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Radiocarbon dating is normally suitable for organic materials less than 50 000 years old because beyond that time the amount of 14C becomes too small to be accurately measured.

This scheme was developed in 1937 but became more useful when mass spectrometers were improved in the late 1950s and early 1960s.

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The amount of carbon isotopes within living organisms reaches an equilibrium value, on death no more is taken up, and the 14C present starts to decay at a known rate.

For an element to be useful for geochronology (measuring geological time), the isotope must be reasonably abundant and produce daughter isotopes at a good rate.

This technique uses the same minerals and rocks as for K-Ar dating but restricts measurements to the argon isotopic system which is not so affected by metamorphic and alteration events.

The decay of 147Sm to 143Nd for dating rocks began in the mid-1970s and was widespread by the early 1980s.

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