How are Samples Processed? Potassium-Argon Dating Potassium-Argon dating is the only viable technique for dating very old archaeological materials. Argon, being a noble gasis a minor component of most rock samples of geochronological interest: This mineral sample is then baked gently overnight in a vacuum furnace. We know the precise natural mix of potassium and argon isotopes.
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Potassium-Argon Dating Methods
Dendrochronology 8. The selected size fraction is cleaned in ultrasound and acid baths, then gently oven-dried. When 40 K decays to 40 Ar argonthe atom typically remains trapped within the lattice because it is larger than the spaces between the other atoms in a mineral crystal. Radiocarbon Dating 9. The radioactive decay scheme involving the breakdown of potassium of mass 40 40 K to argon gas of mass 40 40 Ar formed the basis of the first widely used isotopic dating method. Introduction 3.