Look up: carbon-14

1. 
   carbon 14
   a radioactive isotope of carbon, having an atomic mass of 14 and a half-life of 5730 years, used as a tracer in cancer and metabolic research.
   Found on http://www.mercksource.com/pp/us/cns/cns
   
   
2. 
   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) ...
   Found on http://www.mondofacto.com/facts/dictiona
   
   
3. 
   Carbon-14
   `Carbon-14`, `14C`, or `radiocarbon`, is a radioactive isotope of carbon discovered on February 27, 1940, by Martin Kamen and Sam Ruben. Its nucleus contains 6 protons and 8 neutrons. Its presence in organic materials is used extensively as basis of the radiocarbon dating method to date archaeological, geological, and hydrogeological samples. There are three naturally occurring isotopes of carbon on Earth: 99% of the carbon is carbon-12, 1% is c...
   Found on http://en.wikipedia.org/wiki/Carbon-14
   
   
4. 
   carbon-14
   (from the article `carbon`) ...than all the other elements combined. In 1961 the isotope carbon-12 was selected to replace oxygen as the standard relative to which the atomic ... ...detection device. Iodine-131 has proved effective in locating brain tumours, measuring cardiac output, and determining liver and thyroid activity. ... .....
   Found on http://www.britannica.com/eb/a-z/c/22
   
   
5. 
   carbon-14
   A -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.
   Found on http://www.stedmans.com/section.cfm/45
   
   
6. 
   carbon-14
   A radioactive isotope of carbon with a half-life of 5,730 years. Carbon-14 can be used to find the age of formerly living things through a process known as radiocarbon dating. The principle behind this form of dating is as follows. It's known that a small amount of naturally-occurring carbon is car...
   Found on http://www.daviddarling.info/encyclopedi