Kaneko Junichi

Faculty of Engineering　Applied Quantum Science and Engineering　Quantum Engineering for MaterialsAssociate Professor
Last Updated :2025/11/06

■Researcher basic information

Nickname etc.

  • Junichi H. Kaneko

Degree

  • Doctor of Engineering, The University of Tokyo
  • Master of Business Administration, Otaru University of Commerce

Researchmap personal page

Home Page URL

J-Global ID

Research Keyword

  • シンチレータ
  • 耐放射線半導体デバイス
  • 放射線医用・医療工学
  • 放射線計測
  • 半導体検出器

Research Field

  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering), Electronic devices and equipment
  • Life sciences, Medical systems
  • Energy, Nuclear engineering

Educational Organization

■Career

Committee Memberships

  • 2010
    日本原子力学会, 標準委員会 原子燃料サイクル専門部会 臨界安全管理分科会 委員, Society

Position History

  • 経営戦略室室員, 2020年10月12日 - 2021年3月31日
  • 研究戦略室室員, 2017年4月1日 - 2019年3月31日
  • 研究戦略室室員, 2019年4月1日 - 2020年9月30日
  • 研究戦略室室員, 2020年10月12日 - 2022年3月31日
  • 産学・地域協働推進機構副機構長, 2017年4月1日 - 2023年3月31日
  • 総長補佐, 2017年4月1日 - 2019年3月31日
  • 総長補佐, 2019年4月1日 - 2020年9月30日
  • 総長補佐, 2020年10月12日 - 2022年3月31日
  • 総長補佐, 2022年4月1日 - 2024年3月31日

■Research activity information

Awards

  • Mar. 2015, 北海道大学, 教育総長賞・奨励賞　　　　　　　　　　　　　　　
    金子純一
  • Mar. 2015, 北海道大学, 研究総長賞 優秀賞　　　　　　　　　　　　　　　
    金子純一
  • Mar. 2014, 北海道大学, 研究総長賞　　　　　　　　　　　　　　　
    金子純一
  • Mar. 2012, 日本原子力研究開発機構, 先行基礎工学研究協力制度 表彰　　　　　　　　　　　　　　　
    GPS高エネルギー分解能シンチレータによる高信頼性α線波高弁別検出器の開発
    金子純一
  • 2008, 文部科学省, 先進的原子力･エネルギー教育取組、「教育支援活動」優秀賞　　　　　　　　　　　　　　　
    住吉 孝、奈良林 直、金子純一

Papers

Other Activities and Achievements

Books and other publications

  • ダイヤモンドエレクトロニクスの最前線　　　　　　　　　　　　　　　
    シーエムシー出版, 2008
  • Frontier of Diamond for Electronics Applications　　　　　　　　　　　　　　　
    CMC books, 2008
  • 放射線計測　　　　　　　　　　　　　　　
    第4章第3節第4項、"ダイヤモンド検出器"、p.p. 130-131.
    国際文献社, [Joint work]

Affiliated academic society

  • 医療物理学会　　　　　　　　　　　　　　　
  • 日本中性子科学会　　　　　　　　　　　　　　　
  • 応用物理学会　　　　　　　　　　　　　　　
  • ニューダイヤモンドフォーラム　　　　　　　　　　　　　　　
  • 日本原子力学会　　　　　　　　　　　　　　　

Research Themes

  • TlBr中の電荷捕獲準位解明と全吸収γ線エネルギースペクトロメータ開発への挑戦
    科学研究費助成事業 基盤研究(C)
    01 Apr. 2021 - 31 Mar. 2024
    金子 純一, 人見 啓太朗
    TlBrの原材料精製、単結晶育成をすすめた。4Nグレードの原材料を帯域精製中心に純化し、TlBr単結晶を育成した。このTlBr単結晶から検出器を作製し、共同研究先である東北大学と共同して電荷キャリア輸送特性等の評価を進めた。
    原材料精製、単結晶育成技術に各種改良を重ねた結果、電荷収集効率が大幅に改善した。精製や単結晶育成時の雰囲気に関する改良を段階的に進めると共に、帯域精製に関しては安定して300回の精製を行っている。単結晶育成も同様に信頼性のある炉の開発に成功した。世界的な半導体不足の影響を受け、装置開発が大分遅れたが、年度内に予定していた装置の改良は概ね完了した。
    662keVγ線を使用した実験では全吸収ピークがまだ立っていないことから、欠陥低減に加え、電極作製方法等の改善を今後進める。特に加工方法に関してはこれまでのアプローチを肯定する成果を得られたものと判断している。また電荷捕獲トラップを検証するための光照射I-V測定装置の開発も概ね予定通り進んでいる。直径0.5"のTlBr単結晶が安定して合成可能となったことから、今後の各種実験の進展も期待できる。


