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Hannover 2016 – scientific programme

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MS: Fachverband Massenspektrometrie

MS 9: Accelerator Mass Spectrometry and Applications II

MS 9.2: Talk

Thursday, March 3, 2016, 15:00–15:15, f128

Detection of Pu in Pacific Ocean water with AMS related to the Fukushima accident — •Karin Hain1, Thomas Faestermann1, Leticia Fimiani1, Robin Golser2, José Manuel Guzmán1, Gunther Korschinek1, Florian Kortmann1, Christoph Lierse v. Gostomski1, Peter Ludwig1, Peter Steier2, and Masatoshi Yamada31TUM, Germany — 2Universität Wien, Austria — 3Hirosaki University, Japan

The concentration of plutonium (Pu) and its isotopic ratios were determined by accelerator mass spectrometry (AMS) in Pacific Ocean water samples. The isotopic ratios 240Pu/239Pu and 241Pu/239Pu can be used to identify a possible release of Pu into the ocean by the Fukushima accident. 241Pu from fallout of nuclear weapon testings has already significantly decayed. 241Am, the daughter nuclide of 241Pu, causes isobaric background on 241Pu in mass-spectrometric measurements. Therefore, Am and Pu had to be separated chemically using extraction chromatography. The method was verified by analyzing certified reference material. 12 sea water samples, collected at different depths, were prepared at the Radiochemie München. The concentration of Pu was measured with AMS at the Maier-Leibnitz-Laboratory in Munich and the Vienna Environmental Research Laboratory (VERA). After a short motivation related to the Fukushima accident, the chemical separation method will be presented. Preliminary results of the distribution of Pu in ocean water will be discussed. This work was funded by the Studienstiftung des deutschen Volkes. We would like to acknowledge the valuable support of T. Shinonaga.

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