Who invented the method of radiocarbon dating world single dating sites
Because the activity of the carbon atoms decreases at a known rate, it should be possible, by measuring the remaining activity, to determine the time elapsed since death, if this occurred during the period between approximatively 500 and 30,000 years ago.This hypothesis was published by Libby in 1947, and with his great experimental skill it did not take him long to prove the validity of the theory.The carbon-14 method is a complement to those methods, enabling more accurate determinations to be made.The carbon-14 method has also been applied in oceanography, for example, for the dating of relatively recent sea sediments.For all of these graves, the Egyptologists had been able to determine the time when they were built.Libby also checked his method by determining the age of heartwood from the trunks of redwood trees (Sequoia sempervirens), and of Douglas firs (Tsuga douglasii), which were several thousand years old and whose exact age could be determined by counting the annual rings.
Carbon-14 is a kind of carbon, an isotope of carbon with an atomic weight of 14, which is found in the carbon dioxide of the air.It is formed high up in the atmosphere by cosmic radiation coming from outer space. The newly formed carbon-14 has high energy at the moment of its formation, so that it rapidly oxidizes to carbon dioxide, which spreads out and distributes itself evenly in the atmosphere.The ratio of carbon-14 in the carbon dioxide of the atmosphere is very low.Professor Willard Libby has been selected to be the prize-winner for his method of age determination of materials of biological origin by use of carbon-14 as a measurer of time.His method has obtained widespread use and has become indispensable in archaeology, geology, geophysics and other sciences.
Westgren, Chairman of the Nobel Committee for Chemistry of the Royal Swedish Academy of Sciences Your Majesty, Your Royal Highnesses, Ladies and Gentlemen.