Because Ar has a very short half-life, it is guaranteed to be absent in the sample beforehand, so it's a clean indicator of the potassium content.
The advantage is that all the information needed for dating the sample comes from the same argon measurement. This method is commonly called "argon-argon dating."The physical procedure for K.
With each increment in quality, more subtle sources of error have been found and taken into account.
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Variations in this data may point to errors anywhere in the process, which is why all the steps of preparation are recorded in detail.
K-Ar analyses cost several hundred dollars per sample and take a week or two.
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