Berlin 2014 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 6: Poster
MS 6.13: Poster
Mittwoch, 19. März 2014, 14:00–14:00, DO24 Foyer
Spatially resolved ultra-trace analysis of plutonium and technetium with resonant Laser-SNMS — •Michael Franzmann1,2, Sven Kayser3, Klaus Wendt2, and Clemens Walther1 — 1Institut für Radioökologie und Strahlenschutz, Leibniz Universität Hannover — 2Institut für Physik, Universität Mainz — 3ION-TOF GmbH, Münster
The geochemical behaviour of plutonium is of major concern for the safety analysis of contaminated sites. It is necessary to analyze the sorption on minerals and nanoparticles to elucidate the interactions in the environment and predict future migration and transport mechanisms. Therefore a system for resonant Laser-SNMS is currently being developed at the IRS Hannover. This system combines a commercial TOF-SIMS (IONTOF) with a Ti:sapphire laser system, which will be set up and tested by the Institute of Physics at University of Mainz. Identical laser systems are used there for resonance ionization of stable and radioisotopes for many years. Due to the high spatial resolution of the TOF-SIMS ion gun, the good mass resolution of the time-of-flight mass spectrometer and the excellent element selectivity of resonant ionization this laser mass spectrometric approach is seen as most promising system for ultra-trace analysis on actinides and fission products. For definition and design of the analytical system precise simulations on ion optics and mass spectrometer lay out are programmed to ensure highest efficiency together with suitable mass resolution. This simulation program optimizes the path of the ionized particle cloud through the ion optical structure of the mass spectrometer.