Faculty Profiles - URITANI Akira

Presentations -

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光ファイバー型小型線量計の放射線治療時の線量測定に向けた検討

平田悠歩, 渡辺賢一, 山﨑淳, 吉橋幸子, 瓜谷章, 古場裕介, 松藤成弘, 加藤匠, 河口範明, 柳田健之

第79回応用物理学会秋季学術講演会

Measurement of Neutron Spectrum using Activation Method in Deuterium Plasma Experiment at LHD International conference

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

30th Symposium on Fusion Technology

加速器BNCT用熱外中性子スペクトロメータの応答関数に関する検討

須田直樹、瓜谷章、渡辺賢一、吉橋幸子、山崎淳

日本原子力学会2018年秋の大会

Event date： 2018.9

Language：Japanese Presentation type：Oral presentation (general)

Venue：岡山大学津島キャンパス Country：Japan

加速器BNCTで患者に照射される熱外中性子（100~104 eV）のスペクトル測定に用いる検出器として、熱中性子シンチレータのEu:LiCAFを用い、中性子の減速材として従来のボナー球ではポリエチレンであったが本研究ではホウ素入りポリエチレンを用いた。ホウ素入りポリエチレンを減速材に用いることで熱外領域の中性子に高い感度を有する応答が得られた。

大電流陽子加速器におけるビームプロファイルモニタの設計・製作

阿保圭祐、土田一輝、吉橋幸子、瓜谷章、渡辺賢一

日本原子力学会2018年秋の大会

Event date： 2018.9

Language：Japanese Presentation type：Oral presentation (general)

Venue：岡山大学津島キャンパス Country：Japan

現在名古屋大学では、BNCTのためのDynamitron加速器が設置され調整中である。Liターゲットへ適切にビームを照射するため、加速器からの陽子ビームのプロファイルを取得することが重要である。Dynamitron加速器の最大電流は15 mAの大電流であり、その環境下で動作可能なBPMの検討を行った。

Crystallographic structure study of a Japanese sword Noritsuna in Muromachi period using pulsed neutron imaging International conference

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

11th World Conference on Neutron Radiography

Event date： 2018.9

Language：English Presentation type：Oral presentation (general)

Venue：Sydney Country：Japan

Japanese swords are very attractive not only as a work of art but also a metallurgical point of view. There were five traditional styles (Gokaden) of Japanese sword-making in the Koto (old sword) age; A.D. 987-1596. Since Japanese vintage swords became valuable, it is indispensable to establish non-destructive analysis method to identify some peculiar characteristics, related to the forging methods. Neutron experiments are powerful tool to study metallic cultural heritages due to their high penetrating power and capability to give crystallographic information . Bragg-edge neutron transmission imaging gives real-space distributions of bulk information in a crystalline material. In addition, by analyzing position-dependent Bragg-edge transmission spectra measured at a pulsed neutron source, quantitative visualization of the crystallographic information of a sword can be achieved.
In this work, we investigated crystallographic information of a Japanese sword made by Noritsuna in Bizen (one of Gokaden) in the fourth quarter of the 14th century. The experiments have been performed at the Energy-Resolved Neutron Imaging System, RADEN at J-PARC . The Noritsuna sword was measured at three regions with a counting-type 2D detector, nGEM. The measured position-dependent Bragg-edge transmission spectra were analyzed by the RITS code to obtain spatial distributions of the crystallite size, the texture variation, the d-spacing shift and its broadening. As a result, it was found that martensite phase exists near the blade, small crystallites were distributed at the tip region, and large crystallites were distributed at the stalk region. The crystallographic characteristics of Noritsuna, which are different from those of other swords, will be presented in detail.

