These visit web page can be applied with a sample as small as a milligram.
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As yet, the system has been used to produce graphite targets from plant macrofossils, charcoal, peat, bones, shells and pollen extracts.
Due to the very small sample amount, considerable effort is put into avoiding contamination with either modern or inactive carbon during the sample preparation.
Fe-C powder is pressed into a tablet which is used as a target in the sputter ion source of the accelerator.
The target is stored in argon atmosphere until the measurement.
Results are calculated using the Libby half-life and are given in the B.Low energy AMS spectrometer (called Tandy) at ETH Zurich, Switzerland or their 6MV machine.You may also take the "AMS Instrument Tour" (2.5MV AMS spectrometer) presented by Woods Hole Oceanographic Institution, Massachusetts, USA. Directly before the graphitisation the iron is oxidized and reduced in order to increase its catalytic properties.Then COO is produced and continuously removed by freezing out in a mixture of dry ice and alcohol.