Formation mechanism of strontium bearing glassy microparticles

• Project/Area Number: 18K14161
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 31010:Nuclear engineering-related
• Research Institution: Japan Atomic Energy Agency
• Principal Investigator: Hagiwara Hiroki 国立研究開発法人日本原子力研究開発機構, 福島研究開発部門 福島研究開発拠点 廃炉環境国際共同研究センター, 研究副主幹 (20773914)
• Project Period (FY): 2018-04-01 – 2022-03-31
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2021: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000); Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 福島第一原子力発電所事故 / ガラス質放射性微粒子 / 放射性セシウム / ストロンチウム / 放射性セシウム含有微粒子 / フィルター材 / ガラス質粒子 / Type-A / HEPAフィルター / Type A / マイクロパーティクル / ガラス

Outline of Final Research Achievements

We analyzed chemical composition and radioactivity in radioactive micro glass particles from Fukushima Daiichi nuclear power plant and also conducted in-situ experiment to identify the source and formation mechanism. The results showed that quantity of radioactive strontium-90 in glass particles was small. The Type-A particles were newly classified as two types base on these morphologies and these particles formed by similar processes. We succeed that glass fiber can form micro particle similar with Type-A particles due to heating.

Academic Significance and Societal Importance of the Research Achievements

ガラス質放射性微粒子の起源を特定することは、環境中に飛散したガラス質放射性微粒子の放出量の定量化、事故当時の炉内事象の解明および廃炉作業に係る内部被ばく評価を行う上で重要である。本研究において、環境中から採取したガラス質放射性微粒子の特徴を把握し、起源物質として考えられる炉内構造物と比較することで、その起源を特定できる可能性が示唆された。

Research Products

• [Journal Article] The formation mechanism of radiocesium-bearing microparticles derived from the Fukushima Daiichi nuclear power plant using electron microscopy (2022)
  • Author(s): Hiroki Hagiwara, Keietsu Kondo, Akihide Hidaka
  • Journal Title: Journal of Radioanalytical and Nuclear Chemistry Volume: 331 Issue: 12 Pages: 5905-5914
  • DOI: 10.1007/s10967-022-08434-7
  • Peer Reviewed
• [Journal Article] Testing mosses exposed in bags as biointerceptors of airborne radiocaesium after the Fukushima Dai-ichi Nuclear Power Station accident (2022)
  • Author(s): Anna Di Palma, Paola Adamo, Terumi Dohi, Kenso Fujiwara, Hiroki Hagiwara, Akihiro Kitamura, Akihiro Sakoda, Kazuhiko Sato, Kazuki Iijima
  • Journal Title: Chemosphere Volume: 308 Pages: 136179-136179
  • DOI: 10.1016/j.chemosphere.2022.136179
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Radiocesium-bearing microparticles cause a large variation in 137Cs activity concentration in the aquatic insect Stenopsyche marmorata (Tricoptera: Stenopsychidae) in the Ota River, Fukushima, Japan (2022)
  • Author(s): Ishii Yumiko、Miura Hikaru、Jo Jaeick、Tsuji Hideki、Saito Rie、Koarai Kazuma、Hagiwara Hiroki、Urushidate Tadayuki、Nishikiori Tatsuhiro、Wada Toshihiro、Hayashi Seiji、Takahashi Yoshio
  • Journal Title: PLOS ONE Volume: 17 Issue: 5 Pages: 1-17
  • DOI: 10.1371/journal.pone.0268629
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Characterization of radiocesium-bearing microparticles with different morphologies in soil around the Fukushima Daiichi nuclear power plant (2021)
  • Author(s): Hagiwara Hiroki、Funaki Hironori、Shiribiki Natsu、Kanno Marina、Sanada Yukihisa
  • Journal Title: Journal of Radioanalytical and Nuclear Chemistry Volume: 331 Issue: 1 Pages: 415-426
  • DOI: 10.1007/s10967-021-08061-8
  • Peer Reviewed
• [Journal Article] Impact of Extreme Typhoon Events on the Fluvial Discharge of Particulate Radiocesium in Fukushima Prefecture (2021)
  • Author(s): Nakanishi Takahiro、Ohyama Takuya、Hagiwara Hiroki、Sakuma Kazuyuki
  • Journal Title: Journal of Coastal Research Volume: 114 Issue: sp1 Pages: 310-314
  • DOI: 10.2112/jcr-si114-063.1
  • Peer Reviewed
• [Journal Article] Radiocesium distribution in the sediments of the Odaka River estuary, Fukushima, Japan (2020)
  • Author(s): Hagiwara Hiroki、Nakanishi Takahiro、Konishi Hiromi、Tsuruta Tadahiko、Misonou Toshiharu、Fujiwara Kenso、Kitamura Akihiro
  • Journal Title: Journal of Environmental Radioactivity Volume: 220-221 Pages: 106294-106294
  • DOI: 10.1016/j.jenvrad.2020.106294
  • Peer Reviewed
• [Journal Article] Mineral composition characteristics of radiocesium sorbed and transported sediments within the Tomioka river basin in Fukushima Prefecture (2020)
  • Author(s): Hagiwara Hiroki、Konishi Hiromi、Nakanishi Takahiro、Fujiwara Kenso、Iijima Kazuki、Kitamura Akihiro
  • Journal Title: Journal of Environmental Radioactivity Volume: 211 Pages: 106042-106042
  • DOI: 10.1016/j.jenvrad.2019.106042
  • Peer Reviewed
• [Presentation] 環境中における放射性セシウムの鉱物への吸着特性に係る研究 -角閃石、長石への吸着- (2021)
  • Author(s): 萩原大樹、小西博巳
  • Organizer: 一般社団法人日本鉱物科学会2021年年会
• [Presentation] Novel application of mosses transplanted in bags as biointerceptors of airborne radioactive dusts after the Fukushima Dai-ichi Nuclear Power Station accident (2021)
  • Author(s): Di Palma, A., Adamo, P.; Dohi, Terumi, Fujiwara, Kenso, Hagiwara, Hiroki, Iijima, Kazuki
  • Organizer: European Geosciences Union General Assembly 2021 (vEGU21)
  • Int'l Joint Research
• [Presentation] Type A不溶性Cs粒子のケイ酸塩ガラスと3号機SGTSのフィルタ材との類似性 (2019)
  • Author(s): 萩原 大樹、井元 純平、日髙 昭秀
  • Organizer: 2019年 日本原子力学会
• [Presentation] 河川水系での放射性セシウムの移動媒体は何か (2018)
  • Author(s): 萩原大樹、小西博巳、中西貴宏、藤原健壮、飯島和毅
  • Organizer: 日本鉱物科学会