Abstract
The measurement capabilities of the new accelerator mass spectrometry (AMS) system at the 10 MV FN tandem accelerator of CologneAMS has been extended with AMS measurements of 60Fe/Fe in the range of 10-8, 10-10 and 10-12. The measurements were conducted combining a 135° gas-filled magnet and a subsequent energy loss measurement in a 5 anode gas ionization chamber. This technique allows a good separation of the stable isobar 60Ni resulting in a suppression by a factor of 107 for the high energy mass spectrometer. With this a limit for the background level of 7·10-14 was achieved. The calculation of the error normalized sensitivity allowed a first comparison to other AMS laboratories.
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