Rostock 2019 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 1: Accelerator Mass Spectrometry and Applications
MS 1.7: Vortrag
Montag, 11. März 2019, 12:15–12:30, U A-Esch 2
Test of Projectile X-ray AMS for Nuclear Waste Management — •Markus Schiffer, Lena Bussmann, Claus Müller-Gatermann, Richard Spanier, Susan Herb, Alexander Stolz, Stefan Heinze, Gereon Hackenberg, and Alfred Dewald — University of Cologne, Institute of Nuclear Physics, Germany
Projectile X-ray AMS (PXAMS) is a well-known method for isobar separation by the measurement of characteristic X-rays. The discrimination of AMS nuclide and isobar suffers from low X-ray production yields and detection efficiencies, compared to the detection with particle detectors. New commercial Fast Silicon Drift Detectors (FSDD) with large active area of 50 mm2 with high energy resolution, ΔE=123 eV at 5.9 keV, allow nowadays a high detection efficiency.
We investigate the projectile X-ray production yield at energies of 2 MeV/amu for medium mass isotopes on heavy stopper materials, like Au or U, to test its suitability as an alternative detection technique to liquid scintillator counting for the determination of isotopic concentrations of e.g. 90Sr, which plays an important role for nuclear waste management.
In this kind of reaction we observed shifts in X-ray energies which are explained in literature by molecular-like electron states for heavy ion collisions. This may became important for the background by Kβ, Lβ and Mβ lines.