Köln 2025 – scientific programme

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MS: Fachverband Massenspektrometrie

MS 8: Accelerator Mass Spectrometry I

MS 8.2: Talk

Thursday, March 13, 2025, 16:15–16:30, HS 2 Chemie

Sample size series for CO₂ measurements with an EA-IRMS-GIS-AMS system at CologeAMS — •Martina Gwozdz¹, Stefan Heinze¹, Janet Rethemeyer², Markus Schiffer¹, and Dennis Mücher¹ — ¹University of Cologne, Institute for Nuclear Physics, Cologne, Germany — ²University of Cologne, Institute for Geology and Mineralogy, Cologne, Germany

CO₂ sample materials such as soil samples or wood samples measured with AMS can be very versatile and often only little material is available. At CologneAMS we want to measure precise ¹⁴C data in the ranges of approximately 5-100 µg of carbon. Most importantly, ultra-small samples containing approximately 2-20µg of carbon, need to be measured reliably and with a constantly low background. At CologneAMS we established a connection between an elemental analyser (EA), an isotope ratio mass spectrometer (IRMS) and the 6MV AMS system of CologneAMS as well as an existing gas interface (GIS) to measure these small CO2 samples. This setup provides a fully automated, online-analysis of ¹⁴C/¹²C, and it delivers precise values for δ¹³C. We will present the first CO₂ sample size series of Ox-II standard measured with this system. Additionally, with the collaboration of the Dendrochronology laboratory in Cologne we want to use this system to establish a routine process for radiocarbon dating of pine trees, with the goal to improve dendrochronological archives in the ages of 13.000 years.

Keywords: AMS; EA; IRMS; Dendrochronology