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He had assumed that amounts of Carbon-14 in the atmosphere had remained constant through time.

In fact, levels of Carbon-14 have varied in the atmosphere through time.

In 11,460 years, half of the 50% will remain, or 25%, and so on.

Limitations and calibration: When Libby was first determining radiocarbon dates, he found that before 1000 BC his dates were earlier than calendar dates.

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How It Works: Carbon has 3 isotopic forms: Carbon-12, Carbon-13, and Carbon-14.It is good for dating for the last 50,000 years to about 400 years ago and can create chronologies for areas that previously lacked calendars.In 1949, American chemist Willard Libby, who worked on the development of the atomic bomb, published the first set of radiocarbon dates.Historical documents and calendars can be used to find such absolute dates; however, when working in a site without such documents, it is hard for absolute dates to be determined.As long as there is organic material present, radiocarbon dating is a universal dating technique that can be applied anywhere in the world.

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