SAMOP 2023 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 7: Poster

MS 7.7: Poster

Donnerstag, 9. März 2023, 16:30–19:00, Empore Lichthof

Novel use of Actinide Resin^® for multi-actinide analysis with AMS — •Thomas Roth¹, Francesca Quinto¹, Markus Plaschke¹, Karin Hain², Peter Steier², and Horst Geckeis¹ — ¹Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), Germany — ²Faculty of Physics, University of Vienna, Austria

Fe(OH)₃ co-precipitation and conversion to an Fe₂O₃ specimen is an effective procedure for group separation (without subsequent column separation) and concurrent determination of actinides in aqueous environmental samples using AMS. However, matrix elements like Al and Si can also be precipitated in the process and thus increase the AMS specimen′s mass. As previously observed, the overall detection efficiency of the actinides decreases with increasing matrix content of the AMS specimen, partly due to a dilution effect. A novel procedure employing Actinide Resin^® has been tested and compared to the Fe(OH)₃ co-precipitation for preparation of two sets of six Rhine River water samples (each 2 L volume) collected near the French Fessenheim NPP. Preliminary results for separation efficiency indicate that the use of Actinide Resin^® reduces the Al and Si content of the AMS specimen by ca. 80%. Such a result is supported by a similar reduction of the specimen mass. The results obtained with the two preparation methods were consistent with each other, indicating global fallout as origin with concentrations of ca. 10⁷ atoms/L for ²³⁷Np, ca. 10⁷ atoms/L for ²³⁶U and Pu at background level.