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    Carbon dating explained

    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 dating is one of the most widely used scientific dating methods in archaeology and environmental science.

    It can be applied to most organic materials and spans dates from a few hundred years ago right back to about 50,000 years ago - about when modern humans were first entering Europe.

    date of organic material - but an approximate age, usually within a range of a few years either way.

    The other method is “Relative Dating” which gives an order of events without giving an exact age (1): typically artefact typology or the study of the sequence of the evolution of fossils.

    Radiocarbon dating may only be used on organic materials.

    In 1979, Desmond Clark said of the method “we would still be foundering in a sea of imprecisions sometime bred of inspired guesswork but more often of imaginative speculation” (3).

    Ever wondered how scientists know the age of old bones in an ancient site or how old a scrap of linen is?

    The technique used is called carbon dating and in this lesson we will learn what this is and how it is used. Carbon dating, or radiocarbon dating, is a method used to date materials that once exchanged carbon dioxide with the atmosphere. In the late 1940s, an American physical chemist named Willard Libby first developed a method to measure radioactivity of carbon-14, a radioactive isotope.

    Common materials for radiocarbon dating are: The radiocarbon formed in the upper atmosphere is mostly in the form of carbon dioxide. Because the carbon present in a plant comes from the atmosphere in this way, the radio of radiocarbon to stable carbon in the plant is virtually the same as that in the atmosphere.

    Plant eating animals (herbivores and omnivores) get their carbon by eating plants.

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