A method is discussed for using the Berkeley 88-Inch Cyclotron as a mass sectrometer for all atomic masses. Low background radiation permits the detection of trace elements with a sensit\vity of 1 part in lQS to 10 17 a mass accuracy of 6m/m = 5.8 x lo-5, and an abundance accuracy of a few percent. These results are based in part on mass scans using an ion source containing rare earth ores.
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