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Ca F is also routinely irradiated and measured to determine the Ar technique relies on ratios instead of absolute quantities, we are able to extract and measure multiple aliquots of argon from a single sample.

The NMGRL does this by irradiating samples in machined aluminum disks where standards and unknowns alternate every other position.

However, the Argon, a noble gas, constitutes approximately 0.1-5% of the Earth's present day atmosphere.

Because it is present within the atmosphere, every rock and mineral will have some quantity of Argon.

Potassium can be mobilized into or out of a rock or mineral through alteration processes.

Due to the relatively heavy atomic weight of potassium, insignificant fractionation of the different potassium isotopes occurs.

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Instead, the ratios of the different argon isotopes are measured, yielding more precise and accurate results.

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