Hafnium–tungsten dating
Geochronological radiometric dating method using radioactive decay of hafnium-182 / From Wikipedia, the free encyclopedia
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Hafnium–tungsten dating is a geochronological radiometric dating method utilizing the radioactive decay system of hafnium-182 to tungsten-182.[1] The half-life of the system is 8.9±0.1 million years.[1] Today hafnium-182 is an extinct radionuclide, but the hafnium–tungsten radioactive system is useful in studies of the early Solar system since hafnium is lithophilic while tungsten is moderately siderophilic,[2] which allows the system to be used to date the differentiation of a planet's core. It is also useful in determining the formation times of the parent bodies of iron meteorites.[3]
The use of the hafnium-tungsten system as a chronometer for the early Solar system was suggested in the 1980s,[4] but did not come into widespread use until the mid-1990s when the development of multi-collector inductively coupled plasma mass spectrometry enabled the use of samples with low concentrations of tungsten.[5][6]