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MS: Fachverband Massenspektrometrie
MS 8: Accelerator Mass Spectrometry I
MS 8.4: Vortrag
Donnerstag, 13. März 2025, 16:45–17:00, HS 2 Chemie
Advanced chemical sample preparation of soil and concrete for AMS measurements of 90Sr — •Oscar Marchhart1,2,3, Markus Schiffer3, Martin Martschini1, Silke Merchel1, Melisa Maslo3, Erik Strub3, Laura Frost4, Tibor Dunai3, Dennis Mücher3, and Robin Golser1 — 1University of Vienna, Faculty of Physics, Austria — 2University of Vienna, Vienna Doctoral School in Physics, Austria — 3University of Cologne, Faculty of Mathematics and Natural Sciences, Germany — 4JEN Jülicher Entsorgungsgesellschaft für Nuklearanlagen mbH, Germany
An advanced sample preparation method for measuring 90Sr (T1/2 = 28.91 a) by Accelerator Mass Spectrometry (AMS) in soil and concrete samples has been developed. Based in general on published recipes, it increases the AMS measurement efficiency of 90Sr for soil samples by 50% within the first hour of sputtering time. As earlier and newly prepared SrF2 have the same chemical yield, we interpret the higher ion source output as less CaF2 and other contaminations in SrF2. For the first time concrete samples have been processed with chemical yields of SrF2 >90% for AMS measurements. These were performed using the unique Ion-Laser InterAction Mass Spectrometry (ILIAMS) setup at the Vienna Environmental Research Accelerator (VERA), which achieves an isobar suppression of >1012 for 90Zr. The sample preparation and AMS measurements were validated using IAEA reference materials for soil, and with known LSC results for concrete. Within 1-sigma the AMS results are in good agreement and yield results for samples below the LSC limit due to the low detection limit of <0.1 mBq.
Keywords: sample preparation; 90Sr; AMS; ILIAMS