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    Brief history of carbon dating

    Archaeology and other human sciences use radiocarbon dating to prove or disprove theories.

    Over the years, carbon 14 dating has also found applications in geology, hydrology, geophysics, atmospheric science, oceanography, paleoclimatology, and even biomedicine.

    Free 5-day trial 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.

    Plants and animals assimilate carbon 14 from carbon dioxide throughout their lifetimes.

    When they die, they stop exchanging carbon with the biosphere and their carbon 14 content then starts to decrease at a rate determined by the law of radioactive decay.

    Carbon-14 has a half-life of 5,730 ± 40 years— during the succeeding 5,730 years.

    Because carbon-14 decays at this constant rate, an estimate of the date at which an organism died can be made by measuring the amount of its residual radiocarbon.

    It is rapidly oxidized in air to form carbon dioxide and enters the global carbon cycle.Libby was awarded the Nobel Prize in chemistry for his work in 1960.Carbon dioxide in the atmosphere contains a constant amount of carbon-14, and as long as an organism is living, the amount of carbon-14 inside it is the same as the atmosphere.As a member, you'll also get unlimited access to over 55,000 lessons in math, English, science, history, and more.Plus, get practice tests, quizzes, and personalized coaching to help you succeed.

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