A gas ion source for radiocarbon measurements at 200 kV

Ruff, Matthias; Wacker, Lukas; Gäggeler, Heinz; Suter, Martin; Synal, Hans-Arno; Szidat, Sönke (2007). A gas ion source for radiocarbon measurements at 200 kV. Radiocarbon, 49(2), pp. 307-314. Tucson, Ariz.: Arizona Board of Regents, University of Arizona

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The novel tabletop miniaturized radiocarbon dating system (MICADAS) at ETH Zurich features a hybrid Cs sputter negative ion source for the measurement of solid graphite and gaseous CO2 samples. The source produces stable currents of up to 6 mu A C- out of gaseous samples with an efficiency of 3-6%. A gas feeding system has been set up that enables constant dosing of CO2 into the Cs sputter ion source and ensures stable measuring conditions. The system is based on a syringe in which CO2 gas is mixed with He and then pressed continuously into the ion source at a constant flow rate. Minimized volumes allow feeding samples of 3-30 mu g carbon quantitatively into the ion source. In order to test the performance of the system, several standards and blanks have successfully been measured. The ratios of C-14/C-12 could be repeated within statistical errors to better than 1.0% and the C-13/C-12 ratios to better than 0.2%. The blank was < 1 pMC.

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