Study on high resolution and large diameter crystal growth of phase-separated scintillator with light guiding property by controlling the order structure

• Project/Area Number: 16H04505
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Composite materials/Surface and interface engineering
• Research Institution: Tohoku University
• Principal Investigator: Yoshikawa Akira 東北大学, 金属材料研究所, 教授 (50292264)
• Co-Investigator(Kenkyū-buntansha): 黒澤 俊介 東北大学, 未来科学技術共同研究センター, 准教授 (80613637)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000); Fiscal Year 2018: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000); Fiscal Year 2017: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000); Fiscal Year 2016: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
• Keywords: シンチレータ / X線検出器 / 共晶体 / 結晶成長 / 超高解像度放射線検出器 / X 線位相イメージング / 形状制御結晶成長 / 結晶工学 / 放射線検出 / イメージング / 一方向凝固 / 医療画像装置 / 放射線 / X線

Outline of Final Research Achievements

We have studied on phase-separated eutectic scintillator and developed the 1μm resolution detector. ① On the basis of GdAlO3/ Al2O3 composition, we optimized the eutectic composition and growth direction by considering the crystal structure change with cation substitutions and the acceptable angular errors between each phases. ② We succeeded to grow phase-separated eutectic crystal with large diameter by the micro-pulling down method and EFG method. ③ X-ray phase-imaging detector combined with a CCD camera was developed and prove our concept “super high resolution using phase-separated eutectic scintillation detector”.

Academic Significance and Societal Importance of the Research Achievements

本研究では、光導波性獲得を目標とした、元素置換による構造制御、配向性制御を系統的に研究した。共晶相の微細組織をバルクのスケールで制御するには共晶相図、界面の方位制御、面内温度分布の均質性等が相互に影響しあうため、その体系的な理解は結晶成長研究分野における学術的な意義も大きい。今回開発したX線位相イメージング検出器は従来見えなかった癌病巣、高齢者に患者が多い関節リウマチ・変形性膝関節症における軟骨という軟組織のX線位相イメージングを可能となる装置の実現に繋がり、早期発見により重症化前治療を可能にすることで生活の質（QOL）の向上に資する。

