新規重元素系シンチレータの開発

• Project/Area Number: 17J09488
• Research Category: Grant-in-Aid for JSPS Fellows
• Allocation Type: Single-year Grants
• Section: 国内
• Research Field: Nuclear engineering
• Research Institution: Nara Institute of Science and Technology
• Principal Investigator: 中内 大介 奈良先端科学技術大学院大学, 物質創成科学研究科, 特別研究員(DC1)
• Project Period (FY): 2017-04-26 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥3,100,000 (Direct Cost: ¥3,100,000); Fiscal Year 2019: ¥1,000,000 (Direct Cost: ¥1,000,000); Fiscal Year 2018: ¥1,000,000 (Direct Cost: ¥1,000,000); Fiscal Year 2017: ¥1,100,000 (Direct Cost: ¥1,100,000)
• Keywords: シンチレータ / 蛍光体 / 放射線計測 / 結晶育成 / 熱蛍光 / 残光 / 放射線 / 結晶成長 / 単結晶

Outline of Annual Research Achievements

ハフニウム酸希土類 (RE2Hf2O7) およびアルカリ土類群 (AEHfO3) について単結晶の合成および評価を行った。まずRE2Hf2O7に着目して様々な発光中心元素の検討を行ったところ、酸化物シンチレータの発光中心として最も一般的なCeを添加したサンプルでは自己吸収により発光強度が低下した。また、TiやZrなどの同族元素置換はホスト由来の内在発光を増加させることが確認でき、Prなどの4f-4f遷移由来発光を利用した場合にも良好な発光特性が得られた。AEHfO3に着目して検討を進めたところ、RE2Hf2O7の場合と異なりCe添加によって発光特性は大きく改善した。Ti添加品もまた良好なシンチレーション特性が得られ、波高分布解析により定量的な値を算出した。本研究では従来のBGO (Bi4Ge3O12) シンチレータよりも短い蛍光寿命、高い密度を有するいくつかの有用な材料の開発に成功したが、残光特性は従来の酸化物と比べると劣るため今後の改善が求められる。

