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Any scientific study of the past, including the geologic past, relies on the use of dating methods to determine the age of sites, landforms, sediments or geologic events.A variety of dating methods are available, and the scientist must decide which method will provide the most accurate results in each case.Relative dating methods were the first dating techniques to be developed, and are still widely used.The radiocarbon dating method was developed in the late 1940's by Dr. Libby, who later won a Nobel Prize in chemistry for this work.As a result, there is a changing ratio of carbon-14 to the more atomically stable carbon-12 involves actually counting individual carbon-14 atoms.This allows the dating of much older and smaller samples but at a far higher cost.

Since scans are not currently available to screen readers, please contact JSTOR User Support for access. When Rutherford announced his findings it soon became clear that Earth is millions of years old.These scientists and many more after them discovered that atoms of uranium, radium and several other radioactive materials are unstable and disintegrate spontaneously and consistently forming atoms of different elements and emitting radiation, a form of energy in the process.Radiocarbon dating is based on the fact that a radioactive isotope of carbon( Potassium argon dating is an absolute dating technique that can be used on volcanic rocks.Radioactive potassium (40potassium) decays into argon over time, so the age of certain rocks or minerals can be discovered by measuring the amount of argon they contain.Although, organic materials as old as 100,000 years potentially can be dated with AMS, dates older than 60,000 years are still rare.