Berlin 2014 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 9: Accelerator Mass Spectrometry and Applications 2

MS 9.4: Vortrag

Donnerstag, 20. März 2014, 15:00–15:15, DO24 1.205

Production of 41CaH2 samples for AMS measurements. Application to Interplanetary Dust Particles — •Jose Manuel Gomez Guzman, Shawn Bishop, Thomas Faestermann, Nicolai Famulok, Leticia Fimiani, Karin Hain, Stephan Jahn, Gunther Korschinek, and Peter Ludwig — TU Muenchen, Physik Department

Interplanetary Dust Particles (IDP) are small grains, generally less than a few hundred micrometers in size orbiting around the Sun. The most important source of IDP is the Asteroid Belt located at approximately 3 AU between Mars and Jupiter. During their flight from the Asteroid Belt to the Earth they are irradiated by SCR and GCR (solar and galactic cosmic rays) and 41Ca is formed. 41Ca (T1/2=1.03× 105 y) can be used as a unique tracer to determine the accretion rate of IDP on Earth because there are no significant terrestrial sources for this radionuclide.

The chemical production of 41Ca samples for AMS measurements can be made in two different ways: as fluoride or hydride, depending on the expected 41Ca/40Ca ratio in the samples. Since the very low expected 41Ca/40Ca ratios in IDP samples (in the order of 10−15), the chemical procedure to get 41CaH2 samples has been optimized at the Maier Leibnitz Laboratorium, presently the only AMS facility with sensitivity down to 10−16 for this radionuclide. First blank and standard measurements will be shown and the status of the AMS facility at MLL for the measurement of 41Ca will be presented.

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