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American biochemists Martin Kamen and Sam Ruben discovered carbon-14, a radioactive isotope of carbon, which is now used extensively as the basis of the radiocarbon dating method to date archaeological and geological samples.
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Martin Kamen
American chemist (1913–2002)
Martin David Kamen was an American chemist who, together with Sam Ruben, co-discovered the synthesis of the isotope carbon-14 on February 27, 1940, at the University of California Radiation Laboratory, Berkeley. He also confirmed that all of the oxygen released in photosynthesis…Source: Wikipedia (CC BY-SA)
Sam Ruben
American chemist (1913–1943)
Samuel Ruben was an American chemist who with Martin Kamen co-discovered the synthesis of the isotope carbon-14 in 1940.Source: Wikipedia (CC BY-SA)
Carbon-14
Radiosotope of carbon
Carbon-14, C-14, 14C or radiocarbon, is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons. Its presence in organic matter is the basis of the radiocarbon dating method pioneered by Willard Libby and colleagues (1949) to date…Source: Wikipedia (CC BY-SA)
Radionuclide
Atom that has excess nuclear energy, making it unstable
A radionuclide is a nuclide that is unstable and known to undergo radioactive decay into a different nuclide, which may be another radionuclide or be stable. Radiation emitted by radionuclides is almost always ionizing radiation because it is energetic enough to liberate an…Source: Wikipedia (CC BY-SA)
Radiocarbon dating
Method of determining the age of objects
Radiocarbon dating is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon.Source: Wikipedia (CC BY-SA)