Argon isotope dating

19-Apr-2020 23:55

A precise amount of argon-38 is added to the gas as a "spike" to help calibrate the measurement, and the gas sample is collected onto activated charcoal cooled by liquid nitrogen.

Then the gas sample is cleaned of all unwanted gasses such as H A variant of the K-Ar method gives better data by making the overall measurement process simpler.

Potassium (K) is one of the most abundant elements in the Earth's crust (2.4% by mass).

For every 100 K-40 atoms that decay, 11 become Ar-40.The key is to put the mineral sample in a neutron beam, which converts potassium-39 into argon-39.

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