The argon -40/ argon -39 method for potassium-argon age determination

Details The argon -40/ argon -39 method for potassium-argon age determination The argon -40/ argon -39 method for potassium-argon age determination

Jul 1968

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968gecoa..32..781m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 32, Issue 7, pp.781-790

Physics

18

Scientific paper

In the argon -40/ argon -39 method of potassium-argon dating, the potassium analysis is performed by mass-spectrometric measurement of the 39 Ar in neutron irradiated minerals. Sources of interference with the ideal mechanism are investigated and with the exception of argon produced from isotopes of calcium, are shown to be negligible. It is demonstrated that for most materials used in potassium-argon dating this effect can be ignored. A demonstration of the method is given using samples of known potassium-argon ages. Some advantages over the conventional method are that the amount of material required is greatly reduced, no argon-38 "spike" is required and chemical inhomogeneity within a sample is of no consequence. Practical difficulties encountered are outlined.

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