The utility of the rubidium-strontium isotope system results from the fact that different minerals in a given geologic setting can have distinctly different Sr.
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For example measuring the ratio of stable and radioactive isotopes in meteorites can give us information on their history and provenance.
Radiometric dating techiques were pioneered by Bertram Boltwood in 1907, when he was the first to establish the age of rocks by measuring the decay products of the uranium to lead.
2.5 Ga yields an unweighted mean λRb decay constant is 2% lower than the currently accepted value.
► Our value of 1.394 ±0.004 ×10-11yr-1 agrees with the results of the most recent age comparisons and the latest beta counting experiment.
Rb half-life and decay constant, there is still no consensus on the absolute values.
Even the more accurate determinations of the last 30 years have resulted in discrepancies.
C is left undecayed at a given moment in time, one can work out how long ago the organism has died.