Dose assessment of external radiation exposure in Fukushima children using decidous teeth.
Project/Area Number |
18K09906
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 57080:Social dentistry-related
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Research Institution | Tohoku University |
Principal Investigator |
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Co-Investigator(Kenkyū-buntansha) |
木野 康志 東北大学, 理学研究科, 教授 (00272005)
千葉 美麗 東北大学, 歯学研究科, 講師 (10236820)
清水 良央 東北大学, 歯学研究科, 助教 (30302152)
高橋 温 東北大学, 大学病院, 准教授 (50333828)
鈴木 敏彦 東北大学, 歯学研究科, 准教授 (70261518)
岡 壽崇 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 原子力科学研究所 原子力基礎工学研究センター, 研究副主幹 (70339745)
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Project Period (FY) |
2018-04-01 – 2022-03-31
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Project Status |
Completed (Fiscal Year 2021)
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Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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Keywords | 福島第一原発事故 / 外部被ばく / 乳歯 / ESR / 炭酸ラジカル / 外部被ばく量 / 内部被ばく量 / ESR法 / 重液分離 |
Outline of Final Research Achievements |
Radiation exposure generates stable carbonic radicals that remain in the teeth for long periods of time. The levels of these radicals in teeth may serve as an index of an individual’s external exposure. Electron spin resonance quantification of carbonic radicals in teeth has been used to estimate the levels of external exposure. However, the detection limit of this technique has been reported to be greater than 200mGy, and it is not sufficiently sensitive to detect exposure to low radiation doses, such as those less than 100mGy. In this study, we optimized the technique to quantify small quantities of radicals in teeth exposed to radiation doses less than 50mGy. Using this technique, we analyzed eight deciduous teeth from children moved from evacuation zone in Fukushima. The level of external exposure was estimated to be greater than 100mGy in one of the eight teeth examined. More than 50 teeth collected from children in different areas in Fukushima are now under investigation.
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Academic Significance and Societal Importance of the Research Achievements |
ヒト・動物を問わず、放射線の生物への影響を評価する場合、被ばく量を個体単位で知ることが極めて重要となる。本研究は、放射線被ばくにより歯の中に蓄積する炭酸ラジカル量をESR法により測定し、個体の外部被ばく量を歯から推定しようとするもので、放射線の健康への影響を調査するための基礎資料を提供しようとする新しい試みである。本研究で用いる手法は、ヒトを含め、歯を持つ動物すべてに応用可能と考えられ、被ばく線量を個体レベルで把握することが困難な野生動物に対しても広く応用可能であり、放射線の生物影響を明らかにしようとする様々なフィールドワークに対して、有用な研究手段を提供するものと考えられる。
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Report
(5 results)
Research Products
(41 results)
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[Journal Article] External exposure dose estimation by electron spin resonance technique for wild Japanese macaque captured in Fukushima Prefecture.2020
Author(s)
Toshitaka Oka, Atsushi Takahashi, Kazuma Koarai, Yusuke Mitsuyasu, Yasushi Kino, Tsutomu Sekine, Yoshinaka Shimizu, Mirei Chiba, Toshihiko Suzuki, Ken Osaka, Keiichi Sasaki, Yusuke Urushihara, Satoru Endoh, Masatoshi Suzuki, Hisashi Shinoda and Manabu Fukumoto.
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Journal Title
Radiation Mesurements
Volume: 134
Pages: 106315-106315
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Environmental radiation on large Japanese field mice in Fukushima reduced colony forming potential in hematopoietic progenitor cells without inducing genomic instability.2020
Author(s)
Ariyoshi, Tomisato Miura, Kosuke Kasai, Valerie Swee Ting Goh, Yohei Fujishima, Akifumi Nakata, Atsushi Takahashi, Yoshinaka Shimizu, Hisashi Shinoda, Hideaki Yamashiro, Colin Seymour, Carmel Mothersill & Mitsuaki A. Yoshida.
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Journal Title
International Journal of Radiation Biology
Volume: 96
Issue: 6
Pages: 1-12
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] External exposure dose estimation of wild Japanese macaques captured in Fukushima Prefecture: Decomposition of electron spin resonance spectrum2021
Author(s)
Mitsuyasu Yusuke, Toshitaka Oka, Atsushi Takahashi, Yasushi Kino, Kenichi Okutsu, Tsutomu Sekine, Takuma Yamashita, Yoshinaka Shimizu, Mirei Chiba, Toshihiko Suzuki,Masatoshi Suzuki, Hisashi Shinoda
Organizer
EPRBioDose
Related Report
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[Presentation] Role of animal teeth for estimation of environmental pollution of Sr-90 and Cs-137 just after the Fukushima Daiichi Power Plant Accident2018
Author(s)
Kazuma Koarai, Yasushi Kino, Junpei Nishiyama, Hiraku Kaneko, Atsushi Takahashi, Toshihiko Suzuki, Shimizu Yoshinaka, Mirei Chiba, Ken Osaka, Keiichi Sasaki, Yusuke Urushihara, Tomokazu Fukuda, Emiko Isogai, Hideaki Yamashiro, Toshitaka Oka, Tsutomu Sekine, Manabu Fukumoto, Hisashi Shinoda,
Organizer
The 18th Radiochemical Conference (RadChem2018) (国際学会)
Related Report
Int'l Joint Research
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[Presentation] Improvement of the electron spin resonance spectroscopy detection limit for tooth dosimetry2018
Author(s)
Toshitaka Oka, Atsushi Takahashi, Kazuma Koarai, Yasushi Kino, Tsutomu Sekine, Yoshinaka Shimizu, Mirei Chiba, Toshihiko Suzuki, Jun Aida, Ken Osaka, Keiichi Sasaki, Hisashi Shinoda,
Organizer
EPR BioDose 2018 (国際学会)
Related Report
Int'l Joint Research
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[Presentation] Strontium-90 separation method for soil from the Fukushima environment2018
Author(s)
Kazuma Koarai, Yasushi Kino, Atsushi Takahashi, Toshihiko Suzuki, Yoshinaka Shimizu, Mirei Chiba, Ken Osaka, Yusuke Urushihara, Toshitaka Oka, Tsutomu Sekine, Manabu Fukumoto and Hisashi Shinoda,
Organizer
Tohoku University's Chemistry Summer School 2018, 2018/8/27-28, Sendai, Japan
Related Report
Int'l Joint Research
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[Book] “Incorporation and Accumulation of Strontium-90 in the Hard Tissue of Animals and Their Relationship with Strontium-90 Pollution in the Environment” in “Low-Dose-Rate Radiation Effects on Animals and Ecosystem-Long-Term Study on the Fukushima Daiichi Nuclear Power Plant Accident” Ed. By M. Fukumoto2019
Author(s)
K. Koarai, Y. Kino, T. Oka, A. Takahashi, T. Suzuki, Y. Shimizu, M. Chiba, K. Osaka, K. Sasaki, T. Fukuda, E. Isogai, H. Yamashiro, T. Sekine, M. Fukumoto, H. Shinoda.
Total Pages
250
Publisher
Springer
ISBN
9789811382178
Related Report