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.

Which method is used to directly date organic materials?

Radiocarbon dating Radiocarbon dating (also referred to as carbon dating or carbon-14 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.