Hannover 2016 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 5: Posters I
MS 5.3: Poster
Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof
Spectroscopy and Laser-SNMS on stable and radioactive Strontium — •Hauke Bosco1, Michael Franzmann1,2, Tobias Kron2, Clemens Walther1, and Klaus Wendt2 — 1Institut für Radioökologie und Strahlenschutz, Leibniz Universität Hannover — 2Institut für Physik, Johannes Gutenberg Universität Mainz
Nuclear accidents as experienced e.g. in Chernobyl or Fukushima and nuclear weapon tests released considerable activity levels and a variety of medium to long-lived radionuclides into the environment. Strontium-90 appears as a significant share of the fission products in spent nuclear fuel and correspondingly in any possible release. Due to its chemical properties it is subject to long range transport through the environment and can cause considerable dose to man when entering the food chain. Correspondingly, the investigation of speciation and migration channels is of major relevance. A radioanalytical approach is severely hampered by the low beta energy of the strontium-90 decay and the need to separate strontium-90 from the secular equilibrated daughter yttrium-90. Hence, application of a mass spectrometric method without chemical separation of the elements is a promising alternative for low-level investigation of strontium-90. Application of the new Laser-SNMS system at IRS Hannover could well suit those needs. It applies three Ti:Sa lasers for resonant ionization of neutral atoms produced by primary ion sputtering in a SIMS together with a time-of-flight mass analysis which provides high spatial resolution. The analytical measurements are preceded by spectroscopic studies on the level structure of strontium to develop a most efficient ionization scheme.