SAMOP 2023 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 7: Poster

MS 7.12: Poster

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

Assessment of anthropogenic actinide background levels on the ground of the new 1-MV compact AMS system HAMSTER at HZDR — •Sebastian Fichter¹, Anton Wallner¹, Karin Hain², and Michael Hotchkis³ — ¹Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Dresden, Germany — ²University of Vienna, Faculty of Physics, Isotope Physics, Vienna, Austria — ³Australian Nuclear Science and Technology Organisation, Lucas Heights, Australia.

The new multi-purpose 1-MV AMS facility HAMSTER (Helmholtz Accelerator Mass Spectrometer for Tracing Environmental Radionuclides) is built within the HZDR research campus in Dresden-Rossendorf starting in 2022. The new machine is especially dedicated to the analysis of ultra-trace levels of actinides in environmental samples. Therefore, eventual contamination of the site where the new accelerator building is being constructed should be avoided and clarified. Hence, several soil samples close to the construction site of the new accelerator building have been analyzed to assess the content and isotopic ratios of the actinides U, Np and Pu. The samples have been processed in the existing chemistry labs of HZDR’s 6-MV DREAMS facility showing low background levels. Overall, the samples show expected signatures of global fallout in Pu concentrations and ^APu/²³⁹Pu ratios. However, in some samples increased ²³⁶U concentrations and relatively low ²³³U/²³⁶U atomic ratios have been detected pointing to an additional source of ²³⁶U. Additional analysis is currently ongoing.