    今後は5Nグレードの原材料の使用なども予定しており、従来行ってきた欠陥低減や電極に関する実験を積極的に進め、実用的なTlBr半導体検出器の実現を目指す。さらに安定して測定が可能となったカソードルミネッセンス法に加え、光I-V測定により捕獲準位の定量的な研究に切り込んでいく。
    日本学術振興会, 基盤研究(C), 北海道大学, 21K12532
  • 遮蔽不要な臨界近接監視システム用ダイヤモンド中性子検出器の要素技術開発　　　　　　　　　　　　　　　
    英知を結集した原子力科学技術・人材育成推進事業
    Oct. 2020 - Mar. 2023
    田中真伸, 金子純一
    文部科学省, 課題解決型廃炉研究プログラム（一般研究））, 大学共同利用機関法人高エネルギー加速器研究機構, Coinvestigator
  • 過酷事故対応電子機器の実用化に向けた耐放射線・高温動作半導体デバイスの高性能化　　　　　　　　　　　　　　　
    原子力システム研究開発事業
    Oct. 2020 - Mar. 2023
    梅沢仁、金子純一
    文部科学省, ボトルネック課題解決型, 国立研究開発法人産業技術総合研究所, Coinvestigator
  • 耐放射線性ダイヤモンド半導体撮像素子の開発　　　　　　　　　　　　　　　
    英知を結集した原子力科学技術・人材育成推進事業
    Oct. 2019 - Mar. 2022
    大曲 新矢, 金子純一
    文部科学省, 共通基盤型原子力研究プログラム, 国立研究開発法人産業技術総合研究所, Coinvestigator
  • Realization of Cherenkov PET with photon-electron hybrid detectors using transparent semiconductors
    Grants-in-Aid for Scientific Research
    28 Jun. 2019 - 31 Mar. 2021
    Hitomi Keitaro
    Thallium bromo-chloride (TlBrCl) is a transparent semiconductor. TlBrCl crystals were grown by the traveling molten zone method using zone-purified materials in this study. Semiconductor detectors were fabricated from the TlBrCl crystals by evaporating electrodes on the crystals. A TlBr0.7Cl0.3 semiconductor detector exhibited an energy resolution of 6.4% full width at half maximum for 511-keV gamma rays at room temperature. A silicon photomultiplier (SiPM) was coupled optically to a TlBr0.3Cl0.7 semiconductor detector. The TlBr0.3Cl0.7 detector was irradiated with a 22Na gamma-ray source at room temperature. The gamma ray interacting with the detector material creates electron-hole pairs and Cherenkov photons simultaneously in the crystal. Simultaneous detection of the charge signal and the photon signal was achieved with the device in this study. The TlBrCl detectors are attractive for applications in positron emission tomography.
    Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Research (Exploratory), Tohoku University, 19K22942
  • 原子炉計装の革新に向けた耐放射線・高温動作ダイヤモンド計測システムの開発とダイヤモンドICの要素技術開発　　　　　　　　　　　　　　　
    原子力システム研究開発事業
    Oct. 2016 - Mar. 2020
    金子純一
    文部科学省, 安全基盤技術研究開発, 北海道大学, Principal investigator
  • Research and development of the next generation diamond pixel sensor
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
    01 Apr. 2016 - 31 Mar. 2019
    Tanaka Manobu, KOIZUMI satoshi, SHIMAOKA takahiro
    The development of a diamond detector with the charge collection efficiency(CCE) of ~100% was done, and the process requirements for developing a pixel detector based on diamond basis achieves less than 100-micron meter position resolution are investigated. Since the radiation tolerant transistors are necessary to integrate signal processing circuits on the pixel detector, total integrated dose characteristics of transistors are evaluated and confirmed those transistors have radiation resistivity more than 0.3MGy.
    A trend of accelerators R&D is high intensity/luminosity. From the viewpoint of the detection system, the radiation resistivity and the fast response are required. Si-based detectors are insufficient for the purpose. Diamond-based detectors can solve the problems. We succeeded to develop diamond detectors for those requirements and established the TCAD numerical model which can reproduce the I-V characteristics, the bias dependence of the CCE and the current signal waveform.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), High Energy Accelerator Research Organization, 16H03990
  • Development of a micro RI dynamic imaging system for living cells
    Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research
    01 Apr. 2016 - 31 Mar. 2018
    Yamaya Taiga, NISHIKIDO Fumihiko, NAKANISHI Takayuki
    Studies on cell regulation are attracting worldwide attention in order to realize regenerative medicine. Therefore, a nuclear medicine imaging method, which can use tracers having substantially the same composition as a target biomolecule, is required. In this research, we developed a nuclear medicine imaging system for dynamic cell observation. Specifically, in order to prevent broadening of the scintillation position because of scintillation light spreading in the scintillator, beta-rays are detected by a thin scintillator plate. A scientific CMOS camera with low readout noise and high resolution was used to detect scintillation light. The scintillator plate was a CsI crystal (150 micron thick) connected to an optical fiber (6 micron diameter) array. The scintillation light generated from the scintillator plate was extracted through optical fibers. Imaging results showed that our system has sufficient sensitivity for imaging uptake of fluorodeoxyglucose by single cells.
    Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Exploratory Research, National Institutes for Quantum and Radiological Science and Technology, 16K12886
  • Trial for neutron dosimetry from the atomic level by use of Diamond NV centers
    Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research
    01 Apr. 2015 - 31 Mar. 2017
    kaneko junichi, ONODA Shinobu, TUBOTA Masakatsu, TANAKA Manobu, SHIMAOKA Takehiro, SHINMYO Akihiro, HIRANO Shintaro, MIZUKOSHI Tsukasa
    In this study, we investigated the feasibility of atomic scale neutron dosimetry by measuring NV center in diamond which is generated by fast neutron irradiation and trace nitrogen in crystals by annealing. The sample was prepared by adding a trace amount of nitrogen during synthesis using microwave plasma CVD method. The sample after neutron irradiation or electron beam irradiation showed a strong increase of NV center, and density could not be quantified. NV center was concentrated on the growth surface side. This may be showed that the incorporation of nitrogen was large at the completion of synthesis. In order to perform dosimetry, it is necessary for nitrogen to be incorporated uniformly throughout the sample, so optimization of nitrogen uptake during CVD synthesis is indispensable.
    Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Exploratory Research, Hokkaido University, 15K14286
  • Development of wide gap semiconductor pixel detector for light dark matter search
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
    01 Apr. 2013 - 31 Mar. 2016
    Tanaka Manobu, KANEKO Junichi, SHIMAOKA Takehiro, OHSHIMA Takeshi, MAKINO Takakahiro, MIUCHI Kentaro
    We developed pixel detectors based on wide gap semiconductor materials(i.e. diamond and silicon carbide) for light dark matter search. The wide gap semiconductor containing carbon improves the sensitivity for light dark matter search.
    The electrode size of the detectors is about 100um x 100um. The detector shows two or three orders of magnitudes leakage reduction compared to a silicon pixel detector, and the detector capacitance of the diamond pixel is one half the silicon pixel detector. We confirmed developed pixel detectors have enough S/N for our purpose.
    In order to evaluate the detectors low noise front-end integrated circuit is developed.The equivalent noise charge(ENC) is less than 100 electron which satisfies S/N for our evaluation of the detectors.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), High Energy Accelerator Research Organization, 25400308
  • Development of the separation of nuclides by using nano-diamonds
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
    01 Apr. 2012 - 31 Mar. 2016
    WATANABE Masayuki, KANEKO Junichi
    In this study, we had focused on the adsorption of metal cation onto diamond surface. Objectives of this study is to elucidate the mechanism on the adsorption of rare earth cations, which is contained into the high level liquid waste generated by reprocessing spent nuclear fuels. Based on the dependence of acidity on the distribution coefficient of rare earth cations, and analysis of the adsorption isotherms and/or adsorption capacity, the adsorption of rare earth is mono-layer plain adsorption and the 1:1 stoichiometric proportion of the adsorption with ionic bonding nature.
    The investigation by XPS, FT-IR and TRLFS indicated the consistent results with the mechanism which stated above.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Japan Atomic Energy Agency, 24561045
  • Development of an inexpensive screening radiation detector for confidence in food
    Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research
    01 Apr. 2012 - 31 Mar. 2014
    KANEKO Junichi, TAKADA Eiji
    Confidence in food was required after broad area radiation contamination caused by nuclear accident in the Fukushim Daiichi nuclear power plant. In this study, an inexpensive radiation detector measuring radioactivity for retail shops and/or direct marketing farmers. This detector was designed to made best use of self-shielding of food itself. In size of 1.25 x 1.25 x 3.0 cm^3 of CsI(Tl) scintillator was assumed, and it was reveled to achieve screening level of 50 Bq/kg within 22 minute for rice in 5 kg. In addition, it took only several minutes to determine that radioactivity is lower than 100 Bq/kg.
    Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Exploratory Research, Hokkaido University, 24658113
  • Development of radiation detectors based on crystal growth of CVD single diamond combined with a lift-off method
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
    2010 - 2012
    KANEKO Junichi, FUJITA Fumiyuki, SHIKATA Shinichi, SASAO Mamiko, SATO Satoshi, ISOBE Mitsutaka, NAKAI Mitsuo, ASANO Yoshihiro, ISHIKAWA Masazumi
    Growth condition of CVD diamond single crystals were optimized. Radiation detectors were fabricated form the grown CVD diamonds; then induced charge collection distribution measurement for the detectors were carried out by use of alpha particles. Charge collection efficiency of 100 % and 97 %, μτ values of 1×10-4 and 9.6×10-6 cm2/V for holes and electrons were achieved by one of the best detectors. In addition, energy resolution of 3.5 % at a peak caused by the 12C(n, alpha)9Be reactions were obtained in response function measurement for 14 MeV neutrons. Fast time resolution of 350 ps was also achieved for 8 GeV electron beams.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 22360395
  • Study on change of transmission cross sections and development of new application field in spectroscopic imaging using a pulsed neutron transmission method
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
    2008 - 2010
    KIYANAGI Yoshiaki, FURUSAKA Michihiro, KAMIYAMA Takashi, MOCHIKI Kohichi, HIRAGA Fujio, KANEKO Junichi, IWASE Kenji, HARADA Masahide, OOI Motoki, SATO Setso, SAGEHASHI Hidenori
    It has been clarified that texture in metals reflects the neutron transmission cross section and the world's first analysis code for deducing quantitative information of the texture, crystallite size and strain has been developed. By using this code texture and crystallite size of a welded iron were investigated, and also texture, crystallite size and strain of iron during in-situ tensile test were successfully imaged. Furthermore, a camera system applicable to a pulsed neutron source has been developed.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, 20246136
  • CVD単結晶ダイヤモンド合成に基づくDT中性子エネルギースペクトロメータの開発
    科学研究費助成事業 特定領域研究
    2008 - 2009
    金子 純一, 藤田 文行, 本間 彰
    今年度は前年度良い結果の出たリフトオフ法を北海道大学に導入することを第一目標として研究を行った。Ib型基板を使用して連携研究先である産業技術研究所と同一の合成条件でCVD単結晶の合成を行った。合成した試料をリフトオフ法により自立膜化した。さらに化学処理ならびに電極製作を行い、検出器とした。製作した検出器に対してI-V測定、α線応答測定を行った。十分な印加電圧がかかり、α線に対して16%程度ではあるがピークの立つ応答を示す検出器の製作に成功した。今後、高品質基板を使用し、合成条件の最適化を進め実用的な人工ダイヤモンド放射線検出器の実現を目指す。
    また合成した結晶中の電荷捕獲準位を同定するための積極的電荷捕獲を利用した光I-V測定法の改良をすすめ、ある程度信頼性のあるデータが取得できる状況に達した。
    日本学術振興会, 特定領域研究, 北海道大学, 20026001
  • Improvement of Quantification in PET and Development of a Noninvasive Blood Radioactivity Monitor
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
    2007 - 2009
    KUBO Naoki, KATOH Chietsugu, KANEKO Jyunichi, KIMURA Ayaka, NAKAMARU Hiroshi
    We have investigated a new noninvasive blood-radioactivity monitor. The monitor estimates the input functions for quantitative PET by sequentially measuring the radioactivity of the radial artery. Thus, we indicated that a PET scan is more comfortable for patients.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 19591394
  • Basic Research for four-dimensional stereotactic radiotherapy
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Priority Areas
    2005 - 2009
    SHIRATO Hiroki, KANEKO Junichi, NISHIYAMA Syusuke, KATOH Chietsugu, AOYAMA Hidefumi, SEKI Koh-ichi, ONIMARU Rikiya, NISHIOKA Takeshi, MORITA Koichi, DATE Hiroyuki, TAKADA Eiji, TOMIOKA Satoshi, KUDO Kohsude, ONODERA Yuya, KAMISHIMA Tamotsu, ONIMARU Rikiya, SHIMIZU Shinichi, SAKUHARA Yusuke, OYAMA Noriko, ABO Daisuke, TAGUCHI Hiroshi
    We developed a four-dimensional (4-D, space and time) focal positron emission localizer, FPEL, using two sets of BGO scintillators, photo-electric multiplier, and collimators. A narrow (5-mm in diameter) 45-MeV electron beam was controlled to irradiate a target with an accuracy of 0.1mm in 4D coordinates automatically if the amount of positron emitters at the target exceeds the threshold. A mouse model was established to irradiate the tumor in which FDG is accumulated. Using the FPEL, 45-MeV electron beam hit the tumor in mice which move in front of the beam exit with the amplitude resembling human respiration. Tumor without fiducial gold marker disappeared within a week after the irradiation. Basis for 4D stereotacic radiotherapy was established successfully.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research on Priority Areas, Hokkaido University, 17016002