Research Progress Status

令和元年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和元年度が最終年度であるため、記入しない。

Research Products

• [Journal Article] Scintillation and thermally-stimulated luminescence properties of Tm-doped CaHfO3 crystals (2020)
  • Author(s): Fukushima Hiroyuki、Nakauchi Daisuke、Kato Takumi、Kawaguchi Noriaki、Yanagida Takayuki
  • Journal Title: Radiation Measurements Volume: 133 Pages: 106280-106280
  • DOI: 10.1016/j.radmeas.2020.106280
  • Peer Reviewed
• [Journal Article] Photoluminescence and Scintillation Properties of Ce-doped SrHfO3 (2019)
  • Author(s): Fukushima Hiroyuki、Nakauchi Daisuke、Kawaguchi Noriaki、Yanagida Takayuki
  • Journal Title: Sensors and Materials Volume: 31 Issue: 4 Pages: 1273
  • DOI: 10.18494/SAM.2019.2187
  • ISSN: 0914-4935, 2435-0869
  • Year and Date: 2019-04-22
  • Peer Reviewed
• [Journal Article] Photoluminescence and scintillation properties of Ti-doped CaHfO3 crystals (2019)
  • Author(s): Fukushima Hiroyuki、Nakauchi Daisuke、Kawaguchi Noriaki、Yanagida Takayuki
  • Journal Title: Japanese Journal of Applied Physics Volume: 58 Issue: 5 Pages: 052005-052005
  • DOI: 10.7567/1347-4065/ab116c
  • Peer Reviewed
• [Journal Article] Scintillation and Photoluminescence Properties of Pr-Doped CaHfO3 Crystals (2019)
  • Author(s): Fukushima Hiroyuki、Nakauchi Daisuke、Kawaguchi Noriaki、Yanagida Takayuki
  • Journal Title: J. Ceram. Process. Res. Volume: 20 Pages: 211-215
  • Peer Reviewed
• [Journal Article] Photo-, radio- and thermo- luminescence properties of Eu-doped BaSi2O5 glass-ceramics (2019)
  • Author(s): Nakauchi Daisuke、Shinozaki Kenji、Kawaguchi Noriaki、Yanagida Takayuki
  • Journal Title: Optik Volume: 185 Pages: 812-818
  • DOI: 10.1016/j.ijleo.2019.03.130
  • Peer Reviewed
• [Journal Article] Scintillation properties of Ti- and Zr-doped lanthanum hafnate single crystals (2019)
  • Author(s): Nakauchi Daisuke、Kawaguchi Noriaki、Yanagida Takayuki
  • Journal Title: Optical Materials Volume: 90 Pages: 227-230
  • DOI: 10.1016/j.optmat.2019.02.050
  • Peer Reviewed
• [Journal Article] Optical and radiation-induced luminescence properties of Sn-doped magnesium aluminoborate glasses (2019)
  • Author(s): Nakauchi Daisuke、Okada Go、Fujimoto Yutaka、Kawano Naoki、Kawaguchi Noriaki、Yanagida Takayuki
  • Journal Title: Physics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B Volume: 60 Issue: 1 Pages: 10-14
  • DOI: 10.13036/17533562.60.1.029
  • Peer Reviewed
• [Journal Article] Synthesis and scintillation properties of Ce-doped CaHfO3 crystals (2018)
  • Author(s): H. Fukushima, D. Nakauchi, G. Okada, N. Kawaguchi, T. Yanagida
  • Journal Title: ,Journal of Materials Science: Materials in Electronics Volume: 29 Issue: 24 Pages: 21033-21039
  • DOI: 10.1007/s10854-018-0249-9
  • Peer Reviewed
• [Journal Article] Scintillation properties of RE2Hf2O7 (RE=La, Gd, Lu) single crystals prepared by Xenon arc floating zone furnace (2018)
  • Author(s): D. Nakauchi, G. Okada, N. Kawaguchi, T. Yanagida
  • Journal Title: Jpn. J. Appl. Phys. Volume: 57 Issue: 10 Pages: 100307-100307
  • DOI: 10.7567/jjap.57.100307
  • NAID: 210000149695
  • Peer Reviewed
• [Presentation] ハフニウム酸希土類単結晶シンチレータの開発 (2018)
  • Author(s): 中内大介, 岡田豪, 河口範明, 柳田健之
  • Organizer: 第65回応用物理学会春季学術講演会
• [Presentation] Luminescent and Scintillation Properties of Ce-doped Tb3GaxAl5-xO12 Single Crystals (2017)
  • Author(s): D. Nakauchi, G. Okada, N. Kawaguchi, T. Yanagida
  • Organizer: EM-NANO
  • Int'l Joint Research
• [Presentation] Radiation induced luminescence properties of Eu-doped SrO-Al2O3 single crystals (2017)
  • Author(s): D. Nakauchi, G. Okada, M. Koshimizu, N. Kawaguchi, T. Yanagida
  • Organizer: The 19th International Conference on Radiation Effects in Insulators
  • Int'l Joint Research
• [Presentation] Optical and radiation-induced luminescence properties of Sn-doped magnesium aluminoborate glasses (2017)
  • Author(s): D. Nakauchi, Y. Fujimoto, G. Okada, N. Kawaguchi, T. Yanagida
  • Organizer: The 9th International Conference on Borate Glasses, Crystals and Melts
  • Int'l Joint Research
• [Presentation] Photo-, Radio- and Thermoluminescence Characterizations in Rare-Earth-Doped SrAl2O4 Crystals (2017)
  • Author(s): D. Nakauchi, G. Okada, M. Koshimizu, N. Kawano, N. Kawaguchi, T. Yanagida
  • Organizer: STAC-10
  • Int'l Joint Research
• [Presentation] Radiation-induced luminescence properties of Pr:CaSiO3 crystals (2017)
  • Author(s): D. Nakauchi, G. Okada, M. Koshimizu, N. Kawano, N. Kawaguchi, T. Yanagida
  • Organizer: IEEE NSS MIC 2017
  • Int'l Joint Research
• [Presentation] Luminescent and scintillation properties of Al-rich Ce:Tb3Al5O12 crystals (2017)
  • Author(s): D. Nakauchii, G. Okada, N. Kawano, N. Kawaguchi, T. Yanagida
  • Organizer: IEEE NSS MIC 2017
  • Int'l Joint Research
• [Presentation] Scintillation and dosimetric properties in Eu:(Ba,Sr)Al2O4 crystals (2017)
  • Author(s): D. Nakauchii, G. Okada, N. Kawano, N. Kawaguchi, T. Yanagida
  • Organizer: IEEE NSS MIC 2017
  • Int'l Joint Research
• [Presentation] Effects of Ba-substitution on Eu-doped SrAl2O4 bulk crystalline scintillators (2017)
  • Author(s): D. Nakauchi, G. Okada, N. Kawano, N. Kawaguchi, T. Yanagida
  • Organizer: PRE2017
  • Int'l Joint Research
• [Presentation] Luminescent and scintillation properties of Eu-doped Ba2SiO4 (2017)
  • Author(s): D. Nakauchi, G. Okada, N. Kawano, N. Kawaguchi, T. Yanagida
  • Organizer: PRE2017
  • Int'l Joint Research
• [Remarks] PROFILE
  • URL: http://mswebs.naist.jp/LABs/yanagida/nakauchi/profile.html