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Radiocarbon dating unreliable

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Is Carbon Dating Reliable?

It is an essential technology that is heavily involved in archaeology and should be explored in greater depth. Radiocarbon dating uses the naturally occurring isotope Carbon to approximate the age of organic materials. Often, archaeologists use graves and plant remains to date sites. Since its conception by Willard Libby in , it has been invaluable to the discipline. In fact, many important archaeological artifacts have been dated using this method including some of the Dead Sea Scrolls and the Shroud of Turin. Though radiocarbon dating is startlingly accurate for the most part, it has a few sizable flaws. The technology uses a series of mathematical calculations—the most recognizable of which is known as half-life—to estimate the age the organism stopped ingesting the isotope.

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What about radiocarbon dating? I asked several people who know about this field. Their responses are numbered below. C14 dating is very accurate for wood used up to about 4, years ago. This is only because it is well calibrated with objects of known age. This standard content of C14 can then be used for wood not associated with a historically documented date. Dates up to this point in history are well documented for C14 calibration.

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September 12, Print Email A team of German and Chinese researchers has made a claim that could spark major re-dating of organic material from more than 30, years ago. What the team suggests is that radiocarbon dating, which has long been the dominant method of dating organic matter up to 60, years old, becomes unreliable for specimens of over 30, years, in some cases highly unreliable. The paper is published in Earth and Planetary Science Letters. Radiocarbon dating, which was discovered for science as a method of dating ancient specimens of organic matter by US chemist Willard Libby, consists in measuring the levels of carbon, a radioactive isotope of the element that has a halflife of 5, years. All organic matter, while it lives, absorbs this isotope from its environment. Libby theorised that the amount of both non-radioactive and radioactive isotopes of carbon in an organism remain a constant throughout its life, and after this life ends, the absorption stops and carbon starts to decay.

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Radiocarbon Dating: A Closer Look At Its Main Flaws

Their recent analysis of sediment from the largest freshwater lake in northeast China showed that its carbon clock stopped ticking as early as 30, years ago, or nearly half as long as was hitherto thought. For instance, remnants of organic matter formerly held up as solid evidence of the most recent, large-scale global warming event some 40, years ago may actually date back far earlier to a previous ice age. Their work was detailed in a paper in the latest issue of the journal Earth and Planetary Science Letters.

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