Accurate radiometric dating generally requires that the parent has a long enough half-life that it will be present in significant amounts at the time of measurement except as described below under "Dating with short-lived extinct radionuclides"the half-life of the parent is accurately known, and enough of the daughter product is produced to be accurately measured and distinguished from the initial amount of the daughter present in the material.
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Marine plants are similar to C3 plants, but they obtain their carbon from dissolved oceanic bicarbonates that differ from the atmosphere in their isotope ratios, and this difference is passed up the marine food chain.
Plants and animals assimilate carbon 14 from carbon dioxide throughout their lifetimes.
Description: The stable isotopes are carbon 12 and carbon While the moment in time at which a particular nucleus decays is unpredictable, a collection of atoms of a radioactive nuclide decays exponentially at a rate described by a parameter known as the half-lifeusually given in units of years when discussing dating techniques.