Abstract
Counting atoms rather than decays is much more efficient for the detection of long-lived radionuclides, especially at low concentrations. For example, the 14C content of 1 mg organic carbon (6 × 10 7 14C atoms, t 1 2 = 5730 yr ) results in only one decay per hour, whereas in the same time 1% of all 14C atoms can be counted with AMS.
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