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Radiocarbon dating can provide ages for materials less than 40,000 years old.Radiocarbon or 14C (pronounced "carbon fourteen") is a radioactive form of carbon. This means that an organism that died 5,700 years ago will have only one half of its original 14C.An example of the confusion this has caused is the date of a decisive battle that shaped the course of Mayan civilisation.It occurred at nine Bak'tuns, 13 K'atuns, three Tuns, seven Winals and 18 K'ins -- or 1,390,838 days from the start of the count.However, this assumption is not exactly true, so that radiocarbon ages become progressively too young with age; 5000 14C years is about 5700 calendar years, 11,000 14C years is about 13,000 calendar years, 20,000 14C years is almost 24,000 calendar years, and so on.A correction is possible based upon dating of tree-rings of known age and from paired radiocarbon and uranium-series dates of corals.The ensuing atomic interactions create a steady supply of c14 that rapidly diffuses throughout the atmosphere.

The time is counted from a mythical starting point. Spanish colonisers did their utmost to wipe out traces of the Mayan civilisation, destroying evidence that could have provided a clue.This discovery meant that there are three naturally occurring isotopes of carbon: Whereas carbon-12 and carbon-13 are stable isotopes, carbon-14 is unstable or radioactive.Carbon-14 is produced in the upper atmosphere when cosmic rays bombard nitrogen atoms.Nowadays, radiocarbon scientists had to perform calibration not only to convert their radiocarbon year results into calendar year but also to take into account the various factors that have major effects on the global levels of carbon 14, one of which is nuclear weapons testing.There are two human activities recognized to have irreparably changed the global radiocarbon levels—the burning of fossil fuel and nuclear weapons testing.

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