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SAMOP 2023 – scientific programme

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MS: Fachverband Massenspektrometrie

MS 8: Accelerator Mass Spectrometry III

MS 8.2: Talk

Friday, March 10, 2023, 11:30–11:45, F128

Isobar separation in the actinide range with ILIAMS — •Andreas Wiederin1,2, Karin Hain1, Martin Martschini1, Aya Sakaguchi3, Peter Steier1, and Robin Golser11University of Vienna, Faculty of Physics - Isotope Physics, Austria — 2University of Vienna, Vienna Doctoral School in Physics, Austria — 3University of Tsukuba, Faculty of Pure and Applied Science, Japan

Isobaric background is among the main obstacles to the development of new AMS applications. By combining ILIAMS (Ion Laser InterAction Mass Spectrometry) with the actinide beamline of VERA (Vienna Environmental Research Accelerator), instrumental isobar separation in the mass range of the actinides has become available for the first time in AMS. ILIAMS combines an RFQ ion guide with high-powered lasers or reactive gases for isobar separation of anions at thermal energies.

The first application for ILIAMS in this mass range is the characterization of a recently produced 236Np spike material intended for normalizing environmental 237Np measurements. ILIAMS is used to monitor potential isobaric interference from 236U or 236Pu co-produced alongside the desired 236Np and even suppresses 236U by several orders of magnitude.

The isotopic ratios 238Pu/239Pu, 241Pu/241Pu, and 238Pu/241Pu are used as fingerprints for nuclear emission sources but partially require extensive chemical separation procedures and tedious radiochemical analysis. First results indicate that ILIAMS will also enable unambiguous mass-spectrometric access to 238,241Pu usually superimposed by isobaric background from 238U and 241Am, respectively.

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