Heidelberg 2015 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 5: Resonance Ionization
MS 5.4: Vortrag
Dienstag, 24. März 2015, 15:30–15:45, PH/HS2
Resonance Ionization Mass Spectrometry (RIMS) for ultratrace analysis of Technetium — •Pascal Schoenberg1, Daniela Schoenenbach1, Sebastian Zeisel1, Norbert Trautmann1, Petra Thoerle-Pospiech1, Joerg Runke1, Tobias Kron2, Klaus Wendt2, and Tobias Reich1 — 1Institute of Nuclear Chemistry, Johannes Gutenberg-University, Mainz, Germany — 2Institute of Physics, Johannes Gutenberg-University, Mainz, Germany
The determination of ultratrace amounts of the long-lived β-emitter 99gTc is difficult with radiometric methods. Common mass spectrometric techniques such as ICP-MS might be hampered by isobaric interferences. RIMS provides high sensitivity and selectivity for ultratrace analysis and isotope ratio measurements of Tc due to multi-step laser excitation and ionization in combination with a time-of-flight mass measurement.
The aim of this study was to apply RIMS for the analysis of 99gTc in environmental samples. For the determination of 99gTc in such samples, a known amount of 97Tc is added as a tracer. The isotope shift between 99Tc and 97Tc is known and both isotopes can be ionized simultaneously using a three-step ionization scheme. The application of the RIMS technique to a contaminated soil sample will be illustrated. Furthermore, isotope ratio measurements of 97/98/99Tc with RIMS and ICP-MS are presented.