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MS: Fachverband Massenspektrometrie
MS 4: Accelerator Mass Spectrometry (AMS) II
MS 4.4: Vortrag
Dienstag, 11. März 2008, 11:45–12:00, 3E
Fully automated radiocarbon AMS measurements with elemental analyser and gas ion source — •Matthias Ruff1,2, Heinz Gäggeler1,2, Martin Suter3,4, Hans-Arno Synal4, Sönke Szidat1, and Wacker Lukas3 — 1University of Berne, Switzerland — 2Paul Scherrer Institute, Switzerland — 3ETH Zurich, Switzerland — 4PSI/ETH Zurich, Switzerland
The MIACADAS gas ion source in Zurich for measuring radiocarbon in small samples in the range of 2 - 50 ug carbon is now routinely running semi-automated for more than one and a half years. So far the carbon dioxide to be measured is supplied in glass ampoules and released in an ampoule cracker. The gas is flushed into a syringe with helium and transported onto the surface of a titanium gas target in the Cs sputter ion source. Thereby, the syringe acts as an adjustable tool according to the sample size and can also be moved by a stepping motor to keep a constant flow into the source.
For full automation of this system an elemental analyser has been connected for combustion of the sample and separation of the combustion gases. The isolated carbon dioxide leaves the elemental analyser in a high helium stream of about 80 ml/min and has to be first concentrated on a small trap before feeding it into the syringe. Some technical solutions and first results of this automated online system will be discussed.