Crystallographic structure study of a modern Japanese sword Masamitsu using pulsed neutron imaging International conference

Kazuma Oomae, 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 and Masakazu Ito

11th World Conference on Neutron Radiography

Crystallographic structure study of a Japanese sword Sukemasa in Muromachi period using pulsed neutron imaging International conference

K. Oikawa, Y. Kiyanagi, H. Sato, K. Oomae, P.H. Ann, K. Watanabe, Y. Matsumoto, T. Shinohara, T. Kai, S. Harjo, M. Ohnuma, S. Morito, T. Ohba, A. Uritani, M. Ito J-PARC Center, Japan Atomic Energy Agency, Ibaraki, 9-9, Japan

11th World Conference on Neutron Radiography

Comparative study of ancient and modern Japanese swords using neutron tomography International conference

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 and Masakazu Ito

11th World Conference on Neutron Radiography

Event date： 2018.9

Language：English Presentation type：Oral presentation (general)

Venue：Sydney Country：Japan

Japanese swords have superior characteristics in strength and toughness, giving them important value not only as a historical work of art but also from a metallurgical point of view. It is known that Japanese swords differ in the forging technique depending on the era and place of manufacture. Modern Japanese swords are produced based on the forging techniques developed after the Edo period (17th - 19th century). On the other hand, with regard to ancient Japanese swords `Koto' forged from the Kamakura period to the Muromachi period (12th - 16th century), there are still many unknown points in the materials and forging techniques used due to lack of historical records. Therefore, evaluating the internal crystallographic structure of ancient Japanese swords and comparing them with modern Japanese swords are important footholds for reviving the lost forging techniques in the present age. From the above viewpoints, we have investigated the three-dimensional internal structure and crystallographic structure of ancient and modern Japanese swords non-destructively using neutron tomography and energy-resolved neutron imaging (Bragg-edge imaging). In this study, we report on the results of the neutron tomography measurement. All experiments were carried out at the pulsed neutron imaging instrument RADEN located at BL22 of J-PARC MLF [1].
In the resulting neutron tomograms, it was observed that the neutron transmittance was different between steels near the surface and steels inside the blade in each of two ancient Japanese swords forged in the Muromachi period (named Morikage and Sukemasa) and a third modern Japanese sword (named Masamitsu) forged in the mid-20th century. This indicates that the martensitic phase was generated near the surface by quenching during forging. Furthermore, in the tomograms of the blade edge, it was observed that the neutron transmittance was distributed corresponding to the wavy pattern, referred to as `Hamon', particular to Japanese swords. Additionally, several line-like structures presumed to have been produced in the folding and forging processes were observed only in the modern Japanese sword. A detailed comparison of the results for the ancient and modern swords will be presented.
Reference:
[1] Shinohara, T.; Kai, T.; Oikawa, K.; Segawa, M.; Harada, M.; Nakatani, T.; Ooi, M.; Aizawa, K.; Sato, H.; Kamiyama, T.; Yokota, H., Sera, T., Mochiki, K., Kiyanagi, Y.; Final design of the Energy-Resolved Neutron Imaging System "RADEN" at J-PARC, J. Phys. Conf. Ser. 2016, 746, 012007.

Comparison of crystallographic structures of Japanese swords in Muromach and modern periods by using pulsed neutron imaging International conference

Y. Kiyanagi, K. Oikawa, H. Sato, K. Ohmae, P.H. Annh, K. Watanabe, Y. Matsumoto, T. Shinohara, T. Kai, S. Harjo, M. Ohnuma, S. Morito, T. Ohba, A. Uritani, M. Ito

11th World Conference on Neutron Radiography

名古屋大学における加速器BNCT用システム　－事業進捗状況と装置開発についてー

吉橋幸子、土田一輝、鬼柳善明、瓜谷章、渡辺賢一、山崎淳

第15回日本中性子捕捉療法学会学術大会

In vitro evaluation system for accelerator based BNCT

Jiatong Li,Kazuyo Igawa,Yasuaki Ichikawa,Syuichi Furuya,Toshiro Ono,Tadashi Hanafusa,Hideki Matui,Go Ichikawa,Kazuki Tsuchida,Yoshiaki Kiyanagi,Akihisa Ishikawa,Yuho Hirata,Sachiko Yoshihashi,Kenichi Watanabe,Akira Uritani,Ryo Ogawara,Mitsuru Suda,Tsuyoshi Hamano,Atunori Kamiya

