Define radiogenic dating

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Because the radioactive half-life of a given radioisotope is not affected by temperature, physical or chemical state, or any other influence of the environment outside the nucleus save direct particle interactions with the nucleus, then radioactive samples continue to decay at a predictable rate and can be used as a clock. This makes several types of radioactive dating feasible. For geologic dating, where the time span is on the order of the age of the earth and the methods use the clocks in the rocks , there are two main uncertainties in the dating process:. Starting with the simplest case where there are no daughter atoms present and no mass is lost from the sample, the age can be determined by measuring the relative amounts of the isotopes. This can be done by chemical means, but for precise determinations, mass spectrometry can be used.
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A radiogenic nuclide is a nuclide that is produced by a process of radioactive decay. It may itself be radioactive a radionuclide or stable a stable nuclide. Radiogenic nuclides more commonly referred to as radiogenic isotopes form some of the most important tools in geology. They are used in two principal ways:. Some naturally occurring isotopes are entirely radiogenic, but all these are isotopes that are radioactive, with half-lives too short to occur primordially. Thus, they are only present as radiogenic daughters of either ongoing decay processes, or else cosmogenic cosmic ray induced processes that produce them in nature freshly.
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Pairs of isotopes used in radiometric dating include potassium—40 which decays to argon—40 with a half-life of 1. Related to radiometric dating: Carbon 14 dating. Assuming that the parent radioisotope was present at the time of formation of the rock, etc. Half-lives must therefore be known with great accuracy for precise dating and should range from about 10 5 to about 10 10 years. The decay of radioisotopes can be used not only to date material but also to time very slow processes, such as the evolution of the Earth's atmosphere.
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Radiometric dating , radioactive dating or radioisotope dating is a technique which is 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. Together with stratigraphic principles , radiometric dating methods are used in geochronology to establish the geologic time scale. By allowing the establishment of geological timescales, it provides a significant source of information about the ages of fossils and the deduced rates of evolutionary change. Radiometric dating is also used to date archaeological materials, including ancient artifacts.
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