An isotopic signature refers to the distinct ratios of different isotopes of an element found in a sample. Isotopes are variations of an element that have the same number of protons but different numbers of neutrons, resulting in differing atomic masses. For example, carbon has stable isotopes such as Carbon-12 (^12C) and Carbon-13 (^13C), while its radioactive isotope is Carbon-14 (^14C).
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