Event date： 2018.9

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan

BNCT has been active in the world stage as an innovative method of radiotherapy in recent years. Neutron therapy with 10B has an excellent effect on different kinds of cancer which have a poor prognosis in conventional surgery, radiotherapy and chemotherapy. The first BNCT for the adenocarcinoma (mucoepidermoid carcinoma) which have a recurrence after surgery and radiotherapy and refused to use conventional radiotherapy for further treatment was reported the quality of life and survival rate is improved. However, there are few facilities to evaluate the BNCR for new cancer candidate in vitro. Therefore, we report the in vitro evaluation system using accelerator based BNCT.

BNCT用中性子源のLi封入型ターゲットの開発

本田祥梧、吉橋幸子、土田一輝、瓜谷章、渡辺賢一、山崎淳、鬼柳善明、辻義之、恒吉達矢

第15回日本中性子捕捉療法学会学術大会

Measurement of Neutron Spectrum using Activation Method in Deuterium Plasma Experiment at LHD International conference

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

9th Japan-Korea Seminar on Advanced Diagnostics for Steady-State Fusion Plasmas

Sensitivity and Linearity of Optical Fiber Type Neutron Detector Using a Small Piece of 6Li-Based Scintillator International conference

Ishikawa, Akihisa (1), Yamazaki, Atsushi , Watanabe, Kenichi, Yoshihashi, Sachiko (1), Uritani, Akira

2018 Symposium on Radiation Measurements and Applications

Radiation damage evaluation of the optical ber type OSL small size dosimeter using for the radiotherapy dosimetry International conference

Hirata, Yuho (1), Watanabe, Kenichi (1), Uritani, Akira (1), Yamazaki, Atsushi (1), Yoshihashi, Sachiko (1), Yanagida, Takayuki (2)

2018 Symposium on Radiation Measurements and Applications

Basic study on a LiF-Eu:CaF2 mixed power neutron scintillator International conference

Watanabe, Kenichi (1), Mitsuboshi, Natsumi (1), Ishikawa, Akihisa (1), Yamazaki, Atsushi (1), Yoshihashi, Sachiko (1), Uritani, Akira (1), Kawaguchi, Noriaki (2), Yanagida, Takayuki (2)

2018 Symposium on Radiation Measurements and Applications

Present Status of Nagoya University Accelerator Driven Neutron Source, NUANS International conference

Yoshiaki Kiyanagi, Kazuki Tsuchida, Daiki Furuzawa, Kazuya Sato, Atsushi Yamazaki, Sachiko Yoshihashi, Kenichi Watanabe, Akira Uritani, Yoshiyuki Tsuji, Tatsuya Tsuneyoshi

7th International Meeting of Union for Compact Accelerator-driven Neutron Sources UCANS-VII

Event date： 2018.3

Language：English Presentation type：Oral presentation (general)

Venue：Bariloche, ARGENTINA Country：Argentina

An accelerator driven neutron source is under construction at Nagoya University. There are two beam lines. The first beam line is used for the primary aim, namely, engineering feasibility study of a boron neutron capture therapy (BNCT) system. At the second beam line, physics and engineering applications are performed.
An electrostatic proton accelerator with 2.8MeV and 15 mA was installed. The first beam line was constructed and a proton beam of about 2 mA was transported successfully. We use Be targets at the second beam line and also at the first beam line at beginning. They were already manufactured. A Li target is used to obtain full neutron intensity at the first beam line. It is a shield type compact target with emboss structure. It was indicated that the cooling power with the use of a mechanism to enhance turbulent flow was enough at the full power operation. A filling system of Li is under testing. A beam shaping assembly (BSA) with a nozzle for BNCT has been designed. The BSA will make a patient setting easier and a patient more comfortable during irradiation. Designed performance fulfilled the IAEA recommendation.
We already got a license to produce the neutrons. However, to perform the neutron experiments, we are now constructing a shield room to set up the BSA. After completion of the room, we set up the first beam line completely and construct the second beam line.
In the presentation, outline of NUANS, accelerator status, target development, BSA design are explained.

