Heidelberg 2015 – scientific programme
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MS: Fachverband Massenspektrometrie
MS 5: Resonance Ionization
MS 5.3: Talk
Tuesday, March 24, 2015, 15:15–15:30, PH/HS2
Resonant Laser-SNMS for spatially resolved ultra-trace analysis of radionuclides — •Michael Franzmann1,2, Linda Hamann1, Klaus Wendt2, and Clemens Walther1 — 1Institut für Radioökologie und Strahlenschutz, Leibniz Universität Hannover — 2Institut für Physik, Johannes Gutenberg Universität Mainz
The understanding of chemical behavior of most radionuclides in different natural compartments and anthropogenic systems, i.e. the investigation on speciation and transport mechanisms, requires more than just the determination of amount and isotope ratios of the contamination in a sample. Information about microscopic structural formation, e.g. onto nanoparticles, or sorption processes on different particle or surface materials is of primary relevance for the assessment of contamination threats. This is particularly valid in case of accidents or undeclared releases from nuclear power reactors, reprocessing plants or nuclear waste repositories. The system for resonant Laser-SNMS at the IRS Hannover is setup to combine the excellent element selectivity and efficiency of resonant laser ionization with the submicron spatial resolution and high mass resolution of a commercial TOF-SIMS. Sputtering by primary ions in combination with element selective ionisation allows to prevent chemical preparation, which most likely destroys the structural information in conventional radiometric or mass spectrometric approaches. The applied Ti:Sa laser system was developed at University of Mainz for radioecological bulk sample analysis. The ability of this Laser-SNMS system to analyze and map ultra-trace amounts of radionuclides is currently tested on environmental samples.