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Carbon dating is used to determine the age of biological artifacts. Willard Libby developed radiocarbon dating as a method to measure radioactivity. Gas proportional counting is a conventional radiometric dating technique.
Radiometric dating. Geologists use radiometric dating to estimate how long ago rocks formed, and to infer the ages of fossils contained within those rocks. Absolute dating is used to determine a precise age of a fossil by using radiometric dating to measure the decay of isotopes, either within the fossil or more often.
The most important are Relative Dating, in which fossils and layers of rock are placed in order from older to younger, and Radiometric Dating, which allows the. Radiometric clocks are "set" when each rock forms. A commonly used radiometric dating technique relies on the breakdown of potassium.