In 1946, Willard Libby (1908–1980) developed a method for dating organic materials by measuring their content of carbon-14, a radioactive isotope of carbon.

Who developed radiocarbon dating in 1949?

Willard Libby When an organism dies and the supply of carbon from the atmosphere ceases, the content of carbon-14 declines through radioactive decay at a fixed rate. In 1949 Willard Libby developed a method for applying this to determine the age of fossils and archeological relics.