Material Survey of Novel Red-hot Scintillators

2019 Fiscal Year Annual Research Report

• Project/Area Number: 19H02422
• Research Institution: Tohoku University
• Principal Investigator: 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)
• Co-Investigator(Kenkyū-buntansha): 北浦 守 山形大学, 理学部, 教授 (60300571)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: シンチレータ / 赤色発光

Outline of Annual Research Achievements

放射線の入射によって発光する、高機能発光材料であるシンチレータについて、いままでの発光領域とは異なる赤色～近赤外線で発光する新しいシンチレータの開発を行った。具体的には、塩化物、臭化物といったハロゲン化物、および、酸化物を中心に、発光波長600 nm～1100nm程度の赤色～近赤外線のシンチレータをブリッジマン法やマイクロ引き下げ法などを利用して育成を行った。
育成後には、結晶が正しく育成されているか、結晶構造や組成の分析を行った。さらに研磨などの加工を行った後に、目的の発光波長（600 nm～1100nm程度）に合致するか確認した。さらに、1ガンマ線光子入射で変換されるシンチレータ光子数（発光量）をシングルフォトンカウンティング法で確認したところ、ヨウ化物で発光波長700nm、発光量50,000光子/MeV以上と目標値の新しい材料を見つけることができた。
開発したシンチレータについては、新しい材料であるため、その結晶構造の解明も進めて、発光のメカニズムと結晶構造の関連性について、調査を進めた。たとえば、ある結晶については、Hfなどの金属元素の周りをヨウ素が6個配置した八面体構造をとることが分かっており、この八面体構造が赤色の発光を発現させることが示唆されている。
赤色発光シンチレータの利点として、チェレンコフ発光などの青色発光との切り分けができるため、チェレンコフ発光などの青色発光がノイズとなるような放射線計測の現場で利用する点がある。そこで、このような応用、特に線量の高い領域での測定など、新しい検出器への搭載に向けた、結晶の加工などについても研究を進めることができた。

Current Status of Research Progress

1: Research has progressed more than it was originally planned.

Reason

当初計画を前倒して、当該年度中・期間中に、目標の発光波長と発光量を持ち、かつ、蛍光寿命も早い理想的なシンチレータを見つけることができたため。

Strategy for Future Research Activity

引き続き、組成の設計計画に基づき、さらに適切な発光波長の中で、より高い発光量を示す新規シンチレータの開発を行う。さらに、見つけた新規材料について、発光の起源がまだ特定されていないことから、材料設計指針の精度をさらに高める目的も含めて、その特定を進める。そのために、発光強度の温度依存性などを１０ケルビン程度の低温から常温・高温まで測定し、そのふるまいから発光起源について議論する。

