A second problem is that for technical reasons, the measurement of argon and the measurement of potassium have to be made on two different samples, because each measurement requires the destruction of the sample.
If the mineral composition of the two sample is different, so that the sample for measuring the potassium is richer or poorer in potassium than the sample used for measuring the argon, then this will be a source of error.
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Potassium-Argon Dating Potassium-Argon dating is the only viable technique for dating very old archaeological materials.
When the rock recrystallizes it becomes impermeable to gasses again.
It is based on measurement of the product of the radioactive decay of an isotope of potassium (K) into argon (Ar).If one of these protons is hit by a beta particle, it can be converted into a neutron.With 18 protons and 22 neutrons, the atom has become Argon-40 (Ar-40), an inert gas.K-Ar Processing The Potassium-Argon dating method is an invaluable tool for those archaeologists and paleoanthropologists studying the earliest evidence for human evolution.As with any dating technique, there are some significant limitations.