carbon 14

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 (C) [kahr´bon]
a chemical element, atomic number 6, atomic weight 12.011. (See Appendix 6.)
carbon 11 a radioactive isotope of carbon, atomic mass 11, having a half-life of 20.39 minutes; used as a tracer in positron emission tomography.
carbon 14 a radioactive isotope of carbon, atomic mass 14, having a half-life of 5730 years; used as a tracer in cancer and metabolic research.

car·bon 14 (14C),

A β-emitter with a half-life of 5715 years, widely used as a tracer in studying various aspects of metabolism; naturally occurring 14C, arising from cosmic ray bombardment, is used to date relics containing natural carbonaceous materials.
References in periodicals archive ?
When cells divide, they can use some of the carbon 14 to build DNA, a phenomenon that serves as a birthmark for new cells.
For carbon 14, the ratio of parent to daughter is assumed to be known at the outset.
The excavations conducted in 1952 on Grande Terre, and in particular the dating of Site 13 of Lapita, are considered as the starting point of modern archaeological research in the southwestern Pacific, specially with the first use of the Carbon 14 dates.
Thus he is concerned to demonstrate the antiquity of the texts, which is confirmed by palaeographical studies and Carbon 14 dating, the most recent results of which he sets out in summary.
Opening remarks by David Buckland and Claire Sykes, co-curators of Carbon 14, and Dave Ireland, managing director, ROM Centre of Discovery in Biodiversity, will take place at 11 a.
The centre added that the pearl that was discovered lately in Umm Al Quwain goes back to 5500 BC after it was tested by Carbon 14.
Campaign group Community Concern petitioned the European Parliament about the high levels of nuclear waste, including tritium and carbon 14, found in the Severn Estuary and surrounding area which they believe will affect the health of people living in the city, despite being within Government limits.
Connelly, assistant professor of geological sciences at the university, and research scientist associate Kathryn Manser dated the carbonate samples using techniques roughly similar to Carbon 14 dating of artifacts by archaeologists.
Since the development of the carbon 14 dating method in the late 1940s, experts have recognized the technique does not work like a perfect clock.