Rostock 2019 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 1: Accelerator Mass Spectrometry and Applications
MS 1.4: Vortrag
Montag, 11. März 2019, 11:30–11:45, U A-Esch 2
Tracing Nuclear Weapons Fallout Actinides and 99Tc by AMS — •Karin Hain1, Fadime Gülce1, Michael Kern1, Gunther Korschinek2, Johannes Lachner1, Martin Martschini1, Peter Steier1, Jan Welch3, Masatoshi Yamada4, and Robin Golser1 — 1Universität Wien, Austria — 2Technische Universität München, Germany — 3Technische Universität Wien, Austria — 4Hirosaki University, Japan
Long-lived radionuclides emitted into the environment by nuclear weapons tests can be used to study their migration behaviour under different physio-chemical conditions. In order to allow a direct comparison, at VERA (Vienna Environmental Research Accelerator), we aim to analyse as many radionuclides as possible from the same sample. This requires a high overall detection efficiency including chemical sample preparation. The current procedure, which allows us to analyze 233,236U, 239,240Pu, 237Np and 241Am from the same 10 L ocean water sample, and depth profiles from the Pacific Ocean analysed accordingly will be discussed. In this context, experiments on the negative ion yield of Uranium from the ion source are being conducted from which the latest results will be presented. We recently started a project on the detection of nuclear weapons fallout 99Tc in different environmental reservoirs. A chemical purification procedure adjustable to the respective sample matrix is currently being developed using a 99mTc tracer. Preliminary results on the chemical recovery of different approaches and test measurements at the Maier-Leibnitz-Laboratory will be discussed.