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    Carbon dating or radiocarbon

    For radiocarbon dating to be possible, the material must once have been part of a living organism.

    This means that things like stone, metal and pottery cannot usually be directly dated by this means unless there is some organic material embedded or left as a residue.

    Radiocarbon decays slowly in a living organism, and the amount lost is continually replenished as long as the organism takes in air or food.

    Radiocarbon dating has been one of the most significant discoveries in 20th century science.

    Organisms at the base of the food chain that photosynthesize – for example, plants and algae – use the carbon in Earth’s atmosphere.

    They have the same ratio of carbon-14 to carbon-12 as the atmosphere, and this same ratio is then carried up the food chain all the way to apex predators, like sharks.

    The radiocarbon method was developed by a team of scientists led by the late Professor Willard F.

    Libby of the University of Chicago in immediate post-WW2 years.

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