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 ?
The carbon 14 in the atmosphere is mirrored in bodies," Frisen says.
Now, Edouard Bard of the Center for Weak Radioactivity in Gif-sur-Yvette, France and his colleagues report they have used coral to calibrate the carbon 14 scale over the past 30,000 years, an advance one scientist describes as a "quantum leap.
Scientists from the Lawrence Livermore National Laboratory, the Karolinska Institute, Universite Claude Bernard Lyon, Lund University, and Lund University Hospital made these findings by using the amount of carbon 14 in the atmosphere from above-ground nuclear testing in the 1950s and 1960.
Using LLNL's Center for Accelerator Mass Spectrometry, Buchholz measured the amount of carbon 14 in DNA in beta cells and discovered that after age 30, the body does not create any new beta cells, thus decreasing the capacity to produce insulin as a person ages.
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.
Rigg's, Columbia, South Carolina * Carbon 14, Memphis, Tennessee * AMPM Inc.
It relies upon the fact that all living organisms absorb low levels of a radioactive isotope known as carbon 14, a heavy form of carbon which is present in low levels in the atmosphere.
Carbon 14 is a dynamic, creatively driven interactive communications agency based in Southern California.
The samples obtained at Cova Gran using Carbon 14 dating refer to a period of between 34,000 and 32,000 years in which this biological replacement in the Western Mediterranean can be located in time.
Radioactive materials covered by this class include Iodine 131 in both Sodium Iodide and Monoiodobenzene forms, Cobalt 60, Carbon 14 and others.