Other
Scientific paper
May 1963
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1963gecoa..27..525c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 27, Issue 5, pp.525-546
Other
19
Scientific paper
An investigation has been made of factors contributing to the spread of 5 per cent which exists in interlaboratory comparisons of the potassium content of materials used for K-Ar age determinations. It has been found for flame photometric determinations that the interference of other ions present in the solutions obtained depends markedly on the burner used, on the fuel, and also on the actual potassium concentration. Flame photometric figures are compared with those obtained by isotope dilution in the same laboratory and show satisfactory agreement. As a further check a comparison is made of the ages determined on several minerals, including pyroxenes, extracted from the same rock. Potassium analyses are reported for several N.B.S., and other, interlaboratory standards. Recommendations for procedures to eliminate interferences found in the more common materials analysed for dating purposes are set out in an appendix.
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