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Erlangen 2022 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 4: Accelerator Mass Spectrometry

MS 4.7: Vortrag

Mittwoch, 16. März 2022, 12:15–12:30, MS-H9

Normalization methods for the analysis of environmental 99Tc — •Stephanie Adler, Karin Hain, Martin Martschini, Fadime Gülce, and Robin Golser — University of Vienna, Faculty of Physics

Quantification of the anthropogenic radionuclide 99Tc (t1/2=2.1 · 105 yr) in the general environment by AMS requires suppression of the stable isobaric background of 99Ru and a reliable normalization method to overcome the lack of a stable Tc isotope.

At VERA, previous research has shown that extracting TcF5 from the ion source is suitable for Ion Laser InterAction Mass Spectrometry (ILIAMS) as RuF5 can be suppressed by a laser by up to 105.

Experiments at other AMS-facilities using TcO normalized the 99Tc to the 93Nb-current of the matrix material with a precision of 30%. Using this approach, our experiments showed Tc-deficits of >40%, indicating major loss of Tc during sample preparation. This lead to thorough investigations of the final target preparation steps utilizing 95Tc and γ-Spectrometry. The chemical recovery was improved to reliable yields >92%, by lowering the calcination temperature.

When extracting 99TcF5 from the source as required for ILIAMS, the Nb-normalization scatters by a factor of 10 and seems less reliable. Thus research on using an alternative spike material 103Rh for normalization is currently ongoing.

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