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Erlangen 2022 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 4: Accelerator Mass Spectrometry

MS 4.3: Vortrag

Mittwoch, 16. März 2022, 11:15–11:30, MS-H9

Separation of U and Np Isobars by ILIAMS — •Andreas Wiederin1, Karin Hain1, Martin Martschini1, Aya Sakaguchi2, Peter Steier1, and Robin Golser11University of Vienna, Faculty of Physics - Isotope Physics, Austria — 2University of Tsukuba, Faculty of Pure and Applied Science, Japan

237Np (T1/2=2.1 Ma) is the second most abundant anthropogenic actinide in the environment, but a reliable quantification by AMS independent of the environmental matrix would require an isotopic spike for normalization. We currently consider 236Np the most suitable candidate to serve this purpose. Such a spike material is currently under development and needs a careful characterization regarding interfering by-products. Possible isobaric background from 236U necessitates the separation of U and Np by chemical means and/or during the AMS measurement. Ion Laser InterAction Mass Spectrometry (ILIAMS) uses selective laser photodetachment inside an RFQ ion cooler to neutralize anions of the interfering isobar. By applying a 2.33 eV laser, UF4 has been suppressed by at least four orders of magnitude in recent experiments, while NpF4 passed unaffected. The comparatively low formation rate and high sensitivity to interactions with the buffer gas of UF4 further increased the suppression relative to NpF4. This result represents the first isobar separation in the mass range of the actinides in AMS. The U suppression achieved is already sufficient for the application of 236Np to quantitatively determine 237Np by isotope ratio measurements.

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