Research Products

• [Int'l Joint Research] チェコ科学アカデミー(チェコ)
  • Country Name: CZECH
  • Counterpart Institution: チェコ科学アカデミー
• [Int'l Joint Research] カジミエシュヴィエルキ大学ビドゴシチ(ポーランド)
  • Country Name: POLAND
  • Counterpart Institution: カジミエシュヴィエルキ大学ビドゴシチ
• [Journal Article] Luminescence properties of scintillators in soft X-ray region (2020)
  • Author(s): Ejima Takeo、Kurosawa Shunsuke、Yamaji Akihiro、Hatano Tadashi、Wakayama Toshitaka、Higashiguchi Takeshi、Kitaura Mamoru
  • Journal Title: Journal of Luminescence Volume: 219 Pages: 116850～116850
  • DOI: 10.1016/j.jlumin.2019.116850
  • Peer Reviewed
• [Journal Article] Phase diagram of BaI2-LuI3 system and growth of BaI2/LuI3 eutectic scintillator (2020)
  • Author(s): Origuchi Kazuya、Yokota Yuui、Kral Robert、Yoshino Masao、Yamaji Akihiro、Toyoda Satoshi、Sato Hiroki、Ohashi Yuji、Kurosawa Shunsuke、Kamada Kei、Yoshikawa Akira
  • Journal Title: Journal of Crystal Growth Volume: 536 Pages: 125573～125573
  • DOI: 10.1016/j.jcrysgro.2020.125573
  • Peer Reviewed
• [Journal Article] Growth and Scintillation Properties of a New Red-Emitting Scintillator Rb2HfI6 for the Fiber-Reading Radiation Monitor (2020)
  • Author(s): Kodama Shohei、Kurosawa Shunsuke、Morishita Yuki、Usami Hiroshi、Torii Tatsuo、Hayashi Masateru、Sasano Makoto、Azuma Tetsushi、Tanaka Hiroki、Kochurikhin Vladimir、Pejchal Jan、Kral Robert、Yoshino Masao、Yamaji Akihiro、Toyoda Satoshi、Sato Hiroki、Ohashi Yuji、Yokota Yuui、Kamada Kei、Nikl Martin、Yoshikawa Akira
  • Journal Title: IEEE Transactions on Nuclear Science Volume: 67 Pages: 1055～1062
  • DOI: 10.1109/TNS.2020.2976695
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Fiber-read radiation monitoring system using an optical fiber and red-emitting scintillator for ultra-high-dose conditions (2020)
  • Author(s): Kodama Shohei、Kurosawa Shunsuke、Ohno Maki、Morishita Yuki、Usami Hiroshi、Hayashi Masateru、Sasano Makoto、Azuma Tetsushi、Tanaka Hiroki、Kochurikhin Vladimir、Yamaji Akihiro、Yoshino Masao、Toyoda Satoshi、Sato Hiroki、Ohashi Yuji、Kamada Kei、Yokota Yuui、Yoshikawa Akira、Torii Tatsuo
  • Journal Title: Applied Physics Express Volume: 13 Pages: 047002～047002
  • DOI: 10.35848/1882-0786/ab77f7
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Scintillation Characteristics of Mg2+-Codoped Y0.8Gd2.2(Al5-xGax)O12:Ce Single Crystals (2020)
  • Author(s): Chewpraditkul Weerapong、Pattanaboonmee Nakarin、Chewpraditkul Warut、Sakthong Ongsa、Yamaji Akihiro、Kamada Kei、Kurosawa Shunsuke、Yoshikawa Akira、Drozdowski Winicjusz、Witkowski Marcin E.、Szczesniak Tomasz、Grodzicka Martyna、Moszynski Marek
  • Journal Title: IEEE Transactions on Nuclear Science Volume: 67 Pages: 910～914
  • DOI: 10.1109/TNS.2020.2975734
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Development of a novel red-emitting cesium hafnium iodide scintillator (2019)
  • Author(s): Kodama Shohei、Kurosawa Shunsuke、Ohno Maki、Yamaji Akihiro、Yoshino Masao、Pejchal Jan、Kral Robert、Ohashi Yuji、Kamada Kei、Yokota Yuui、Nikl Martin、Yoshikawa Akira
  • Journal Title: Radiation Measurements Volume: 124 Pages: 54～58
  • DOI: 10.1016/j.radmeas.2019.03.005
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Crystal growth and luminescence properties of organic crystal scintillators for α-rays detection (2019)
  • Author(s): Yamato Shinnosuke、Yamaji Akihiro、Kurosawa Shunsuke、Yoshino Masao、Ohashi Yuji、Kamada Kei、Yokota Yuui、Yoshikawa Akira
  • Journal Title: Optical Materials Volume: 94 Pages: 58～63
  • DOI: 10.1016/j.optmat.2019.04.051
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Scintillation properties of Y-Admixed Gd2Si2O7 scintillator (2019)
  • Author(s): Kurosawa S.、Shishido T.、Sugawara T.、Yubuta K.、Horiai T.、Jary V.、Yamaji A.、Yoshino M.、Yokota Y.、Shoji Y.、Kamada K.、Yoshikawa A.、Pejchal J.、Nikl M.
  • Journal Title: Radiation Measurements Volume: 126 Pages: 106123～106123
  • DOI: 10.1016/j.radmeas.2019.106123
