Section V. Applications: (a). Archaeology and geology
Accelerator mass spectrometry of 36Cl in limestone and some paleontological samples using completely stripped ions

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Abstract

Using the MP tandem—postaccelerator combination at the Munich Accelerator Laboratory, 36Cl atoms extracted from various natural samples were accelerated to an energy so high that 7% of them were stripped of all their 17 electrons. This made it possible to use the isobar 36S in macroscopic quantities as a guide beam to stabilize the whole system while still preserving perfect separation of 36Cl and 36S at the final stage. We now attain a detection sensitivity of up to 4 × 10−15 for 36Cl in natural chlorine. In the first experiments, the 36Cl abundances of paleontological samples and the cosmic ray induced 36Cl contents in limestone as a function of depth have been determined.

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