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A naturally occurring, radioactive carbon isotope with an atomic mass of 14 and a half-life of 5,730 years, used in determining the age of ancient organic, geologic, or archaeological specimens.
References in periodicals archive ?
Carbon dating works by measuring the amount of carbon-14 versus non-radioactive carbon (C) found in an object.
In the air, cosmic rays convert stable nitrogen-14 into radioactive carbon-14.
Carbon-14 decays away within about 60,000 years, so it is present only in material that came from living things, and not rocks.
The workshop also covered methods of nuclear analysis including fluorescent and particle-induced X-ray, using the electron microscope, neutron activation analysis, laser-induced breakdown spectroscopy, Carbon-14 radiocarbon dating, thermal radiation, and also nuclear magnetic resonance (NMR) spectroscopy.
It responds to recent discoveries in a variety of fields that the chemical species of an element (Carbon-13 vs Carbon-14, for instance) determines many factors about its bioavailability and toxicity.
The researchers used a powerful carbon-14 identification method to trace four-fifths of the black carbon emitted in China to incomplete combustion of fossil fuel such as coal briquettes used in home cook stoves and automobile and truck exhaust.
Atomic bomb testing in the 1960s caused a sharp spike in carbon-14 in all living things, from rhino horns to tree rings.
Paul Carlsson, a paleometagenomicist working to establish his own career after an abusive childhood at the hands of his scientist father, has never known a world that wasn't 5,800 years old--a figure that, according to his father, had been proven by carbon-14 dating and thus had borne out the biblical story in which men roamed the world with dinosaurs as Adam and Eve tended the Garden of Eden.
The technique compares the amount of carbon-14 (C-14), a less common form of atmospheric carbon, to carbon-12 (C-12), which is more stable and abundant.
Further authentication tests with Carbon-14 by the Radiocarbon Dating Laboratory of the University of Illinois Urbana-Champaign and the Department of Engineering of Innovation at the University of Salento confirmed the professor's conviction.
Travel Business Review-October 23, 2012--University of Groningen - New carbon-14 data provides a more accurate picture of prehistory(C)2012] ENPublishing - http://www.
Plants and animals absorb trace amounts of radioactive carbon-14 from carbon dioxide (CO2) in the atmosphere while they are alive but stop doing so when they die.