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Ga for Al substitution effects on the garnet phase stability and luminescence properties of Gd3GaxAl5-xO12:Ce single crystals (2019)
  • Author(s): Bartosiewicz K.、Babin V.、Kamada K.、Yoshikawa A.、Kurosawa S.、Beitlerova A.、Kucerkova R.、Nikl M.、Zorenko Yu
  • Journal Title: Journal of Luminescence Volume: 216 Pages: 116724～116724
  • DOI: 10.1016/j.jlumin.2019.116724
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Development of the new radiation monitor system using a novel scintillator (2019)
  • Author(s): Shunsuke Kurosawa, Shohei Kodama, Takahiko Horiai, Akihiro Yamaji, Rikito Murakami, Yasuhiro Shoji, Masao Yoshino, Yuji Ohashi, Kei Kamada, Yuui Yokota, Akira Yoshikawa
  • Organizer: International Topical Workshop on Fukushima Decommissioning Research (FDR2019)
  • Int'l Joint Research
• [Presentation] Development of Novel Red/Near-Infrared Scintillation Materials with Fast Decay Time (2019)
  • Author(s): Shunsuke Kurosawa
  • Organizer: 8th International Symposium on Optical Materials (IS-OM 8)
  • Int'l Joint Research / Invited
• [Presentation] Crystal growth and optical properties of a Ce2Si2O7 single crystal (2019)
  • Author(s): Takahiro Horiai, Shunsuke Kurosawa, Rikito Murakami, Yasuhiro Shoji, Jan Pejchal, Masao Yoshino, Akihiro Yamaji, Hiroki Sato, Yuji Ohashi, Kei Kamada, Yuui Yokota, Akira Yoshikawa
  • Organizer: 19th International Conference on Crystal Growth and Epitaxy (ICCGE-29)
  • Int'l Joint Research
• [Presentation] Optical Study on Garnet-Type Scintillator with Longer-Wave-Emitting (2019)
  • Author(s): Shunsuke KUROSAWA, Akihiro YAMAJI, Shohei KODAMA, Shinnosuke YAMATO, Yutaro KURASHIMA, Kei KAMADA, Masao YOSHINO, Satoshi TOYODA, Hiroki SATO, Yuui YOKOTA, Yuji Ohashi, Akira YOSHIKAWA
  • Organizer: 8th International Workshop on Photoluminescence in Rare Earths: Photonic Materials and Devices (PRE'19)
  • Int'l Joint Research
• [Presentation] Development of Cr-Doped Oxide Crystals as Red and Near Infra-Red Emission for Medical Use (2019)
  • Author(s): S. Kurosawa, T. Shishido, T. Sugawara, A. Nomura, K. Yubuta, A. Yamaji, M.Yoshino, S. Toyoda, H. Sato, Y. Ohashi, K. Kamada, Y. Yokota, A. Yoshikawa
  • Organizer: International Conference on Excited States of Transitions Elements
  • Int'l Joint Research
• [Presentation] Self-Trapped Exciton Luminescence of Anion-Substituted Cesium Hafnium Chloride (2019)
  • Author(s): S. Kodama, S. Kurosawa, M. Ohno, A. Yamaji, M. Yoshino, S. Toyoda, H. Sato, Y. Ohashi, K. Kamada, Y. Yokota, R. Kral, J. Pejchal, M. Nikl, A. Yoshikawa
  • Organizer: International Conference on Excited States of Transitions Elements
  • Int'l Joint Research
• [Presentation] Development of La-GPS(Ce) Pixel Scintillation Arrays for Real-Time Dose-Verification in Particle Therapy (2019)
  • Author(s): Shunsuke Kurosawa, Yasuhiro Shoji, Shinya Sonoda, Tetsuya Mizumumo, Masao Yoshino, Hayato Numakura, Mitsuru Abe, Atsushi Takada, Akihiro. Yamaji, Yuji Ohashi, Yuui Yokota, Kei Kamada, Akira Yoshikawa, Fuyuki Tokanai, Takeo Iwai, Kenji Nemoto And Toru Tanimori
  • Organizer: 15th International conference on Scintillating Materials and their Applications (SCINT2019)
  • Int'l Joint Research
• [Presentation] Development of the Fiber-reading Scintillation Detector under Ultra-high Dose Rate (2019)
  • Author(s): Shohei Kodama, Shunsuke Kurosawa, Maki Ohno, Ai Makabe, Yuki Morishita, Hiroshi Usami, Masateru Hayashi, Hiroki Tanaka, Vladimir Kochurikhin, Akihiro Yamaji, Masao Yoshino, Hiroki Sato, Yuji Ohashi, Kei Kamada, Yuui Yokota, Akira Yoshikawa
  • Organizer: 15th International conference on Scintillating Materials and their Applications (SCINT2019)
  • Int'l Joint Research
• [Presentation] Synthesis and optical properties of red-emitting A2MI6 scintillators (A = K, Rb and Cs, M = Zr and Hf) (2019)
