Sm nd dating method

In order for the predicted ages to be accurate, however, scientists need sensitive methods for determining the necessary concentrations and ratios, and although several such methods have been developed, there is still room for improvement.Now, by combining various forms of chromatography, including cation-exchange chromatography, with two different forms of mass spectrometry, two Japanese scientists have created perhaps the most sensitive method yet developed for conducting Sm-Nd dating. The determinations since 1960 have converged on close agreement between the two primary determination techniques used in direct physical counting experiments—ionization chambers and liquid scintillation counters, and with radioisotope age comparisons using two meteorites.Thus the Sm half-life value of 106 ± 0.8 Byr has now been adopted for standard use by the uniformitarian geological community.

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Except in very specific environments, Nd will not be as useful as Sr (due to its higher concentration in natural waters) in the interpretation of the weathering process in rocks and minerals.

Sr will be higher in older crustal rocks and lower in younger rocks.

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