The University of Arizona
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The Keck Carbon Cycle AMS Laboratory, University of California, Irvine; initial operation and a background surprise.

John Southon, Guaciara Santos, Kevin Druffel-Rodriguez, Ellen Druffel, Sue Trumbore, Xiaomei Xu, Mazon Maya Mazo, Shahla Ali, Maya Mazon


A new radiocarbon accelerator mass spectrometry (AMS) laboratory for carbon cycle studies has been established at the University of California, Irvine. The 0.5MV AMS system was installed in mid-2002 and has operated routinely since October of that year. This paper briefly describes the spectrometer and summarizes lessons learned during the first year of operation. In the process of setting up the system, we identified and largely suppressed a previously unreported (super 14) C AMS background: charge exchange tails from (super 14) N beams derived from nitrogen-containing molecular ions produced near the entrance of the accelerator.


academic institutions;accelerator mass spectroscopy;accuracy ;C 13 C 12;C 14;California ;carbon ;graphitization ;instruments ;ions ;Irvine California;isotope ratios;isotopes ;Keck Carbon Cycle Accelerator Mass Spectrometry Laboratory;mass spectroscopy;measurement ;metals ;N 14;precision ;radioactive isotopes;sample preparation;spectroscopy ;stable isotopes;United States;University of California;zinc

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