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Libby, a physical chemist, is best known for leading a team at the University of Chicago that developed a technology in the late 1940s—radiocarbon dating—that revolutionized how we understand the history of the earth and its living species.It has successfully determined the age of artifacts up to 50,000 years ago.Radiometric dating utilizes the decay rates of certain radioactive atoms to date rocks or artifacts.Uniformitarian geologists consider this form of dating strong evidence that the Earth is billions of years old.Libby was the son of a California farmer and attended college and graduate school at the University of California at Berkeley.In the 1930s, he was a chemistry instructor at Berkeley and a researcher with an ambitious group of radiochemists at the university’s Lawrence Radiation Laboratory. And the discoveries made during that time are still the main bulwark and substance of chemical nuclear chemistry,” Libby later recalled.

It uses the naturally occurring radioisotope carbon-14 (14C) to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years old. Carbon-14 has a relatively short half-life of 5,730 years, meaning that the fraction of carbon-14 in a sample is halved over the course of 5,730 years due to radioactive decay to nitrogen-14.The currently accepted value for the half-life of will remain; a quarter will remain after 11,460 years; an eighth after 17,190 years; and so on.The equation relating rate constant to half-life for first order kinetics is \[ k = \dfrac \label\] so the rate constant is then \[ k = \dfrac = 1.21 \times 10^ \text^ \label\] and Equation \(\ref\) can be rewritten as \[N_t= N_o e^ \label\] or \[t = \left(\dfrac \right) t_ = 8267 \ln \dfrac = 19035 \log_ \dfrac \;\;\; (\text) \label\] The sample is assumed to have originally had the same (rate of decay) of d/min.g (where d = disintegration).Once an organism is decoupled from these cycles (i.e., death), then the carbon-14 decays until essentially gone.The half-life of a radioactive isotope (usually denoted by \(t_\)) is a more familiar concept than \(k\) for radioactivity, so although Equation \(\ref\) is expressed in terms of \(k\), it is more usual to quote the value of \(t_\).




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