Mainz 2017 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 6: Accelerator Mass Spectrometry and Applications I
MS 6.6: Vortrag
Mittwoch, 8. März 2017, 16:00–16:15, RW 2
Analysis of 233U/236U in environmental samples — •Karin Hain1, Peter Steier1, Rosmarie Eigl2, Robin Golser1, Xiaolin Hou3, Johannes Lachner1, Jixin Qiao3, Francesca Quinto4, and Aya Sakaguchi2 — 1University of Vienna, Faculty of Physics, Austria — 2Hiroshima University, Japan — 3Technical University of Denmark, Denmark — 4Karlsruhe Institute of Technology, Germany
For the tracing of environmental waters, long-lived radionuclides of soluble elements like U, which mainly behave conservatively in water, are demanded. Even though 236U (T1/2=2.342·107 a) in many cases is a suitable tracer for this application, the results on the concentration of 236U can be difficult to interpret, e.g. for several contamination sources. The Accelerator Mass Spectrometry set-up at the Vienna Environmental Research Accelerator (VERA) has recently increased its detection efficiency for actinides such that it is now capable to detect also 233U (T1/2=1.592·105 a) in environmental samples. The detected average 233U/236U ratio in the environment is at a level of around 1%. First, preliminary results of 233U/236U in different types of sample material, e.g. corals, sediments, peat bog and sea water will be presented in this talk. These results indicate a predominant production of 233U in a specific type of thermonuclear explosions which allows for source identification.