Heidelberg 2015 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 14: Accelerator Mass Spectrometry and Applications 4
MS 14.2: Vortrag
Freitag, 27. März 2015, 11:30–11:45, PH/HS2
Determination of Actinides in Pacific Ocean Water by AMS with Respect to the Fukushima Accident — •Karin Hain1, Boyana Deneva1, Thomas Faestermann1, Nicolai Famulok1, Leticia Fimiani1, José M. Gómez-Guzmán1, Gunther Korschinek1, Florian Kortmann2, Christoph Lierse v. Gostomski2, and Peter Ludwig1 — 1Physics Department, Technische Universität München, James-Franck-Str.1, 85748 Garching — 2Radiochemie München, Technische Universität München, Walther-Meißner-Str.3, 85748 Garching
A chemical separation procedure for plutonium (Pu) and neptunium (Np) was developed using extraction chromatography to determine their amounts and isotopic ratios in sea water. 241Am, which causes isobaric background on 241Pu in mass-spectrometric measurements, was successfully separated from the Pu fraction by this method. Water samples which were spiked with 242Pu and 237Np or 239Np, respectively, were used for chemical yield determination. Chemical yields of Pu and Np, which were determined by alpha and gamma spectrometry at the Radiochemie München, of more than 85 % were obtained. The developed method was applied to analyze the amount of Pu and Np in the certified reference material, IAEA-443, by accelerator mass spectrometry (AMS) at the Maier-Leibnitz-Laboratory to check the applicability of the method. The amounts of 240Pu, 241Pu and 237Np obtained in this study are in agreement with the literature values within the uncertainties. This method can be used for the analysis of Pu and Np in Pacific Ocean water samples collected after the Fukushima accident.