Pr:LuAGの透明セラミックス化による特性向上

• Project/Area Number: 20656103
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Single-year Grants
• Research Field: Inorganic materials/Physical properties
• Research Institution: Tohoku University
• Principal Investigator: 吉川 彰 Tohoku University, 多元物質科学研究所, 准教授 (50292264)
• Project Period (FY): 2008 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥3,500,000 (Direct Cost: ¥3,500,000); Fiscal Year 2009: ¥1,500,000 (Direct Cost: ¥1,500,000); Fiscal Year 2008: ¥2,000,000 (Direct Cost: ¥2,000,000)
• Keywords: 結晶工学 / 先端機能デバイス / 放射線・X線・粒子線 / 医療・福祉

Research Abstract

申請者を中心とした研究グループが見出した単結晶Pr:LuAGシンチレータは、高い阻止能、BGO比約3倍の発光量、早い減衰時定数が特徴であるが、その性能向上が限界に達しつつある現在、Pr:LuAGは透明セラミックス化することで確実に特性が向上することが予想される。単結晶Pr:LuAGでは、欠陥からの発光に起因する減衰の遅い成分が、PET等の高速応答が要求される装置開発において問題となってきたが、上述の申請者の研究室の柳田助教らの研究により、セラミックス化することで欠陥が光学測定において有意に検出できないほど低減させられることも明らかになっている。加えて、Pr:LuAGの作製には高融点が必要であり、単結晶作製においては技術的に困難な一面となるが、焼結法により作られるセラミックスでは、これは寧ろ作製時に有利な点となる。本研究においては、透明(透過率80%以上)セラミックスの開発に成功し、APD等の受光素子と合せて、放射線応答が発光量、エネルギー分解能共に現状の構成(単結晶LuAG+PMT)を凌駕することに成功した。

