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$$^{129}$$I/$$^{127}$$I and $$Delta$$$$^{14}$$C records in a modern coral from Rowley Shoals off northwestern Australia reflect the 20th-century human nuclear activities and ocean/atmosphere circulations

Mitsuguchi, Takehiro ; Okabe, Nobuaki*; Yokoyama, Yusuke*; Yoneda, Minoru*; Shibata, Yasuyuki*; Fujita, Natsuko   ; Watanabe, Takahiro   ; Kokubu, Yoko   

For a contribution to developing the usage of iodine-129 ($$^{129}$$I) as a tracer of deep-seated fluid, $$^{129}$$I/$$^{127}$$I and $$Delta$$$$^{14}$$C were measured for annual bands (AD 1931-1991) of a modern coral collected from Northwestern Australia; the measurements were performed using the JAEA-AMS-TONO-5MV for $$^{129}$$I/$$^{127}$$I and an AMS facility of the University of Tokyo for $$Delta$$$$^{14}$$C. Results indicate that both $$^{129}$$I/$$^{127}$$I and $$Delta$$$$^{14}$$C distinctly increase from 1950s. The $$Delta$$$$^{14}$$C increase can be ascribed to atmospheric nuclear tests, while the $$^{129}$$I/$$^{127}$$I increase is due to nuclear-fuel reprocessing as well as atmospheric nuclear tests. These results are in good agreement with previous studies, indicating that the $$^{129}$$I/$$^{127}$$I measurement by JAEA-AMS-TONO-5MV has been further developed.

Language

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English

Journal

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Journal of Environmental Radioactivity

Volume

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235-236

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Pages

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p.106593_1 - 106593_10

Publication Year/Month

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2021/09

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Patent information

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Paper URL

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https://doi.org/10.1016/j.jenvrad.2021.106593

DOI for research data

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Keywords

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ヨウ素129; 炭素14; 大気圏核実験; 核燃料再処理; 海洋循環; 大気循環

Research Facility

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ペレトロン年代測定装置  

Press Release

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Article of JAEA R&D Review

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Cooperating Institute

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経済産業省資源エネルギー庁

Accesses

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- Accesses

InCites™

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Percentile:35.21

Category:Environmental Sciences

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