Abstract
Some potential applications of the isotopes 36Cl and 236U require higher sensitivity than is normally required or achieved. For 36Cl, one such application is the measurement of the 36Cl/Cl ratio of seawater. We show that, with appropriate precautions to reduce the effect of ion-source memory, it is possible to reach blank levels below 10−16 in the 36Cl/Cl ratio. Measurements of a series of seawater and sea salt samples yield a blank-corrected 36Cl/Cl ratio of present-day sea water of 0.71±0.08×10−15. For 236U, one potential application is as a prospecting tool, where sensitivities in the 236U/238U ratio at the 10−13 level are desirable. We demonstrate that this sensitivity can be achieved for 24MeV uranium ions with time-of-flight detection over a 6.0m flight path.
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