Erlangen 2018 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 5: Accelerator Mass Spectrometry 1
MS 5.6: Vortrag
Mittwoch, 7. März 2018, 15:30–15:45, R 1.020
Ultra-trace analysis of Tc-99 with AMS in environmental samples — •Francesca Quinto1, Christoph Busser2, Thomas Faestermann2, Horst Geckeis1, José-Manuel Gomez-Guzman2, Karin Hain3, Dominik Koll2, Gunther Korschinek2, Peter Ludwig2, Markus Plaschke1, and Thorsten Schäfer1 — 1Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology, Karlsruhe, Germany — 2Physics Department, Technical University of Munich, Garching, Germany — 3Isotope Research and Nuclear Physics, University of Vienna, Vienna, Austria
Tc-99 originating from global fallout, accidents and activities related to nuclear energy production shows environmental levels down to 1E+7 atoms/g (ca. 1.6 fg/g). The analytical capability of determining Tc-99 at such ultra-trace levels offers the possibility to investigate its behavior in a variety of environmental systems. The main limitation to the sensitivity of the mass spectrometric analysis of Tc-99 is the background of its stable isobar Ru-99. For ultra-trace analysis, in addition to a chemical separation of Tc from Ru, the Gas-Filled Analyzing Magnet System (GAMS) at the 14 MV Tandem AMS facility of the Technical University of Munich is greatly effective in suppressing the interference from Ru-99. In the frame of studies on the safe management of nuclear waste, we present our recent results in the analysis of Tc-99 in natural samples and reference materials using AMS.