Research Products

• [Int'l Joint Research] Institute of Physics(チェコ)
• [Int'l Joint Research] University Lyon 1(フランス)
• [Int'l Joint Research] Lawrence Berkeley National Laboratory(米国)
• [Int'l Joint Research] Institute of Physics AS CR(チェコ)
• [Journal Article] Thermoelectric properties of Nb-doped SrTiO?/TiO? eutectic solids fabricated by unidirectional solidification (2019)
  • Author(s): Y. Yokota, S. Horii, H. Ogino, M. Yoshino, A. Yamaji, Y. Ohashi, S. Kurosawa, K. Kamada, A. Yoshikawa
  • Journal Title: J. Electron. Mater. Volume: accepted Issue: 4 Pages: 1-6
  • DOI: 10.1007/s11664-018-06880-2
  • Peer Reviewed
• [Journal Article] Growth and characterization of directionally solidified eutectic systems for scintillator applications (2018)
  • Author(s): Yoshikawa Akira、Kamada Kei、Kurosawa Shunsuke、Yokota Yuui、Yamaji Akihiro、Chani Valery I.、Ohashi Yuji、Yoshino Masao
  • Journal Title: Journal of Crystal Growth Volume: 498 Pages: 170-178
  • DOI: 10.1016/j.jcrysgro.2018.02.032
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Ultrahigh resolution radiation imaging system using an optical fiber structure scintillator plate (2018)
  • Author(s): Yamamoto Seiichi、Kamada Kei、Yoshikawa Akira
  • Journal Title: Scientific Reports Volume: 8 Issue: 1 Pages: 1-10
  • DOI: 10.1038/s41598-018-21500-z
  • Peer Reviewed / Open Access
• [Journal Article] Optimization of Dopants and Scintillation Fibers’ Diameter of GdAlO3/<inline-formula> <tex-math notation="LaTeX">$\alpha$ </tex-math> </inline-formula>-Al2O3 Eutectic for High-Resolution X-Ray Imaging (2018)
  • Author(s): Kamada Kei、Yasui Nobuhiro、Ohashi Yoshihiro、Den Toru、Yamaguchi Hiroaki、Yamaji Akihiro、Shoji Yasuhiro、Yoshisno Masao、JinKim Kyoung、Kurosawa Shunsuke、Ohashi Yuji、Yokota Yuui、Yoshikawa Akira
  • Journal Title: IEEE Transactions on Nuclear Science Volume: 65 Issue: 8 Pages: 2036-2040
  • DOI: 10.1109/tns.2018.2841026
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Growth and scintillation properties of Eu doped LiSrI 3 /LiI eutectics (2017)
  • Author(s): Kamada Kei、Chiba Hiroyuki、Yoshino Masao、Yamaji Akihiro、Shoji Yasuhiro、Kurosawa Shunsuke、Yokota Yuui、Ohashi Yuji、Yoshikawa Akira
  • Journal Title: Optical Materials Volume: 68 Pages: 70-74
  • DOI: 10.1016/j.optmat.2017.05.010
  • Peer Reviewed
• [Journal Article] Growth of LiF/LiBaF3 eutectic scintillator crystals and their optical properties (2017)
  • Author(s): Shunsuke Kurosawa, Akihiro Yamaji, Jan Pejchal, Yuui Yokota, Yuji Ohashi, Kei Kamada, and Akira Yoshikawa
  • Journal Title: J. Mater. Sci. Volume: 52 Issue: 10 Pages: 5531-5536
  • DOI: 10.1007/s10853-017-0815-1
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Growth and scintillation properties of Tb doped LiGdF4/LiF eutectic scintillator (2016)
  • Author(s): Kei Kamada, Kosuke Hishinuma, Shunsuke Kurosawa, Akihiro Yamaji, Yasuhiro Shoji, Yuji Ohashi, Yuui Yokota, Akira Yoshikawa
  • Journal Title: Opt. Mat. Volume: 61 Pages: 134-138
  • DOI: 10.1016/j.optmat.2016.09.019
  • Peer Reviewed
• [Presentation] Development of growth technique for Tb doped GdAlO3/α-Al2O3 eutectic scintillator (2018)
  • Author(s): Kei Kamada, Hiroaki Yamaguchi, Akihiro Yamaji, Masao Yoshino, Shunsuke Kurosawa, Yasuhiro Shoji, Yuui Yokota, Yuji Ohashi, Akira Yoshikawa
  • Organizer: Sixth European Conference on Crystal Growth (ECCG6)
  • Int'l Joint Research
• [Presentation] 新規ハロゲン化物シンチレータ開発を目的としたBaI2-LuI3状態図の作成と結晶育成 (2018)
  • Author(s): 折口 和也、横田 有為、吉野 将生、山路 晃広、大橋 雄二、黒澤 俊介、鎌田 圭、吉川 彰
  • Organizer: 第79回応用物理学会 秋季学術講演会
• [Presentation] BaI2-LuI3混合物の溶融凝固時の相形成と熱的挙動 (2018)
  • Author(s): 折口和也、横田有為、吉野将生、 山路晃広、大橋雄二、 黒澤俊介、鎌田圭、吉川彰
  • Organizer: 第47回結晶成長国内会議（JCCG-47）
• [Presentation] Growth, optical and scintillation properties of directionally solidified eutectic systems (2017)
  • Author(s): Akira Yoshikawa
  • Organizer: Phosphor Safari and the 6th International Workshop on Advanced Spectroscopy and Optical Materials (PS-IWASOM)
  • Int'l Joint Research
• [Presentation] Growth and characterization of directionally solidified eutectic systems for scintillator application (2016)
  • Author(s): Akira Yoshikawa, Kei Kamada, Shunsuke Kurosawa, Yuui Yokota, Akihiro Yamaji, Valery I Chani, Yuuji Ohashi
  • Organizer: 5th International Workshop on Directionally Solidified Eutectic Ceramics
  • Place of Presentation: Warsaw, Poland
  • Year and Date: 2016-04-03
  • Int'l Joint Research / Invited