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MS: Fachverband Massenspektrometrie

MS 7: Accelerator Mass Spectrometry and Applications I

MS 7.2: Vortrag

Donnerstag, 15. März 2012, 11:00–11:15, V57.06

⁹³Zr measurements with Accelerator Mass Spectrometry using a passive absorber — •Karin Hain¹, Thomas Faestermann¹, Leticia Fimiani¹, Gunther Korschinek¹, Peter Ludwig¹, and Georg Rugel^1,2 — ¹Fakultät für Physik, Technische Universität München, D-85748, Garching, Germany — ²Forschungszentrum Dresden-Rossendorf, D-01314, Dresden, Germany

First test measurements for the detection of the long-living fission product ⁹³Zr (T_1/2=1.5·10⁶a) were performed at the Maier Leibnitz Laboratorium in Munich. For the suppression of the isobaric background due to ⁹³Nb, a passive absorber with a subsequent Time of Flight path and a multi-anode ionization chamber was used. From blank measurements a region of interest (ROI) for ⁹³Zr events could be calculated by linear interpolation between ⁹²Zr and ⁹⁴Zr events. The separation of this ROI from the background events at different experimental settings was compared. In this way Silicon Nitride foils with a total thickness of approximately 2.4 mg/cm² were determined as optimal passive absorber. An upper detection limit of ⁹³Zr/Zr=6·10⁻⁹ was obtained. In this talk, the method of isobar separation with the help of a passive absorber will be presented and the results of the measurements using a ZrO₂ blank sample will be discussed.