Abstract
The Accelerator Mass Spectrometer (AMS) at the University of Arizona, built by General Ionex on the Cockcroft‐Walton principle, is reported by Paul Damon to be operating routinely and well at 1.8 MeV. Radiocarbon ages that match or exceed the best underground beta counting facilities are reportedly being produced. Reproducibility is reported to be 1%, a value Damon feels can be improved as they get more experienced in preparing and mounting samples. A second machine at the University of Toronto—built after the initial University of Arizona instrument—is rumored to be operating at 2.5 MeV and Damon is now checking this out. At Arizona they will now convert to trying chlorine‐36. The price of the General Ionex machines has risen to about $1.4 million.
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