  • The formation process of a new ordered structure in complex plasmas
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
    2007 - 2008
    FUJITA Fumiyuki, FURUSAKA Michihiro, KANEKO Junnichi, NISHIYAMA Shuusuke
    定在縞を持つ陽光柱プラズマという秩序状態に、外部から微粒子を導入することでコンプレックスプラズマとする。このプラズマにおける新たな秩序状態(プラズマクリスタル)形成過程を実測し、データ解析を行った。安定な結晶が生成される放電条件で放電させておき、直径10μmの微粒子を落下させると、プラズマ内で微粒子の浮遊が起こり、次いで"気体または液体状態"となり、落下後数十秒以内でプラズマクリスタル状態へ移行していくことを観測した。この新たな秩序の形成過程を評価するために、画像データから対相関関数(動径分布関数)を求めるアルゴリズムを開発した。
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 19540389
  • Interactive Radiotherapy
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
    2006 - 2008
    SHIRATO Hiroki, HONMA Sato, TAMAKI Nagara, KUGE Yuji, DATE Hiroyuki, KIYANAGI Yoshiaki, HATAKEYAMA Masanori, KANEKO Junichi, MIZUTA Masahiro, INUBUSHI Masayuki, TADANO Shigeru, TAMURA Mamoru, HAYAKAWA Kazushige, MATSUNAGA Naofumi, ISHIKAWA Masayori, AOYAMA Hidefumi, SAKUHARA Yusuke, ONIMARU Rikiya, ABO Daisuke, OITA Masataka, KAMISHIMA Tamotsu, TERAE Satoshi, KUDO Kohsuke, ONODERA Yuya, OMATSU Tokuhiko, SHIMIZU Shinichi, NISHIMURA Takashi, SUZUKI Ryusuke, GERARD Bengua
    いままでの先端放射線医療に欠けていた医療機器と患者のinteractionを取り入れた放射線治療を可能にする。臓器の動き・腫瘍の照射による縮小・免疫反応などは、線量と時間に関して非線形であり、システムとしての癌・臓器の反応という概念を加えることが必要であることが示唆された。生体の相互作用を追求していく過程で、動体追跡技術は先端医療のみならず、基礎生命科学でも重要な役割を果たすことがわかった。
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, 18209039
  • DT中性子計測への応用をめざしたCVD単結晶ダイヤモンド厚膜の合成と評価
    科学研究費助成事業 特定領域研究
    2006 - 2007
    金子 純一, 藤田 文行, 本間 彰, 藤森 直治
    今年度は人工ダイヤモンド放射線検出器実現を目指し、CVD単結晶ダイヤモンド厚膜の合成と評価を行った。高圧高温合成Ib型基板を使用し、800度・1100度、80Torr・110Torrの4点でダイヤモンドを合成した。合成の主目的はダイヤモンドの{111}面の成長率と{100}面の成長率の比であるα値の把握である。α値によって結晶のモルフォロジーや不純物の取り込みに大きな違いが生じることが知られている。
    合成したダイヤモンドのα値は1.6〜4.9に分布した。ラマン分光の結果、全ての試料でダイヤモンドのsp^3結合によるピークが観測された。800度で合成した試料についてはグラファイト成分、窒素と空孔のペアによるNV発光が観測された。また、これら二つの試料については、結晶表面上に平行電極を蒸着により製作し印加電圧をかけた状態でα線を入射させた。この結果、α線により生成した電荷キャリアのドリフトにより信号が出ることを確認した。
    さらに、高品質なダイヤモンドの合成を目指し、800度、110Torr、メタン濃度1%での合成をおこなった。その結果、ラマン分光ではグラファイト、NV発光は観測されなかったが、多結晶体的な表面形態をもった結晶であり、α線測定については漏れ電流が大きく信号が出なかった。
    今年度の研究の結果、α値3〜4の範囲を集中的にサーベイを行なう必要があるとの結論に至った。次年度以降は低メタン濃度における長時間合成を行なっていく。
    日本学術振興会, 特定領域研究, 北海道大学, 18035001
  • New Material Characterization method by Using a pulsed Neutron Transmission Spectroscopic Radiography
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
    2005 - 2007
    KIYANAGI Yoshiaki, KAMIYAMA Takashi, KANEKO Jyunichi, TOMIOKA Satoshi, TAKENAKA Nobuyuki, FURUSAKA Michihiro
    Spectroscopic neutron radiography using a pulsed neutron can give structural information of materials since it has neutron cross section data at each pixel. Especially, at low energy region of the cross section Bragg edges appear which reflect the crystal structure of the materials. The shift of the Bragg position gives strain of the crystal. We performed the experiment on the iron sample which would have strain due to bending. We could clearly observe the strain position and amount of the strain. It was found that the strain appeared on specific crystal planes. It is also indicated that the total neutron cross section around the Bragg edge depended on the grain size of the crystalitte and showed that the cross section decreased proportional to the grain size by a model experiment. Furthermore, the crystal structural change around the welded position of the SS-Iron sample and Iron-Iron sample. The crystal structure change had similar tendency in both sample. Naturally, far from the weld position the cross section showed the typical feature of Bragg edges of iron and SS, as approaching the weld position the edge became sharper, and at weld position the edge had a sharp edge implying the isotropic distribution of the crystallittes. On the other hand, at high energy we can utilize the resonance absorption to get image of elements or nuclei. We performed transmission measurement of the heavy material to get CT image, and it is suggested that the method was also useful for imaging the element distribution and also that we may use this to measure the temperature by analyzing the resonance peak. We developed the sensor of the imaging detector based on Gd composite. We succeeded in making a test detector and also obtained images by using the neutron beam.
