors. These scintillators have high light yields, but relatively long decay time constants, which are limitation factors of the dynamic range of optical-fiber-based neutron detectors. In this paper, we applied a small Li-glass scintillator to a quartz optical-fiber-based neutron detector using an optical fiber with high numerical aperture (NA) and a UV-curable resin with high transmittance. The fabricated detector showed a clear peak corresponding to neutron events in the pulse height distribution. The radiation resistance was evaluated and no deterioration was observed up to 2×1012 n/cm2. The detector output linearity was confirmed up to 450 kcps, which was about ten times larger than that of the detector using the conventional Eu:LiCaAlF6 or LiF/Eu:CaF2 scintillator.

DOI： doi.org/10.18494/SAM.2020.2748

A comparison between simulation and experimental results for depth profile of Li-6 reaction rate in a water phantom of BNCT using a small Li-6-based scintillator neutron detector with an optical fiber Reviewed

Ishikawa Akihisa, Yamazaki Atsushi, Watanabe Kenichi, Yoshihashi Sachiko, Uritani Akira, Tsurita Yukio, Tsuchida Kazuki, Kiyanagi Yoshiaki

RADIATION MEASUREMENTS Vol. 133 2020.4

Design and Construction of an Imaging beamline at the Nagoya University Neutron Source Reviewed

Katsuya Hirota, Shogo Awano, Takuhiro Fujiie, Seiso Fukumura, Mayu Hishida, Go Ichikawa,, Sohei Imajo, Ikuya Itoh, Yoshihisa Iwashita, Masaaki Kitaguchi, Yoshiaki Kiyanagi, Yasutoshi Kuriyama, Koki Morikawa, Yu-dai Niinomi, Hirohiko M. Shimizu, Kazuki Tsuchida, Yusuke Tsuchikwa, Yukio Tsurita, Akira Uritani, Kenichi Watanabe, Yutaka Yamagata, Nana Yamamoto, Atsushi Yamazaki, Sachiko Yoshihashi and Tamaki Yoshioka

EPJ Web Conf. Vol. 231 page： 05002 2020.3

Language：English Publishing type：Research paper (scientific journal)

The Nagoya University Accelerator driven Neutron Source (NUANS) is constructed at the main campus of the Nagoya University. The electrostatic accelerator is used with the maximum proton energy and intensity of 2.8MeV, 15mA(42kW) respectively. Two neutron beamlines are designed at NUANS. The BL1 is dedicated to BNCT development. The BL2 is designed for research and development for neutron devices and neutron imaging. The neutrons used for the BL2 are generated by using the (p, n) reaction from a thin beryllium target. We constructed a compact target station for the BL2 and measured the neutron transmission image.

DOI： 10.1051/epjconf/202023105002

Basic study on a LiF-Eu:CaF₂ mixed powder neutron scintillator

Watanabe Kenichi, Mitsuboshi Natsumi, Ishikawa Akihisa, Yamazaki Atsushi, Yoshihashi Sachiko, Uritani Akira, Kawaguchi Noriaki, Yanagida Takayuki, Fukuda Kentaro

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Vol. 954 2020.2

Sensitivity and linearity of optical fiber-based neutron detectors using small Li-6-based scintillators

Ishikawa Akihisa, Yamazaki Atsushi, Watanabe Kenichi, Yoshihashi Sachiko, Uritani Akira, Fukuda Kentaro, Koike Akifumi, Ogawara Ryo, Suda Mitsuru, Hamano Tsuyoshi

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Vol. 954 page： 161661-1 - 161661-5 2020.2

箔検電器によるクルックス管からのX 線の線量率測定 Reviewed

森千鶴夫，緒方良至，秋吉優史，臼井俊哉，村上浩介，羽澄大介，中村嘉行，渡辺賢一，瓜谷章，神谷均，佐合穣，宮川俊晴，田中隆一，掛布智久，森山正樹

Vol. 69 page： 1-12 2020.1

Language：Japanese Publishing type：Research paper (scientific journal)

高等学校などで使用されているクルックス管は，一般的に漏洩Ｘ線を発生している。Ｘ線の線量率の測定に，これらの学校が保有している箔検電器を使う方法を提案した。箔検電器の箔の開き角は電極に与えられた電位に依存して変化する。この電位はＸ線によって空気中に作られたイオンを集めて減少し箔は閉じて行く。しかし，空気中のイオン密度は周辺の電位や風，および箔検電器に荷電する電荷の正負の影響も受ける。正電荷を荷電した場合に箔が閉じる時間と負電荷を荷電した場合のそれとの幾何平均値をとることによって，電離箱で測定した線量率との間に再現性のある関係を得ることができた。この関係を校正線と呼ぶが，他の同様の市販の箔検電器にも適用できる。

DOI： 0.3769/radioisotopes.69.1

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