SAMOP 2023 – scientific programme
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MS: Fachverband Massenspektrometrie
MS 6: Accelerator Mass Spectrometry II
MS 6.1: Talk
Thursday, March 9, 2023, 14:30–14:45, F128
Status and development of Sr-90 measurements at CologneAMS — •Gereon Hackenberg1, Markus Schiffer1, Susan Herb1, Dominik Elchine2, Stefan Heinze1, Carlo Baddeliyanage1, Elisa Chopan1, Devin Hymers1, Martina Gwozdz1, Tom Sittig1, Erik Strub2, Alfred Dewald1, and Dennis Mücher1 — 1Institute for Nuclear Physics, University of Cologne — 2Division of Nuclear Chemistry, University of Cologne
90Sr is produced by nuclear fission and is a prominent nuclide in nuclear waste and fallout. Since the decay of 90Sr produces no γ rays, but only low energy β rays, the detection mainly depends on the β decay of the daughter nucleus 90Y. This demands a complex chemical treatment, because a probe has to be free of other beta emitters.
Using accelerator mass spectrometry 90Sr can be measured directly. Here main efforts are a high sputter efficiency and the suppression of the stable isobar 90Zr.
Measurements have been performed at the 10MV tandem accelerator in Cologne using standards produced at the department of nuclear chemistry. At 9MV a full separation of 90Sr and 90Zr was achieved. This contribution will present charge state distributions behind the stripper, transmission measurements, dE/dx-measurements with our multi anode gas ionization detector and sensitivity limits of the current setup for multiple energies.
This technique will be applied to characterize soil samples from the AVR Jülich.