carbon-14


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carbon-14 (14C)

a beta-emitter with a half-life of about 5700 years. It occurs naturally, arising from cosmic rays, and is used as a tracer in studying various aspects of metabolism and in dating relics that contain natural carbonaceous materials. Compare carbon-11.

carbon-14

A natural beta-emitting radioisotope of carbon that has a T1/2 of 5720 years, which decays to 14N. It has been used as a biotracer and in anthropology for dating carbon-rich materials, especially newer fossils, and can determine the age of carbon-based materials up to 60,000 years old.

carbon-14

14C
A radioactive isotope of carbon with a half-life of 5600 years; mass number 14; atomic mass (weight) 14. It is used as a tracer in metabolic studies and in archaeology to date materials containing carbon.

carbon-14

see CARBON DATING.
References in periodicals archive ?
CURVES AND NUMBERS Even in the early days, Libby suspected that the carbon-12 to carbon-14 ratio had not remained constant through time.
The changes in atmospheric carbon-14 can be constantly reflected in the human body because we eat plants - and animals fed with plants - that absorb carbon-14 from the atmosphere.
This may not sound much, but in relation to background concentrations of carbon-14, the difference is huge.
Deeper waters substantially depleted in carbon-14 were drawn to the upper layers and this is the main source of the CO2 during deglaciation," said Guilderson.
Methane exists in low concentrations in this air and only a trillionth of any given amount contains the carbon-14 isotope that the researchers needed to perform the analysis.
Miller's team also used carbon-14 dating and a similar technique that relies on the radioactive decay of uranium atoms.
The samples of the shards have been sent to Oxford University for carbon-14 dating, he added.
The radiation released by early, aboveground nuclear tests harmed people living in the shadow of the mushroom clouds but provided oceanographers with a research opportunity Radioactive carbon-14 atoms that fell into the ocean from the tests, which ended in 1964, provide a way to track water currents.
The study would require the use of carbon-14, a radioactive isotope used to trace the age of an artifact, to examine the coffin and its colors.
Monitoring of radionuclide content in agroecosystem components, agricultural production and ichthyofauna, Meteorological regime observations and calculations of meteorological parameters of the site of the Belarusian NPP, monitoring of the content of radionuclides of tritium and carbon-14 in surface atmospheric air.
Summary: Carbon-14 analysis of samples proved site dates back to 3100 BC
The analysis of carbon-14 dating on the excavated samples reveal that the sites belong to 3100 BC (Hafeet period).