Research Products

• [Journal Article] Development of Pr:LuAG scintillator array and assembly for Positron Emission Mammography (2010)
  • Author(s): Takayuki Yanagida, Akira Yoshikawa, Yuui Yokota, Kei Kamada, Yoshiyuki Usuki, Seiichi Yamamoto, Masayasu Miyake, Mamoru Baba, Kazuaki Kumagai, Katsuhisa Sasaki, Masatoshi Ito, Naoto Abe, Yutaka Fujimoto, Shuji Maeo, Yuki Furuya, Hidehiko Tanaka, Akihiro Fukabori, Targino Rodrigues dos Santos, Motoharu Takeda, Noriaki Ohuchi
  • Journal Title: IEEE Trans.Nucl.Sci. (In press, 未定)
  • Peer Reviewed
• [Journal Article] Functional Possibilities of Inorganic-Organic Hybrid Scintilator ; Pr:LuAG Scintillator Covered with Plastic Scintillator (2010)
  • Author(s): A.Yoshikawa, T.Yanagida, Y.Yokota, K.Kamada, Y.Usuki, M.Nikl
  • Journal Title: IEEE NSS MIC 2009, Conference Record (In press, 未定)
  • Peer Reviewed
• [Journal Article] Large Size Single Crystal Growth of Pr:Lu3Al5O12 and Their Uniformity of Scintillation Properties (2010)
  • Author(s): K.Kamada, K.Tsutsumi, T.Yanagida, T.Endo, Y.Usuki, A.Yoshikawa
  • Journal Title: IEEE NSS MIC 2009, Conference Record (In press, 未定)
  • Peer Reviewed
• [Journal Article] Pr:Lu3Al5O12(LuAG)Scintillator Read-Out Using UV-Enhanced Avalanche Photodiode (2010)
  • Author(s): K.Kamada, T.Yanagida, J.Kataoka, A.Yoshikawa, H.Takahashi, K.Tsutsumi, T.Endo, Y.Usuki
  • Journal Title: IEEE NSS MIC 2009, Conference Record (In press, 未定)
  • Peer Reviewed
• [Journal Article] Improvement of the scintillation properties of the Pr:LuAG and Ce:LuAG single crystalline scintillator by the control of the defect related luminescence through chemical substitution (2010)
  • Author(s): A.Yoshikawa, H.Ogino, T.Yanagida, Y.Yokota, S.Maeo, M.Nikl
  • Journal Title: Proceedings of the 20th Symposium of Association for Condensed Matter Photophysics, Japan Pages: 305-308
  • Peer Reviewed
• [Journal Article] Light Yield Non-Proportionality and Energy Resolution of Praseodymium Doped LuAG Scintillator (2009)
  • Author(s): Lukasz Swiderski, Marek Moszynski, Antoni Nassalski, Agnieszka Syntfeld-Kazuch, Tomasz Szczesniak, Kei Kamada, Kousuke Tsutsumi, Yoshiyuki Usuki, T.Yanagida, A.Yoshikawa
  • Journal Title: IEEE Trans.Nucl.Sci. 56 Pages: 1-5
  • Peer Reviewed
• [Journal Article] Scintillation Properties of Praseodymium Doped LuAG Scintillator Compared to Cerium Doped LuAG, LSO and LaBr_3 (2009)
  • Author(s): Lukasz Swiderski, Marek Moszynski, Antoni Nassalski, Agnieszka Syntfeld-Kazuch, Tomasz Szczesniak, Kei Kamada, Kousuke Tsutsumi, Yoshiyuki Usuki, T.Yanagida, A.Yoshikawa
  • Journal Title: IEEE Trans.Nucl.Sci. 56 Pages: 2499-2505
  • Peer Reviewed
• [Journal Article] Basic properties of ceramic Pr:LuAG scintillator (2009)
  • Author(s): Takayuki Yanagida, Akira Yoshikawa, Akio Ikesue, Kei Kamada, Yuui Yokota
  • Journal Title: IEEE Trans.Nucl.Sci. 56 Pages: 2955-2959
  • Peer Reviewed
• [Journal Article] Energy Transfer to Pr^<3+> Ions in Pr : Lu_3Al_5O_<12> (LuAG) Single Crystals (2008)
  • Author(s): A. Yoshikawa, et.al.
  • Journal Title: IEEE. Nucl. Trans. Sci 55(3) Pages: 1372-1375
  • Peer Reviewed
• [Journal Article] Suppression of Host Luminescence in the Pr : LuAG Scintillator (2008)
  • Author(s): H. Ogino, et.al.
  • Journal Title: IEEE. Nucl. Trans. Sci 55(3) Pages: 1197-1200
  • Peer Reviewed
• [Journal Article] Scintillation properties of praseodymium activated Lu_3Al_5O_<12> single crystals (2008)
  • Author(s): W. Drozdowski, et.al.
  • Journal Title: IEEE. Nucl. Trans. Sci 55(4) Pages: 2420-2424
  • Peer Reviewed
• [Presentation] Pr:LuAGを用いた陽電子乳がん検診装置の開発およびPET-MRIへの応用展開 (2009)
  • Author(s): 柳田健之, 吉川彰, 横田有為, 前尾修司, 鎌田圭, 薄善行, 山本誠一, 三宅正泰, 馬場護, 熊谷和明, 佐々木雄久, 伊藤正敏, タルジャーノ・ロド リゲス・サントス, 武田元治, 大内憲明, 荻野拓, 藤本裕, 阿部直人, 古谷優貴, 田中秀彦, 深堀明博
  • Organizer: 第39会結晶成長国内会議
  • Place of Presentation: 愛知,名古屋大学
  • Year and Date: 2009-11-12
• [Presentation] Evaluation of optical properties and gamma-ray responses of Pr:LuAG scintillator for different Pr concentrations (2009)
  • Author(s): T.Yanagida, M.Sato, K.Kamada, Y.Fujimoto, Y.Yokota, A.Yoshikawa
  • Organizer: 5Th ISLNOM
  • Place of Presentation: Pisa, Italy
  • Year and Date: 2009-09-03
• [Presentation] Pr : LuAGシンチレータ結晶と応用 (2008)
  • Author(s): 吉川彰
  • Organizer: 次世代PET研究会
  • Place of Presentation: 放射線医学総合研究所、千葉
  • Year and Date: 2008-07-28
• [Presentation] Growth and optical properties of Lu_3(Ga, Al)_5O_<12> single crystals for scintillator application (2008)
  • Author(s): H. Ogino, et.al.
  • Organizer: The 4th Asian Conference on Crystal Growth and Crystal Technology (CGCT-4)
  • Place of Presentation: Tohoku University, Sendai, Japan
• [Presentation] Detection of scintillation light from Pr : Lu_3Al_5O_<12>(LuAG) by gallium nitride photodiode (2008)
  • Author(s): K. Kamada, et.al.
  • Organizer: 5th International Conference on New Developments In Photodetection 2008
  • Place of Presentation: Palais des Congres, Aix-les-Bains, France
• [Presentation] Basic Properties of Ceramic Pr : LuAG Scintillator (2008)
  • Author(s): T. Yanagida, et.al.
  • Organizer: The Institute of Electrical and Electronics Engineers, Inc. (IEEE NSS/MIC)
  • Place of Presentation: Dresden, Germany
• [Presentation] Study on Pr : LuAG scintillator, arraying procedure, assembling with photo detector and 2-dimensional imaging (2008)
  • Author(s): A. Yoshikawa, et.al.
  • Organizer: Japanese-French Joint Workshop, First Workshop Tohoku University- EMAC- INSA Ecole des Mines, Albi & INSA,Toulouse
  • Place of Presentation: Albi, France
• [Presentation] Improvement of Ce doped LuAG scintillator by suppression of defect related luminescence (2008)
  • Author(s): H. Ogino, et.al.
  • Organizer: Japanese-French Joint Workshop, First Workshop Tohoku University- EMAC- INSA Ecole des Mines. Albi & INSA,Toulouse
  • Place of Presentation: Albi, France
• [Presentation] Fundamental Evaluation of Pr^<3+> Activated Lu_3Al_5O_<12> ceramic scintillator (2008)
  • Author(s): T. Yanagida, et.al.
  • Organizer: Japanese-French Joint Workshop, First Workshop Tohoku University- EMAC- INSA Ecole des Mines. Albi & INSA,Toulouse
  • Place of Presentation: Albi, France
• [Presentation] Pr : Lu_3Al_5O_<12>(LuAG)シンチレータの開発と応用展開 (2008)
  • Author(s): 鎌田圭, ら
  • Organizer: 第69回応用物理学関係連合講演会(秋季大会)
  • Place of Presentation: 春日井、中部大学
• [Presentation] ガンマ線検出用透明セラミックスPr : LuAGシンチレータの開発および特性評価 (2008)
  • Author(s): 柳田健之, ら
  • Organizer: 2008年物理学会秋季大会
  • Place of Presentation: 山形、山形大学