Sm nd isotopic dating

The uncertainties associated with most direct half-life determinations are, in most cases, still at the 1% level, which is still significantly better than any radioisotope method for determining the ages of rock formations.

On the other hand, it could be argued that this discarding of data points which do not fit the isochron is arbitrary and therefore is not good science, because it is merely assumed the “aberrant” values are due to contamination rather than that being proven to be so.In any case, the determined half-life of Sm has been shown to be dependent on the thicknesses of the Sm counting source and the detector.There is also evidence decay rates of the radioisotopes used for rock dating have not been constant in the past.Many in both the scientific community and the general public around the world thus remain convinced of the earth’s claimed great antiquity.However, accurate radioisotopic age determinations require that the decay constants of the respective parent radionuclides be accurately known and constant in time.

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This was achieved by using four standard Sm solutions with internal α-radioactive standards in 19 alpha spectrometer and 24 ionization chamber determinations, making it the most thorough and comprehensive effort to determine the Sm half-life.

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