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 ?
Radiocarbon records can be calibrated by measuring the amount of carbon-14 in materials of which the age is known.
Tree-ring segments from the Northern Hemisphere help with calibration, as do things like coral, because they accurately reflect carbon-14 levels in the atmosphere at certain time periods.
In his study, LLNL scientist Bruce Buchholz analyzed the uptake of carbon-14 in genomic DNA within fat cells to establish the dynamics of fat cell turnover.
The carbon-14 levels that Baumgardner claims to find in ancient coal and diamonds show significant variation from sample to sample, suggesting contamination.
The carbon-14 dating of some sites began to push back the origins of human settlement earlier than 12,000 BP.
The first successful investigation of Kirkwood's quest for the de novo origin of heterocyclic systems of alkaloids from carbon-14 labelled acyclic precursors was an experiment to test whether an N[C.
Carbon-14 dating from remains found at an Arica site, called Acha, estimates that the oldest Chinchorro "natural" mummy is from 7020 B.
When the cosmic rays come in, they make radiocarbon in the upper atmosphere, and that carbon-14 ends up in carbon dioxide molecules.
The selppointed chief inquisitor this time has been the astronomer Carl Sagan but in 1995, Charles Ginenthal demolished Sagan's specious arguments in his own comprehensive book, Carl Sagan & Immanuel Velikovsky, which is valuable and most readable for br inging in further wide-ranging data and detailing techniques - for example, carbon-14 dating which is so erratic it has been known to show the shells of living molluscs to have an age of 2300 years.
Ohara entered the university's gene experiment laboratory in Suita, Osaka Prefecture, western Japan, around the midnight of June 23 last year and stole containers of phosphorus-32 and carbon-14 and spread them on the facility's floor, the court said.
Carbon-14, an invaluable laboratory research isotope, has a half-life of 5,730 years.
ONGAR, England -- Selcia Limited, a leading independent provider of Carbon-14 (C-14) radiolabelling services, is pleased to announce that its radiochemistry facility has been granted a Good Manufacturing Practice (GMP) certificate for the preparation and C-14 labelling of Active Pharmaceutical Ingredients (APIs) for clinical trials following a successful inspection by the UK's Medicines and Healthcare products Regulatory Agency (MHRA).