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MS: Fachverband Massenspektrometrie

MS 8: Accelerator Mass Spectrometry and Applications I

MS 8.4: Vortrag

Mittwoch, 11. März 2020, 15:30–15:45, f128

Application of AMS to the research on nuclear waste disposal safety — •Francesca Quinto¹, Ingo Blechschmidt², Thomas Faestermann³, Karin Hain⁴, Dominik Koll³, Gunther Korschinek³, Stephanie Kraft¹, Johanna Pitters⁴, Markus Plaschke¹, Georg Rugel⁵, Thorsten Schäfer⁶, Peter Steier⁴, and Horst Geckeis¹ — ¹Karlsruhe Institute of Technology, Germany — ²National Cooperative for the Disposal of Radioactive Waste, Switzerland — ³Technical University of Munich, Germany — ⁴University of Vienna, Austria — ⁵Helmholtz-Zentrum Dresden-Rossendorf, Germany — ⁶Friedrich-Schiller-University, Jena, Germany

At the Grimsel Test Site (Switzerland), several in situ tracer tests aim at studying the possible radionuclide release from the bentonite engineered barrier system and the processes which may lead to their subsequent migration though the granodiorite host rock. We investigate the diffusion of Tc-99 and actinides (AN) through the bentonite and the remobilization over a time period of several years of the AN tracers employed in previous in situ tests. AMS is the ultra-trace analysis method of choice for studying the behaviour of Tc-99 and AN with concentration at and below fg/g levels in such dedicated long-term in situ tests, providing results that contribute to the safety evaluation of future nuclear waste repositories.