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It is found in meteorites that condensed from the primordial solar system dust cloud and trapped promordial iodine-129 (half life 15.7 million years) some time in a relative short period (probably less than 20 million years) between the iodine-129's creation in a supernova, and the formation of the solar system by condensation of this dust.
The following table lists some of the most important radiogenic isotope systems used in geology, in order of decreasing half-life of the radioactive parent isotope.
The values given for half-life and decay constant are the current consensus values in the Isotope Geology community. Along with heat from the outer core of the Earth, radiogenic heating occurring in the mantle make up the two main sources of heat in the Earth's interior.
Radon is entirely radiogenic, since it has too short a half-life to occur primordially.
Helium, however, occurs in the crust of the Earth primordially, since both helium-3 and helium-4 are stable, and small amounts were trapped in the crust of the Earth as it formed.
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.
A few others are naturally produced by nucleogenic processes (natural nuclear reactions of other types, such as neutron absorption).
Together with stratigraphic principles, radiometric dating methods are used in geochronology to establish the geological time scale.
Among the best-known techniques are radiocarbon dating, potassium-argon dating and uranium-lead dating.
Different methods of radiometric dating vary in the timescale over which they are accurate and the materials to which they can be applied.
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.
A radiogenic nuclide is a nuclide that is produced by a process of radioactive decay.Tags: Adult Dating, affair dating, sex dating