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What simplifies things is that potassium is a reactive metal and argon is an inert gas: Potassium is always tightly locked up in minerals whereas argon is not part of any minerals. So assuming that no air gets into a mineral grain when it first forms, it has zero argon content.That is, a fresh mineral grain has its K-Ar "clock" set at zero.Lava flows that lie above and below rock beds with ancient human fossils are a good—and true—example. The conventional K-Ar dating method depends on the assumption that the rocks contained no argon at the time of formation and that all the subsequent radiogenic argon (i.e., Ar that has accumulated.Equilibrium with the atmosphere therefore produces minute concentrations of dissolved argon in water.Water sample sizes range from 2 liters (if vacuum degassing is used) to 15 cubic meters (if the sample is to be boiled) (Clark & Fritz 1997).Ar dating technique is a recently developed analytical variation of the conventional K-Ar method.

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For example, if Ar dating method can overcome these limitations of conventional K-Ar dating, and has the added advantage that potassium and argon are determined on the same sample and that only measurements of the isotopic ratios of argon are required.Argon analysis is purely research-based at present because of the very small concentration of argon in water.

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