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The older a sample is, the less (the period of time after which half of a given sample will have decayed) is about 5,730 years, the oldest dates that can be reliably measured by this process date to around 50,000 years ago, although special preparation methods occasionally permit accurate analysis of older samples.The idea behind radiocarbon dating is straightforward, but years of work were required to develop the technique to the point where accurate dates could be obtained.Several factors affect radiocarbon test results, not all of which are easy to control objectively.For this reason, it’s preferable to date objects using multiple methods, rather than relying on one single test.By measuring the ratio of carbon-14 to stable carbon-12, scientists can then determine when the organism in question died.When Libby developed the radiocarbon dating technique, he validated the method by comparing measured carbon ratios (carbon-14/carbon-12) from artifacts of known age with predictions of the ratio expected by assuming the decay rate.Research has been ongoing since the 1960s to determine what the proportion of in the atmosphere has been over the past fifty thousand years.

Regardless of the particular 14C technique used, the value of this tool for archaeology has clearly been appreciated.The same applies to marine organisms, although with some well-understood subtleties.After the organism dies, the carbon-14 decays in a predictable way.In the presentation speech for the 1960 Nobel Prize in Chemistry, one scientist described the work by honoree Willard Libby with these words: “Seldom has a single discovery in chemistry had such an impact on the thinking of so many fields of human endeavour.Seldom has a single discovery generated such wide public interest.” Libby’s research demonstrated the usefulness of carbon-14 in dating samples thousands of years old.

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