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Potassium content was analyzed by flame photometry, using a lithium metaborate fusion technique in which the lithium seerves as an internal standard. Argon was extracted and analyzed by standard methods of isotope dilution and mass spectrometry.
Categories: Physical Item;
Tags: Age date
K analyzed by G. Edsall, Kristina Ahlnas, and Diane Duvall with a digital flame photometer (Instrumentataion Laboratories, model 343) using the LiBO2 flux fusion technique and mineral calibration standards. Ar analyzed and ages calculated by Donald Turner, Wilfred Davis and Diane Duval using isotopic dilution, using 38Ar tracers, and a mass spectrometer (152.4-cm radius) (Nuclide Corporation) equipped with automated peak stepping and a digital data-acquisition system.
Categories: Physical Item;
Tags: Age date
Duplicate potassium analyses were done with a Baird KY-2 flame photometer, using a lithium internal standard. Argon was analyzed by isotope dilution with a bulb argon-38 tracer and a Reynolds-type mass spectrometer.
Categories: Physical Item;
Tags: Age date
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