    As mentioned above, the spectroscopic neutron imaging using the pulsed neutron sources are very powerful tool to investigate micro structure of the materials, such as strain, crystallite size, distribution of crystallite and so on. Now, the operation of the big proton accelerator neutron source is just about to take place. We will get much higher quality data by using such high intensity sources and also get much detailed information about the sample materials. Therefore, we are now on the stage to develop the method further to promote the industrial applications.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, 17206096
  • Development of neutron phase space transfer optical devices
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
    2005 - 2007
    KANEKO Junichi, FURUSAKA Michihiro, FUJITA Fumiyuki, KIYANAGI Yoshiaki, KAMIYAMA Takashi, OTAKE Yoshie
    Changes in neutron intensity and diffraction angle form a vibrating quartz single crystal were investigated by a 2D neutron detector and time-of-flight method.
    A X-cut quartz single crystal in size of 3mm×120mm×14mm was used in an experiment. Quartz single crystal has polarization according to a X-axis, thus, perpendicular cut to this axis, I.e., X-cut has the largest displacement. Bias voltage of 40 V was applied to aluminum electrodes fabricated on the quartz crystal, and it was moved in the characteristic vibration frequency of 22.7 kHz. Maximum displacement of c.a. 5μm was observed using a microscope.
    A neutron diffraction experiment was carried out on the ULS (Ultra Small angle neutron scattering) system in JRR-3M; neutron beam of wavelength of 4.7 angstrom was used. A combination of a ZnS:Li scintillator and a position sensitive photo multiplier was used as a neutron detector. Neutron diffraction patterns were obtained with a vibrating quartz single crystal in 22.7 kHz; change of neutron diffraction patterns according to vibration period. Neutron intensity had two strong components. Velocity of 4.7 angstrom neutrons are c.a. 840 m/s, thus they move 1.8 cm in 44μs, I.e., a half of the vibration period. By change of 1.8 cm in position of the detector, neutron intensity was changed according to phase shifting in pi.
    Experimental results were compared with theoretical estimation. In the case of displacement caused by the Doppler effect was larger than that caused by deformation, experimental results of time dependence of diffracted neutrons' intensity were suit for a theoretical result.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 17360448
  • DT中性子計測への応用を目指した高品質単結晶ダイヤモンドの合成と特性評価
    科学研究費助成事業 特定領域研究
    2005 - 2005
    金子 純一, 藤田 文行
    本研究では二つのテーマについて研究を行った。一つ目のテーマである高品質単結晶ダイヤモンドの合成と評価では、超高純度原料をもちいた高圧高温合成単結晶ダイヤモンドの合成と評価を行い非ダイヤモンド原料を使った場合、結晶性に問題が生じる可能性があること、現状の技術ではHP/HT法によってエネルギースペクトロメータグレードの単結晶ダイヤモンドを造ることはペンディングとすべきであるものの、CVD単結晶合成用の基板としては極めて有望であることを明らかにした。また高品質CVD単結晶ダイヤモンドの合成と評価を行った結果、透明な大面積基板は歩留まりよく合成可能であるものの電気特性向上を狙った合成条件の探求が必要であることがわかった。
    二つ目のテーマである電荷捕獲準位同定手法の開発では試料に対する電荷捕獲をあらかじめ行ったうえで、光電流測定を行い、捕獲準位のエネルギー同定を行う測定方法確立の目処を立てた。紫外線とWランプからの単色光を用いた不純物準位の評価技術の開発を行い、超高純度HP/HTダイヤモンド及びCVDダイヤモンドの計測を行った。外気導入による冷却によって試料温度を0℃付近まで下げることで熱雑音を1桁減らし、数100fAの電流計測を可能にした。この方法は従来に無い極めて優れた方法であり、高品質ダイヤモンド合成のために完成を目指すべき手法といえる。
    日本学術振興会, 特定領域研究, 北海道大学, 17044001
  • Development of layered type CVD single aystal diamond radiation detectors
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
    2003 - 2004
    KANEKO Junichi, SAWAMURA Teruko, ITO Toshimichi, TERAJI Tokuyuki
    In this fiscal year, improvement on fabrication of layred type CVD diamond radiation detectors. In the previous year, we tried to fabricate the layred type CVD single diamond radiation detector by using a high-quality boron doped diamond layer that was flat in atom scale. However, this trial was failed because abnormal growth on the boron doped layer. Thus, we applied previously used process for fabrication of boron-doped layer. In this process, we found out that grown diamond layer obtained large influence from surface morphology of a type Ib single diamond substrate. Then, we evaluate a relation between mechanical polishing process and grown diamond layer. In previously used process, type Ib diamond substrate mechanically polished for one direction was used. Recently a diamond substrate supplier changed their way to polish a diamond substrate. The supplier polished a diamond substrate from random directions in order to obtained better optical flatness. However, this process destroyed surface crystal structure, and it resulted in bad quality in grown diamond layer. Then we asked to change the substrate supplier for their polishing process for suitable way to diamond growth, and it resulted in better growth of diamond layer. In addition, we tried to fabricate a layered type CVD diamond radiation detector by using high-quality single diamond substrate. This substrate include only 0.1 to 0.3 ppm of boron impurities and it was semiconductor. Moreover, charge carriers' transport phenomenon measurement system 213 nm UV pulse laser system was developed. Charge carriers' transport phenomenon in the layered type diamond radiation detectors, single and polycrystalline diamond were evaluated by using this system. 