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This will always be true due to the finite limits of measuring equipment.
This does not mean that radiometric dates or any other scientific measurements are unreliable.billion years, the chronometric age of a sample can be calculated.
In addition, any argon that existed prior to the last time the rock was molten will have been driven off by the intense heat.
As a result, all of the argon-40 in a volcanic rock sample is assumed to date from that time.
One half-life is the amount of time required for of the original atoms in a sample to decay.
Though 89% decays to Calcium 40, it is not suitable for measurement since most rocks contain Calcium 40 as a primary element, and the amount caused by the decay of K 40 cannot be determined.
The intensity of thermoluminescence is directly related to the amount of accumulated changes produced by background radiation, which, in turn, varies with the age of the sample and the amount of trace radioactive elements it contains..
It is also based on the fact that background radiation causes electrons to dislodge from their normal positions in atoms and become trapped in the crystalline lattice of the material.
It is used primarily on lava flows and tuffs and for ocean floor basalts.
Potassium, which is present in most rocks and minerals, has a single , K 40.