Hannover 2020 – wissenschaftliches Programm
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MS 8.5: Vortrag
Mittwoch, 11. März 2020, 15:45–16:00, f128
Ultra-trace Detection of 99Tc in Environmental Samples by Accelerator Mass Spectrometry — •Johanna Pitters1,2, Thomas Faestermann3, Fadime Gülce1, Karin Hain1, Dominik Koll3,4, Gunther Korschinek3, Martin Martschini1, Francesca Quinto5, Georg Rugel6, and Robin Golser1 — 1University of Vienna, Isotope Physics, Austria — 2Vienna Doctoral School in Physics, Austria — 3Technical University of Munich, Germany — 4The Australian National University, Australia — 5Karlsruhe Institute of Technology, Germany — 6Helmholtz-Zentrum Dresden-Rossendorf, Germany
In our project we are developing methods for the detection of the anthropogenic radionuclide 99-Technetium by Accelerator Mass Spectrometry (AMS). For environmental samples, a highly effective chemical sample preparation method was developed, that removes a large fraction of the interfering elements Ruthenium and Molybdenum and embeds the Tc in a Niobium matrix. The samples were measured at the AMS setup of the Maier-Leibnitz-Laboratory in Munich by extraction of 99TcO− from the ion source, stripping to 99Tc12+ and normalizing to the 93Nb11+ current. A particle energy of 150 MeV in combination with the detection via a Time-of-Flight path and the Gas-filled Analyzing Magnet System (GAMS) allows for a sensitivity of 5·106 atoms per sample. The method is discussed together with results from environmental samples. In particular, 99Tc concentrations along a water column from the Pacific Ocean, as well as in porewater from an Austrian peat-bog are presented.