Suppose C (t) is the amount of carbon-14 present at. Carbon Dating Carbon-14 dating assumes that the carbon dioxide on Earth. A plot of the specific activity of 14C versus age for a number of archaeological samples shows an inverse linear relationship between 14C content (a log scale) and age (a linear scale). The radioactive isotope carbon-14 is present in small quantities in all life forms, and it is constantly replenished until the organism dies, after which it decays to stable carbon-12 at a rate proportional to the amount of carbon-14 present, with a half-life of 5571 years. Radioactive Decay Radioactive radium has a half-life of approximately 1599 years.
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