Neutronic performance of a beam line for imaging at the electron linac facility in Kyoto University Research Reactor Institute International conference

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

7th International Meeting of Union for Compact Accelerator-driven Neutron Sources UCANS-VII

Event date： 2018.3

Language：English Presentation type：Poster presentation

Venue：Bariloche, ARGENTINA Country：Japan

A neutron beam line at the Kyoto University electron linac, KURRI-LINAC, has been updated for a project called N-DeMAIN (Development of Non-Destructive Methods Adapted for Integrity test of Next generation nuclear fuels). As a non-destructive method, neutron resonance transmission analysis is adopted for identification and quantification of nuclides in the fuels. Furthermore, the method is also used to measure temperature distribution in the fuels.
We redesigned a target-moderator-reflector system (TMRS) to suit for the imaging since it had been designed for nuclear data measurements. We first considered arrangement of a moderator to obtain highest neutron intensity. The neutron beam line exists at an angle of 135° with respect to the electron beam line. Therefore, we had two possibilities about a position of the moderator. One is to put a moderator near the target, and the other is at an angle perpendicular to the neutron beam line. In this case a distance between target and moderator become larger. We found that epithermal neutron intensity was much higher when the moderator was put near the target. However, it causes flight time difference of neutrons since neutron flight path length changes depending on emitted neutron positions on the moderator surface. This will make time resolution worse in the measurements of resonance peaks. Simulation results showed distorsion of neutron emission time distribution. However, it was found that the effect on a resonance peak was not so large. Simulations were also performed to check performance of a collimator system in a flight path and comfirmed the collimator system worked well. A measured neutron spectrum was almost the same as that of a simulation one. This indicates that the beam line was constructed as designed.
Here, we explain neutronic design studies and performance of the TMRS and the collimator system, and introduce some results of test experiments.

Neutronic performance of a beam line for imaging at the electron linac facility in Kyoto University Research Reactor Institute International conference

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

7th International Meeting of Union for Compact Accelerator-driven Neutron Sources UCANS-VII

Event date： 2018.3

Language：English Presentation type：Oral presentation (general)

Venue：Bariloche, ARGENTINA Country：Argentina

A neutron beam line at the Kyoto University electron linac, KURRI-LINAC, has been updated for a project called N-DeMAIN (Development of Non-Destructive Methods Adapted for Integrity test of Next generation nuclear fuels). As a non-destructive method, neutron resonance transmission analysis is adopted for identification and quantification of nuclides in the fuels.
We redesigned a target-moderator-reflector system (TMRS) to suit for the imaging since it had been designed for nuclear data measurements. We first considered position of a moderator to obtain highest neutron intensity since the neutron beam line exists at an angle of 135° with respect to the electron beam line. We found that epithermal neutron intensity was much higher when the moderator was put near the target. However, it causes flight time difference of neutrons due to position dependent flight path of the moderator surrface. Simulation results showed distorsion of emission time distribution. However, the effect on a resonance peak was not so large. Simulations were performed to check performance of a collimator system. A measured neutron spectrum was almost the same as that of a simulation one. This indicates that the beam line was constructed as designed.
Here, we explain neutronic design studies and performance of the TMRS and the collimator system, and introduce some results of test experiments.

TRUST Eu:LiCAF による多重円環構造を採用した中性子回折計の製

今井頌, 渡辺賢一, 山﨑淳, 吉橋幸子, 瓜谷章

日本原子力学会中部支部第 49 回研究発表会

Event date： 2017.12

Language：Japanese Presentation type：Oral presentation (general)

Venue：東桜会館 Country：Japan

TRUST Eu:LiCAFシンチレータの柔軟性を活かした小型かつおおきな立体角を有する中性子回折計を設計し、モンテカルロシミュレーション計算により、その基礎特性を評価した。

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<URITANI Akira>

Presentations -