Rostock 2019 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 1: Accelerator Mass Spectrometry and Applications

MS 1.5: Vortrag

Montag, 11. März 2019, 11:45–12:00, U A-Esch 2

Long-term Behavior of Actinides from Global Fallout and In-situ Tracer Tests — •Francesca Quinto¹, Horst Geckeis¹, Karin Hain², Markus Plaschke¹, Thorsten Schäfer¹, and Peter Steier² — ¹Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology, Karlsruhe, Germany — ²Isotope Research and Nuclear Physics, University of Vienna, Vienna, Austria

In order to evaluate the safety of nuclear waste disposal in deep geological formations, the long-term behavior of the actinides (An) in the environment must be studied. This is possible, e.g., with the investigation of chronologically defined nuclear contaminations like the global fallout and in situ radionuclide tracer tests. At the Grimsel Test Site (GTS) located in the granitic rock of the Aar Massif in Switzerland, we have analyzed the global fallout derived U-236, Np-237 and Pu-239 and the tracers U-233, Np-237, Pu-242, Pu-244, Am-241 and Am-243 employed in several in situ tests. Thanks to the sensitivity of accelerator mass spectrometry, we have determined An concentrations ranging from pg/g down to ag/g in groundwater samples sized 0.1 to 250 g. Such analytical capability has allowed gaining valuable experimental data on the retention and migration of An during more than a decade in the crystalline rock at the GTS.