Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A stable isotope of carbon, having six protons and six neutrons in the nucleus. Carbon-12 makes up most naturally occurring carbon.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun physics The most
abundant of the twostable isotopes ofcarbon , 126C, having sixprotons and sixneutrons ; it is the standard foratomic weight and is used to define themole .
Etymologies
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Examples
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Most of the carbon in the atmosphere’s carbon dioxide is carbon-12, which is not radioactive.
THE GREATEST SHOW ON EARTH RICHARD DAWKINS 2009
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Most of the carbon in the atmosphere’s carbon dioxide is carbon-12, which is not radioactive.
THE GREATEST SHOW ON EARTH RICHARD DAWKINS 2009
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And the ratio of carbon-12 to carbon-14 can be used to calculate the time that has elapsed since the death of the creature cut it off from the food chain and its interchange with the atmosphere.
THE GREATEST SHOW ON EARTH RICHARD DAWKINS 2009
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And the ratio of carbon-12 to carbon-14 can be used to calculate the time that has elapsed since the death of the creature cut it off from the food chain and its interchange with the atmosphere.
THE GREATEST SHOW ON EARTH RICHARD DAWKINS 2009
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Eventually it will be all carbon-12 – or, more strictly, the carbon-14 content will become too small to measure.
THE GREATEST SHOW ON EARTH RICHARD DAWKINS 2009
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The ratio of carbon-14 to carbon-12 in the specimen therefore gradually drops further and further below the standard ratio that living creatures share with the atmosphere.
THE GREATEST SHOW ON EARTH RICHARD DAWKINS 2009
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The strongest evidence comes from measurements of the isotopic signature of carbon dioxide -- the amount of carbon-12, -13, and -14 in the atmosphere.
David Roberts: Huffington Post Blows It With Recycled Climate Skeptic Nonsense 2009
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Eventually it will be all carbon-12 – or, more strictly, the carbon-14 content will become too small to measure.
THE GREATEST SHOW ON EARTH RICHARD DAWKINS 2009
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Alpha particles from the decay cause a release of neutrons from the beryllium as it turns to carbon-12.
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So plants take in carbon-14 alongside carbon-12, and incorporate the two kinds of carbon atom in sugars, in the same proportion as they exist in the atmosphere.
THE GREATEST SHOW ON EARTH RICHARD DAWKINS 2009
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