| carbon-14 | A beta-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. (05 Mar 2000) |
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| carbon-14 | a chemical analysis used to determine the age of organic materials based on their content of the radioisotope carbon-14 |
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