14 MeV neutron response function measurements using the layered type CVD single diamond radiation detector was carried out.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 15360498
  • Development of high efficiency pursed neutron source by using a new material of methane hydrate
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
    2002 - 2004
    KIYANAGI Yoshiaki, KAMIYAMA Takashi, HIRAGA Fujio, SAWAMURA Teruko, KANEKO Junichi, FURUSAKA Michihiro
    Methane hydrate has been expected as a cold neutron moderator material giving higher intensity over wide energy range. We have performed experimental studies mainly. We measured neutron inelastic scattering at ISIS in UK to know the neutron cross-section characteristics. The methane molecule in methane hydrate seemed to rotate freely since the rotational energy level was 1.1meV which is almost same as the energy level of free rotation of methane. We could deduce the translational modes in the small and large ice cages. The ice vibrational mode and librational mode in methane hydrate were almost similar to those of ice In although there existed small distortion. These data suggested that methane hydrate cross section can be simulated linear combination of cross sections of both materials. As a moderator the effect of methane is important but the content of methane is not so high in methane hydrate.
    So, we performed moderator experiments to observe the neutronic performance of methane hydrate. We studied a coupled and a decoupled moderators. Methane and hydrogen moderator data were also obtained fro the comparison. In the case of the coupled moderator, the shape of the energy spectrum of methane hydrate was similar to that of ice, the peak energy of methane hydrate moderator was little bit higher than those of other materials of methane and hydrogen. Spectral intensity around the cold neutron region was much lower than other materials. However, around the thermal neutron region the intensity was higher. In the case of the decoupled moderator the spectral intensity was approaching that of hydrogen moderator but much lower than methane. The pulse width of emission time was much wider than other moderators. Therefore, it will be concluded that the methane hydrate moderator does not have so good characteristics as a cold moderator and can give higher intensity at higher energy region.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), HOKKAIDO UNIVERSITY, 14380229
  • 医用原子力　　　　　　　　　　　　　　　
    2004
    Competitive research funding
  • Nuclear engineering for radiation therapy and diagnostics　　　　　　　　　　　　　　　
    2004
    Competitive research funding
  • 中性子散乱実験用高速・高位置分解能二次元中性子検出器開発のための基礎研究
    科学研究費助成事業 萌芽研究
    2002 - 2003
    金子 純一, 片桐 政樹
    今年度は前年度行なったGd金属箔の検出効率が思うように上がらなかったことから、Gd系シンチレータの薄膜化とMCPの組み合わせについて実験的に研究を進めた。Gd金属箔からの内部転換電子は1方向へのみ放出された分がMCPに入射可能となる。一方、Gd系シンチレータを使用した場合は、内部転換電子がシンチレータ内で光に変換されるため、光の取り出しを上手く行なうことで4π方向に出た内部転換電子を全て捉えることができる。この方法をもちいた場合、最大の問題となるのがMCPが直接γ線や中性子線と反応することである。この部分については北大ライナックならびに高エネルギー加速器研究機構KENSにおける実験を行い、MCPが直接反応した場合の信号の減衰時間(数ns)とシンチレータの減衰時間(数10ns)程度の違いをもちいて弁別できることを確認した。またシンチレータの薄膜化については、今後さらに進める必要があるものの、焼結手法によって中性子をほぼ100%捕獲し、γ線の影響を最低限に抑えられる30μmの厚さを得るめどを立てた。このシンチレータは焼結条件によって発光強度と透明度が変わることが分かっている。この部分については今後、合成条件の最適化をすすめる必要がある。本研究は今年度で終了するが、Gd系シンチレータとMCPを組み合わせることで、中性子イメージングを行なえる基礎的実証データを積み上げることに成功し、初期の目的を達成することが出来た。今後、さらに100μm以下の位置分解能をもち、残留応力測定等に使える中性子イメージング装置の開発につなげていく必要がある。
    日本学術振興会, 萌芽研究, 北海道大学, 14658142
  • 酸化物シンチレータの開発　　　　　　　　　　　　　　　
    2001
    Competitive research funding
  • development of oxide scintillators　　　　　　　　　　　　　　　
    2001
    Competitive research funding
  • 中性子散乱実験用中性子検出器・中性子光学素子の開発　　　　　　　　　　　　　　　
    1999
    Competitive research funding
  • Development of neutron detectors and neutron optics　　　　　　　　　　　　　　　
    1999
    Competitive research funding
  • 人工ダイヤモンド放射線検出器の開発　　　　　　　　　　　　　　　
    1994
    Competitive research funding
  • Development of synthetic diamond radiation detectors　　　　　　　　　　　　　　　
    1994
    Competitive research funding

