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What is Radiometric Dating?
Radioactive decay[ edit ] Example of a radioactive decay chain from lead Pb to lead Pb. The final decay product, lead Pb , is stable and can no longer undergo spontaneous radioactive decay. All ordinary matter is made up of combinations of chemical elements , each with its own atomic number , indicating the number of protons in the atomic nucleus. Additionally, elements may exist in different isotopes , with each isotope of an element differing in the number of neutrons in the nucleus. A particular isotope of a particular element is called a nuclide. Some nuclides are inherently unstable. That is, at some point in time, an atom of such a nuclide will undergo radioactive decay and spontaneously transform into a different nuclide. This transformation may be accomplished in a number of different ways, including alpha decay emission of alpha particles and beta decay electron emission, positron emission, or electron capture. Another possibility is spontaneous fission into two or more nuclides. While the moment in time at which a particular nucleus decays is unpredictable, a collection of atoms of a radioactive nuclide decays exponentially at a rate described by a parameter known as the half-life , usually given in units of years when discussing dating techniques.
Here are all the possible meanings and translations of the word radiometric dating. Radiometric dating Radiometric dating or radioactive dating is a technique used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed. The method compares the abundance of a naturally occurring radioactive isotope within the material to the abundance of its decay products, which form at a known constant rate of decay. The use of radiometric dating was first published in by Bertram Boltwood and is now the principal source of information about the absolute age of rocks and other geological features, including the age of fossilized life forms or the age of the Earth itself, and can also be used to date a wide range of natural and man-made materials. Together with stratigraphic principles, radiometric dating methods are used in geochronology to establish the geologic time scale.
Radiometric dating involves quantifying the amount of carbon present by measuring the emitted beta particles from its radioactive decay. Gas proportional counting involves converting samples to CO2 gas followed by detection and counting of the beta particles. Liquid scintillation counting involves converting the sample into a carbon-rich liquid, which is then added to a scintillator.
Dating Using Radioactive Decay Radiometric dating is used to date materials using the decay rate of a radioactive isotope. Radiometric dating, often called radioactive dating, is a technique used to determine the age of materials such as rocks. The best-known radiometric dating techniques include radiocarbon dating, potassium-argon dating, and uranium-lead dating.