Developement of high-melting-point organic crystals for neutron scintillators

• Project/Area Number: 18K14135
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 30010:Crystal engineering-related
• Research Institution: Tohoku University
• Principal Investigator: Yamaji Akihiro 東北大学, 金属材料研究所, 助教 (20779722)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Discontinued (Fiscal Year 2020)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
• Keywords: 有機結晶 / 結晶成長 / シンチレータ / 中性子検出 / 中性子

Outline of Final Research Achievements

Organic crystals have been grown and developed for neutron scintillator. In this study, we have grown organic crystals with crystal structure of benzene rings and evaluated their scintillation properties. We have developed organic crystals for neutron scintillators with high melting temperatures higher than 200°C and fast decay times.Large size crystals with a diameter of up to 2inch for detector applications have been grown and neutron imaging test was performed by using the grown crystlas.

Academic Significance and Societal Importance of the Research Achievements

中性子で発光するシンチレータとして有機物結晶の育成を行い、系統的に探索することで、有機物結晶の結晶構造と発光特性の関連性を明らかにする。これにより、材料設計の指針が構築できると予想されている。有望な材料が見つかれば、セキュリティ（爆発物検査等）や資源探査、高エネルギー物理など幅広い分野への寄与が期待できる。

Research Products

• [Journal Article] Crystal growth and scintillation properties of carbazole for neutron detection (2020)
  • Author(s): Akihiro Yamaji, Shinnosuke Yamato, Shunsuke Kurosawa, Masao Yoshino, Satoshi Toyoda, Kei Kamada, Yuui Yokota, Hiroki Sato, Yuji Ohashi and Akira Yoshikawa
  • Journal Title: IEEE Transactions on Nuclear Science Volume: - Issue: 6 Pages: 1027-1031
  • DOI: 10.1109/tns.2020.2996276
  • Peer Reviewed
• [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
• [Presentation] Growth of heterocyclic compounds crystal and its scintillation property for neutron detection (2019)
  • Author(s): Akihiro Yamaji, Shinnosuke Yamato, Shunsuke Kurosawa, Masao Yoshino, Kei Kamada,, Yuui Yokota, Hiroki Sato,, Yuji Ohashi, Akira Yoshikawa
  • Organizer: 15th International conference on Scintillating Materials and their Applications (SCINT2019)
  • Int'l Joint Research
• [Presentation] 中性子検出用途の有機結晶育成とシンチレーション特性評価 (2019)
  • Author(s): 山路 晃広、大和 慎之介、黒澤 俊介、吉野 将生、豊田 智史、佐藤 浩樹、大橋 雄二、横田 有為、鎌田 圭、吉川 彰
  • Organizer: 第80回応用物理学会秋期学術講演会
• [Presentation] p-terphenyl結晶の作製とシンチレーション特性評価 (2019)
  • Author(s): 山路 晃広, 大和 慎之介, 黒澤 俊介, 吉野 将生, 大橋 雄二, 横田 有為, 鎌田 圭, 吉川 彰
  • Organizer: 第66回応用物理学会春季学術講演会
• [Presentation] 高計数率α線検出を可能にする高融点有機結晶シンチレータの開発 (2018)
  • Author(s): 大和慎之介、山路晃広、黒澤俊介、吉野将生、大橋雄二、横田有為、鎌田圭、吉川彰
  • Organizer: セラミックス協会第31回秋季シンポジウム
• [Presentation] p-terphenyl結晶の大口径化と評価 (2018)
  • Author(s): 山路 晃広、大和 慎之介、黒澤 俊介、吉野 将生、大橋 雄二、横田 有為、鎌田 圭、吉川 彰
  • Organizer: 第79回応用物理学会 秋季学術講演会
• [Presentation] Scintillation and optical properties of organic crystal scintillators with a high melting point for α-particles detection (2018)
  • Author(s): Shinnosuke Yamato, Akihiro Yamaji, Shunsuke Kurosawa, Masao Yoshino, Yuji Ohahshi, Yuui Yokota, Kei Kamada, Akira Yoshikawa
  • Organizer: The 5th International Conference on the Physics of Optical Materials and Devices (ICOM2018)
  • Int'l Joint Research
• [Remarks] 東北大学金属材料研究所 吉川研究室
  • URL: http://yoshikawa-lab.imr.tohoku.ac.jp/