Industrial Property Rights

  • 放射線計測方法及び放射線計測装置
    Patent right, 井▲崎▼ 賢二, 森下 祐樹, 山崎 巧, 金子 純一, 樋口 幹雄, 坪田 陽一, 山本 誠一, 石橋 浩之, 国立研究開発法人日本原子力研究開発機構, 国立大学法人北海道大学
    特願2015-028396, 17 Feb. 2015
    特開2016-151454, 22 Aug. 2016
    特許第6524484号, 17 May 2019
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  • 単結晶、放射線検出器及び放射線検出器の使用方法
    Patent right, 石橋 浩之, 志村 直明, 金子 純一, 坪田 陽一, 樋口 幹雄, 西山 修輔, 株式会社オキサイド, 国立大学法人北海道大学
    特願2014-029357, 19 Feb. 2014
    特開2015-151535, 24 Aug. 2015
    特許第6303146号, 16 Mar. 2018
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    Patent right, 金子 純一, 樋口 幹雄, 嶋岡 毅紘, 坪田 陽一, 井崎 賢二, 国立大学法人北海道大学, 国立研究開発法人日本原子力研究開発機構
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  • ダイヤモンド半導体デバイス
    Patent right, 金子 純一, 坪田 雅功, 梅澤 仁, 鹿田 真一, 坪内 信輝, 小泉 聡, 国立大学法人北海道大学, 国立研究開発法人産業技術総合研究所, 国立研究開発法人物質・材料研究機構
    特願2014-265640, 26 Dec. 2014
    特開2016-127088, 11 Jul. 2016
    201603014067241039
  • 動的腫瘍の放射線治療装置および動的腫瘍の放射線治療プログラム
    Patent right, 金子 純一, 白土 博樹, 藤田 文行, 高田 英治, 国立大学法人北海道大学, 独立行政法人国立高等専門学校機構
    特願2009-500232, 21 Feb. 2008
    WO2008-102843, 28 Aug. 2008
    特許第5113828号, 19 Oct. 2012
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  • 単結晶シンチレーター
    Patent right, 上田 俊輔, 石橋 浩之, 蔵重 和央, 金子 純一, 樋口 幹雄, 川村 宗範, 佐伯 掌平, 日立化成工業株式会社, 国立大学法人 北海道大学
    特願2008-050385, 29 Feb. 2008
    特開2009-074039, 09 Apr. 2009
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  • 入力関数測定装置　　　　　　　　　　　　　　　
    Patent right
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  • 小型Ｘ線発生装置　　　　　　　　　　　　　　　
    Patent right
    特許公開２００９－２８３１６９
  • 単結晶シンチレータ　　　　　　　　　　　　　　　
    Patent right
    特願2008-050385
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    Patent right
    特願2007-041373
  • 中性子線検出器　　　　　　　　　　　　　　　
    Patent right
    特開２００４－１８４１０４
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    Patent right
    特許公開２００２－６２３６０