Accelerator mass spectrometry with time-of-flight measurement
1990
Abstract A time-of-flight detection system for the measurement of microscopic concentrations of long-lived radioisotopes has been set up at the Munich MP tandem accelerator. The technique allows an unambiguous mass determination for heavy ions up to the actinides. As a first test of the system, the concentration of 129 I in iodine has been measured for several samples of mineral and biological origin. The smallest 129 I 127 I ratios measured were a few times 10 −13 . The high sensitivity of the method was achieved by using a 90° injector with a good mass resolution, a special technique of stabilizing the terminal voltage with an auxiliary beam, and a time-of-flight system with a mass resolution of 800.
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