How does radio active dating work

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If a sample has 6.25 % of the amount of Carbon 14 present in a living sample then four half lives have passed since the sample died and stopped absorbing Carbon. Carbon 14 has a limited of approximately 50,000 years or less.

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The Conversation UK receives funding from Hefce, Hefcw, SAGE, SFC, RCUK, The Nuffield Foundation, The Ogden Trust, The Royal Society, The Wellcome Trust, Esmée Fairbairn Foundation and The Alliance for Useful Evidence, as well as sixty five university members.­ ­You probably have seen or read news stories about fascinating ancient artifacts.At an ar­chaeological dig, a piece of wooden tool is unearthed and the archaeologist finds it to be 5,000 years old.In the case of living organisms, there is a constant ratio of Carbon-14 to Carbon-12 in the environement, and this is because carbon-14 is constantly created anew by cosmic radiation impacting on nitrogen-14 (I can imagine there might be variations to take into account as historic cosmic ratiation levels would vary).Once a living thing dies, it cannot take up any fresh carbon-14, so the carbon-14 that is contained within its body will decay, and will not be renewed.

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