Hannover 2016 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 4: Resonance Ionization MS and others
MS 4.6: Vortrag
Dienstag, 1. März 2016, 16:00–16:15, f128
Resonant Laser-SNMS on actinides for spatially resolved ultra-trace analysis — •Michael Franzmann1,2, Hauke Bosco1, Linda Hamann1, Clemens Walther1, and Klaus Wendt2 — 1Institut für Radioökologie und Strahlenschutz, Leibniz Universität Hannover — 2Institut für Physik, Johannes Gutenberg Universität Mainz
The transport mechanisms and geochemical behavior of actinides in natural systems is of major importance to evaluate their distribution in geological formations at contaminated areas and storage sites. The composition analysis of hot particles, sorption on mineral surfaces and migration of trace concentrations of radionuclides requires an excellent suppression of organic background and isobaric contamination in combination with high spatial resolution while maintaining the natural structure of the sample. The new resonant Laser-SNMS system at the IRS Hannover was developed to cover those specifications by combining the high element selectivity of resonance ionization with the non-destructive spatially resolved analysis of a static TOF-SIMS. After the setup of a Ti:Sa laser system and the adaption of an IONTOF TOF.SIMS 5 for laser post-ionization we achieved a platform for a broad range of radioecological measurements. This talk presents the results of characterization and simulation based optimization of the system as well as latest measurements on artificial and environmental samples containing uranium, plutonium and other radionuclides.