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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.
Rock samples are recorded, marked, sealed and kept free of contamination and excessive heat on the way to the lab.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.The rock samples are crushed, in clean equipment, to a size that preserves whole grains of the mineral to be dated, then sieved to help concentrate these grains of the target mineral.The selected size fraction is cleaned in ultrasound and acid baths, then gently oven-dried.