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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.

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

Additional advantages of the single isotopic measurements of the K.

The monitoring of the interfering reactions is performed through the use of laboratory salts and glasses.

For example, to determine the amount of reactor produced Ar ratio of the glass is then measured in the mass spectrometer to determine the correction factor that must be applied to the rest of the samples in that irradiation.

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.

Therefore, unlike the conventional K/Ar technique, absolute abundances need not be measured.

Ar total fusion measures ratios, making it ideal for samples known to be very argon retentive (eg. Total fusion is performed using a laser and results are commonly plotted on probability distribution diagrams or ideograms.

In order for an age to be calculated by the Ar technique, the J parameter must be known.

Argon can mobilized into or out of a rock or mineral through alteration Ar and potassium, there is not a reliable way to determine if the assumptions are valid.

Argon loss and excess argon are two common problems that may cause erroneous ages to be determined.