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VERA Seminar

Source identification by isotopic analysis of actinides with AMS and its application to environmental waters

Karin Hain, Fakultät für Physik – Isotopenforschung und Kernphysik, Universität Wien

The isotopic plutonium ratio 240Pu/239Pu has proven to be very useful to study the transport of Pu attributed to different types of fallout in the water column of the Pacific Ocean. For the identification of a recent entry of Pu as by the Fukushima accident, the relatively short-lived 241Pu (T1/2 = 14.325 a) is a well-suited indicator, since 241Pu from fallout of weapon tests has already significantly decayed. The isotopic ratios 240Pu/239Pu and 241Pu/239Pu were determined by accelerator mass spectrometry (AMS) in Pacific Ocean water samples collected in late 2012. 241Am, which causes isobaric background on 241Pu in mass-spectrometric measurements, was separated by extraction chromatography. The results of ocean water samples measured at the Vienna Environmental Research Accelerator (VERA) will be discussed in the first part of the talk.

In order to trace environmental waters, soluble elements like U are preferable. VERA has recently increased its detection efficiency such that it is now capable to detect the U ratio 233U/236U in environmental samples. First results of 233U/236U in different sample materials will be presented.


Donnerstag, 20.10.2016    16:30 Uhr

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1090 Wien


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