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    Application of carbon 14 dating

    After plants die or are consumed by other organisms, the incorporation of all carbon isotopes, including 14C, stops.

    Thereafter, the concentration (fraction) of 14C declines at a fixed exponential rate due to the radioactive decay of 14C. ) Comparing the remaining 14C fraction of a sample to that expected from atmospheric 14C allows us to estimate the age of the sample.

    The Greeks consider the first Olympic Games as the beginning or 776 BC.

    The Muslims count the Prophet’s departure from Mecca, or the Hegira, as their beginning at AD 662.

    The carbon-14 isotope would vanish from Earth's atmosphere in less than a million years were it not for the constant influx of cosmic rays interacting with molecules of nitrogen (N) into organic compounds during photosynthesis, the resulting fraction of the isotope 14C in the plant tissue will match the fraction of the isotope in the atmosphere.

    Radiocarbon dating (usually referred to simply as carbon-14 dating) is a radiometric dating method.

    It uses the naturally occurring radioisotope carbon-14 (14C) to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years old.

    Carbon has two stable, nonradioactive isotopes: carbon-12 (12C) and carbon-13 (13C).

    There are also trace amounts of the unstable radioisotope carbon-14 (14C) on Earth.

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