Study on environmental behavior of mobile fraction of fallout radionuclides by nuclear power plant accident

• Project/Area Number: 25289355
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Nuclear engineering
• Research Institution: Tokyo Institute of Technology (2016); Japan Atomic Energy Agency (2013-2015)
• Principal Investigator: Ohnuki Toshihiko 東京工業大学, 科学技術創成研究院, 教授 (20354904)
• Co-Investigator(Kenkyū-buntansha): 宇都宮 聡 九州大学, 理学(系)研究科(研究院), 准教授 (40452792) ; 田中 万也 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 先端基礎研究センター, 研究員 (60377992) ; 坂本 文徳 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 先端基礎研究センター, 研究員 (60391273) ; 難波 謙二 福島大学, 共生システム理工学類, 教授 (70242162) ; 香西 直文 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 先端基礎研究センター, 研究員 (80354877) ; 山崎 信哉 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 先端基礎研究センター, 博士研究員 (70610301) ; 鈴木 義規 東京工科大学, 応用生物学部, 助教 (20455281)
• Project Period (FY): 2013-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000); Fiscal Year 2016: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000); Fiscal Year 2015: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000); Fiscal Year 2014: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000); Fiscal Year 2013: ¥10,270,000 (Direct Cost: ¥7,900,000、Indirect Cost: ¥2,370,000)
• Keywords: 放射性Cs / 濃集 / きのこ / 移行経路 / 易動性 / 放射性セシウム / 糸状菌 / 濃集機構 / 原子力エネルギー / 森林リター / 移行挙動 / 移行 / 福島第一発電所

Outline of Final Research Achievements

Environmental behavior of mobile radionuclides have studied by sorption experiments of radiocesium in fallen leaves and wood by microorganisms and by dissolution experiments during growth of microorganisms in nutrient solution. The results showed that new pathway of radiocesium from fallen wood to fruiting bodies via outside of hypha and that radiocesium dissolved in the nutrient solution during growth of microorganisms is more mobile though soil column than cationic form of radiocesium.

Research Products

• [Journal Article] Direct accumulation pathway of radioactive cesium to fruitbodies (2016)
  • Author(s): Toshihiko Ohnuki1, Yukitoshi Aiba, Fuminori Sakamoto, Naofumi Kozai, Tadafumi Niizato, Yoshito Sasaki
  • Journal Title: Scientific Reports Volume: 6 Issue: 1 Pages: 29866-29866
  • DOI: 10.1038/srep29866
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Adsorption behavior of radioactive cesium by non-mica minerals (2013)
  • Author(s): T. Ohnuki, N. Kozai
  • Journal Title: J. Nuclear Science & Technology Volume: 50 Issue: 4 Pages: 369-375
  • DOI: 10.1080/00223131.2013.773164
  • Peer Reviewed
• [Presentation] Accumulation of radioactive cesium in edible mushroom (2015)
  • Author(s): T. Ohnuki, F. Sakamoto, N. Kozai, S. Yamasaki, Q. Yu
  • Organizer: the 2015 International Chemical Congress of the Pacific Basin Societies
  • Place of Presentation: Honolulu, USA
  • Year and Date: 2015-12-15
  • Int'l Joint Research / Invited
• [Presentation] 放射性Csの移行への糸状菌の影響－鉱物の影響－ (2014)
  • Author(s): 大貫敏彦、坂本文徳、香西直文、椎名和弘、田中健之、行川淳
  • Organizer: 2014年度地球化学会年会
  • Place of Presentation: 富山県富山市富山大学
  • Year and Date: 2014-09-16 – 2014-09-18
• [Presentation] Accumulation of radiocesium in filamentous fungi (2014)
  • Author(s): TOSHIHIKO OHNUKI, FUMINORI SAKAMOTO, NAOFUMI KOZAKI, SHINYA YAMASAKI, QIANQIAN YU
  • Organizer: Goldschmidt conference 2014
  • Place of Presentation: Sacramento, CA, USA
  • Year and Date: 2014-06-08 – 2014-06-13
• [Presentation] Migration Behavior of Radiocesium Released from Fukushima Daiichi Nuclear Power Plant Accident (2013)
  • Author(s): Toshihiko Ohnuki, Naofumi Kozai, Fuminori Sakamoto
  • Organizer: 5th Asia-Pacific Symposium on Radiochemistry
  • Place of Presentation: Kanazawa, Japan