radiocarbon dating

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Related to Radiocarbon year: carbon dating, radiocarbon dating

radiocarbon dating

n.
A form of radiometric dating used to determine the age of organic remains in ancient objects, such as archaeological specimens, on the basis of the half-life of carbon-14 and a comparison between the ratio of carbon-12 to carbon-14 in a sample of the remains to the known ratio in living organisms. Also called carbon dating, carbon-14 dating.

radiocarbon dating

n
(Archaeology) a technique for determining the age of organic materials, such as wood, based on their content of the radioisotope 14C acquired from the atmosphere when they formed part of a living plant. The 14C decays to the nitrogen isotope 14N with a half-life of 5730 years. Measurement of the amount of radioactive carbon remaining in the material thus gives an estimate of its age. Also called: carbon-14 dating

radiocar′bon dat`ing


n.
determination of the age of objects of organic origin by measurement of their radiocarbon content.
[1950–55]

radiocarbon dating

A technique for measuring the age of organic remains based on the rate of decay of carbon 14. The carbon 14 present in an organism at the time of its death decays at a steady rate, and so the age of the remains can be calculated from the amount of carbon 14 that is left.
Did You Know? The cells of all living things contain carbon atoms that they take in from their environment. Back in the 1940s, the American chemist Willard Libby used this fact to determine the ages of organisms long dead. Most carbon atoms have six protons and six neutrons in their nuclei and are called carbon 12. Carbon 12 is very stable. But a tiny percentage of carbon is made of carbon 14, or radiocarbon, which has six protons and eight neutrons and is not stable: half of any sample of it decays into other atoms after 5,700 years. Carbon 14 is continually being created in the Earth's atmosphere by the interaction of nitrogen and gamma rays from outer space. Since atmospheric carbon 14 arises at about the same rate that the atom decays, the Earth's levels of carbon 14 have remained constant. In living organisms, which are always taking in carbon, the levels of carbon 14 likewise stay constant. But in a dead organism, no new carbon is coming in, and its carbon 14 gradually begins to decay. So by measuring carbon 14 levels in an organism that died long ago, researchers can figure out when it died. The procedure of radiocarbon dating can be used for remains that are up to 50,000 years old.

radiocarbon dating

1. carbon dating
2. Radiometric dating based on the decay of the isotope carbon-14. It is used to date organic materials less than 70,000 years old.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.radiocarbon dating - a chemical analysis used to determine the age of organic materials based on their content of the radioisotope carbon-14; believed to be reliable up to 40,000 years
dating, geological dating - use of chemical analysis to estimate the age of geological specimens
Translations
Radiokohlenstoffdatierung

radiocarbon dating

nprova del carbonio 14
References in periodicals archive ?
A woodrat (Neotoma) midden in a crevice above the entrance was radiocarbon dated at 13,060 [+ or -] 280 radiocarbon years before present (Van Devender et al.
They have been confidently dated to 13,500 radiocarbon years before present.
Scientists now refer to radiocarbon years as "before present" (BP), where present means 1950.
Uncalibrated radiocarbon years before present (1950).
This, combined with the presentation of all dates in the volume in uncalibrated and uncorrected radiocarbon years (as is still common practice for many Andean archaeologists), demonstrates that some of the basic archaeological questions of chronology, which North American prehistorians take for granted, are still to be worked out in many regions of the world.
The expected standard uncertainty would be equivalent to approximately 120 radiocarbon years ([43], Eq.
Carbon dating of charcoal found at the site indicates the presence of humans there 10,430 radiocarbon years ago - a figure that equates to about 12,000 calendar years ago, near the end of the last ice age.
Some Ohio Hopewell specialists have justified their use of artifact styles and earthwork forms to infer time, rather than employ chronometric dates, because radiocarbon years are not equal to calendar years.
The dates are uncalibrated in radiocarbon years BP (Before Present AD 1950) using the half life of 5568 years.
As a result of variations in the production of carbon-14 in the atmosphere through time, radiocarbon years have a certain percentage of error, depending on age and type of material.