carbon dating

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carbon dating

A radiometric dating method for determining the age of life forms which have died in the relatively recent past, having a limit of accuracy of about 60,000 years. Carbon dating is the result of cosmic radiation which bombards the Earth’s atmosphere, which constantly produces more 14C isotopes from 14N.

carbon dating

the dating of organic remains by measuring the radioactive carbon content. Atmospheric carbon dioxide contains carbon atoms of two types, ordinary carbon 12C and radioactive carbon 14C. Like other radioactive isotopes, 14C decays with age, so that the proportion of radioactive carbon present in, say, peat gives an indication of its age, assuming no more 14C has been incorporated in it since it was a live plant, and also that the amount of 14C in the atmosphere has remained constant. 14C has a HALF-LIFE of 5,570 years and one carbon atom in every million million in the atmosphere is radioactive. Dating organic remains by the use of 14C is a well-used and valuable technique, but not entirely accurate due to variations in atmospheric 14C over long periods of time. Comparisons with tree ring dates (see DENDROCHRONOLOGY have shown errors in the order of 900 years in 5,000.
References in periodicals archive ?
From carbon-14 dating of the sediment core layers, Bond pinpointed the ages of the peak coolings to 1,050, 3,050, 3,950, 5,650, and 8,050 years ago, with each cold spell lasting about 800 years.
Using the carbon-14 dating technique, Stute and his colleagues determined an age for each water sample.
The scientists, from the University of Pisa and the University of Milan, used carbon-14 dating to determine the age of ancient Adelie bones, feathers, eggs, and guano.
In the April 30 SCIENCE, Stanley and Warne reported that carbon-14 dating technique suggested that various parts of the delta were sinking 1 to 5 centimeters per decade.
Carbon-14 dating of organic material on the terrace indicates that the uplift occurred between 500 and 1,700 years ago.
Using the carbon-14 dating technique, the Alaskan researchers determined the ages of individual debris layers piled one atop the other.
Using the carbon-14 dating technique, Clarke and Carver found evidence of three earthquakes on such faults within the last 1,700 years.
Carbon-14 dating suggests that the shocks occurred every 300 years or so, with the last earthquake dating to approximately 1700.
Preliminary carbon-14 dating suggests that the coral-like Gerardia specimen -- retrieved from the Atlantic at a depth of 600 meters -- may have lived for as long as 1,700 years, researchers reported last week at the International Radiocarbon Conference in Tucson, Ariz.
Studies of Barbados coral revealed large errors in the carbon-14 dating scale used to measure the age of geologic and archaeological finds (137: 356).
Since then, he and his colleagues have traced the quake evidence farther down the coast and have used carbon-14 dating to establish the timing of those events.
Now, carbon-14 dating indicates the oil is extremely young, Simoneit and Didyk report in the Nov.