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MS: Fachverband Massenspektrometrie

MS 6: Isobar Suppression Techniques

MS 6.1: Hauptvortrag

Donnerstag, 13. März 2025, 11:00–11:30, HS 2 Chemie

Isobar analysis in the actinide range and the characterization of an isotopic Np spike — •Andreas Wiederin^1,2,3, Martin Martschini¹, Aya Sakaguchi⁴, Peter Steier¹, and Karin Hain¹ — ¹University of Vienna, Faculty of Physics, Isotope Physics Austria — ²University of Vienna, Vienna Doctoral School in Physics, Austria — ³Austrian Academy of Sciences, Austria — ⁴University of Tsukuba, Institute of Pure and Applied Sciences, Japan

²³⁷Np is the second most abundant anthropogenic actinide in the environment and has great potential as an environmental tracer. An isotopic Np spike would solve the problem of normalization for mass spectrometric ²³⁷Np measurements in a robust and reliable manner. Such a material has been produced via the ²³²Th(⁷Li,3n)^236gNp reaction at the Nishina AVF cyclotron (<10¹⁰at ^236gNp). The co-production of the isobars ²³⁶U, ²³⁶Pu presented a challenge for the spike characterization since no AMS facility could distinguish isobars in this high mass range. An approach that combines AMS (Accelerator Mass Spectrometry), AFIA (Anion Formation Isobar Analysis) and the first non-chemical isobar separation in the actinide range in AMS using ILIAMS (Ion Laser InterAction Mass Spectrometry) has been developed to characterize a Np spike candidate. This pilot spike has been applied to a selection of environmental samples to analyze ²³⁷Np. This work was funded by the Austrian Science Fund (FWF): [I-4803-N], a Dimitrov Fellowship of the Austrian Academy of Sciences, and supported by the Vienna Doctoral School in Physics, the Japanese Society for the Promotion of Sciences, and the ERAN network.

Keywords: AMS; ILIAMS; Neptunium; Actinides; Isobars