Correcting for isotopic fractionation, as is done for all radiocarbon dates to allow comparison between results from different parts of the biosphere, gives an apparent age of about 440 years for ocean surface water.
The radiocarbon dating method is based on the fact that radiocarbon is constantly being created in the atmosphere by the interaction of cosmic rays with atmospheric nitrogen.
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The ratio of λ is a constant that depends on the particular isotope; for a given isotope it is equal to the reciprocal of the mean-life – i.e.
The method was developed by Willard Libby in the late 1940s and soon became a standard tool for archaeologists.
Research has been ongoing since the 1960s to determine what the proportion of in the atmosphere has been over the past fifty thousand years.
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Histories of archaeology often refer to its impact as the "radiocarbon revolution".
fit=640,413" / FILE – At left, in a March 6, 2015, file photo, North Carolina coach Sylvia Hatchell shouts to her team during the second half of an NCAA college basketball game against Louisville in the quarterfinals of the Atlantic Coast Conference women’s tournament in Greensboro, N.
At right, in an April 5, 2016, file photo, Connecticut head coach Geno Auriemma yells from the sidelines during the second half of the championship game against Syracuse at the women’s Final Four in the NCAA college basketball tournament, in Indianapolis.