  • Author(s): Shohei Kodama, Shunsuke Kurosawa, Maki Ohno, Akihiro Yamaji, Masao Yoshino, Hiroki Sato, Yuji Ohashi, Kei Kamada, Yuui Yokota, Akira Yoshikawa
  • Organizer: The 13th Pacific Rim Conference of Ceramic Societies (PACRIM13)
  • Int'l Joint Research
• [Presentation] Novel material-search method for transparent optical materials with high melting point using electric arc (2019)
  • Author(s): Yutaro.Kurashima, Shunsuke Kurosawa, Rikito Murakami, Akihiro Yamaji, Kei Kamada, Masao Yoshino, Satoshi Toyoda, Hiroki Sato, Yuui Yokota, Yuji Ohashi, Akira Yoshikawa
  • Organizer: The 13th Pacific Rim Conference of Ceramic Societies (PACRIM13)
  • Int'l Joint Research
• [Presentation] Study on Red-Emission Scintillation Materials ~Crystals & powders~ (2019)
  • Author(s): Shunsuke Kurosawa, Yutaro Kurashima, Akihiro Yamaji, Shohei Kodama, Masao Yoshino, Satoshi Toyoda, Hiroki Sato, Yuui Yokota, Kei Kamada, Yuji Ohashi, Akira Yoshikawa
  • Organizer: The 13th Pacific Rim Conference of Ceramic Societies (PACRIM13)
  • Int'l Joint Research / Invited
• [Presentation] Direction-Sensitive Dark Matter Search using Zinc Tungstate Scintillators (2019)
  • Author(s): S. Kurosawa, H. Sekiya, A. Yamaji, M. Abe, M. Tsukahara, T. Horiai, R. Murakami, Y. Shoji, M. Yoshino, H. Sato, Y. Ohashi, Y. Yokota, K. Kamada, A. Yoshikawa
  • Organizer: 2019 IEEE Nuclear Science Symposium and Medical Imaging Conference
  • Int'l Joint Research
• [Presentation] Growth of Ce-doped (Gd,La)2 Si2O7 Single Crystals and their applications (2019)
  • Author(s): Y. Shoji, S. Kurosawa, V. Kochurikhin, K. Kamada, S. Hayasaka, M. Yoshino, Y. Yokota, Y. Ohashi, A. Yamaji, A. Yoshikawa
  • Organizer: 2019 IEEE Nuclear Science Symposium and Medical Imaging Conference
  • Int'l Joint Research
• [Presentation] Development of an Electron-Tracking Compton Camera and Novel Scintillator for In-Beam Dose-Verification in Particle Therapy (2019)
  • Author(s): S. Kurosawa, S. Sonoda, T. Mizumoto, H. Numakura, M. Yoshino, S. Komura, H. Abe, A. Takada, A. Yamaji, Y. Ohashi, H. Sato, K. Kamada, Y. Yokota, A. Yoshikawa, F. Tokanai, T. Iwai, K. Nemoto, T. Tanimori
  • Organizer: 2019 IEEE Nuclear Science Symposium and Medical Imaging Conference
  • Int'l Joint Research
• [Presentation] Real-Time Dose-Verification in Particle Therapy Using an Electron-Tracking Compton Camera and their simulation study (2019)
  • Author(s): Shunsuke Kurosawa, Yasuhiro Shoji, Shinya Sonoda, Tetsuya Mizumoto, Masao Yoshino, Hayato Numakura, Shotaro Komura, Mitsuru Abe, Atsushi Takada, Akihiro Yamaji, Yuji Ohashi, Yuui Yokota, Kei Kamada, Akira Yoshikawa, Fuyuki Tokanai, Takeo Iwai, Kenji Nemoto and Toru Tanimori
  • Organizer: the 1st Annual Conference of the Particle Therapy Co-operative Group Asia-Oceania (PTCOG-AO’19)
  • Int'l Joint Research
• [Presentation] Fabrication of novel transparent ceramics for scintillation materials (2019)
  • Author(s): 黒澤俊介、藤原加奈
  • Organizer: 光・量子ビーム科学合同シンポジウム2019-平成30年度共同研究成果報告会-
• [Presentation] 粒子線治療におけるリアルタイム線量撮像機器の開発と現状 (2019)
  • Author(s): 黒澤 俊介
  • Organizer: 第72回放射線計測研究会
  • Invited
• [Presentation] 高融点透明光学材料を得るためのアークを用いた新たな材料探索法 (2019)
  • Author(s): 倉嶋 佑太朗、黒澤 俊介、村上 力輝斗、山路 晃広、鎌田 圭、吉野 将生、豊田 智史、佐藤 浩樹、横田 有為、大橋 雄二、吉川 彰
  • Organizer: 第80回応用物理学会秋期学術講演会
• [Presentation] 粒子線治療への応用に向けた電子飛跡型コンプトンカメラの開発V (2019)
  • Author(s): 黒澤 俊介、沼倉 隼人、園田 真也、水本 哲矢、谷森 達、高田 淳史、吉野 将生、山路 晃広、大橋 雄二、鎌田 圭、横田 有為、吉川 彰、門叶 冬樹、岩井 岳夫、根本 健二、豊田 智史
  • Organizer: 第80回応用物理学会秋期学術講演会
• [Presentation] 結晶と物理学 (2019)
  • Author(s): 黒澤俊介
  • Organizer: 異分野基礎科学研究所 量子宇宙研コア セミナー
  • Invited
• [Presentation] シンチレータの開発の現状-2019年度- (2019)
  • Author(s): 黒澤俊介、山路晃広、堀合毅彦、小玉翔平、大和慎之介、倉嶋佑太朗、村上力輝斗、鎌田圭、吉野将生、豊田智史、佐藤浩樹、横田有為、大橋雄二、吉川彰
  • Organizer: 研究会「放射線検出器とその応用」（第34回）
• [Remarks]
  • URL: http://yoshikawa-lab.imr.tohoku.ac.jp/personal/kurosawa/index.html