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.
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.
Mechanical crushing is also a technique capable of releasing argon from a single sample in multiple steps.
The primary standard must be a mineral that is homogeneous, abundant and easily dated by the K/Ar and Ar methods.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.The isotopes the KAr system relies on are Potassium (K) and Argon (Ar).Potassium, an alkali metal, the Earth's eighth most abundant element is common in many rocks and rock-forming minerals.