Radiocarbon dating is also simply called Carbon dating.
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All living organisms take up carbon from their environment including a small proportion of the radioactive isotope 14C formed from nitrogen as a result of cosmic ray bombardment.
For an element to be useful for geochronology measuring geological timethe isotope must be reasonably abundant and produce daughter isotopes at a good rate.
Do not confuse with the highly radioactive isotope, strontium
Description: In the case of St Severin, for example, we have 4 different natural clocks actually 5, for the Pb-Pb method involves 2 different radioactive uranium isotopeseach running at a different rate and each using elements that respond to chemical and physical conditions in much different ways. Precambrian Research.