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After a long enough time the minority isotope is in an amount too small to be measured.

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It depends upon radioactive decay, which is known to be extremely stable, not influenced my chemical processes, and which can be measured quite accurately.

Thus the physical principle of the method is well established. The dates obtained by radiometric dating are verified by independent methods, including dendrochronology (tree rings), varve chronology (sediment layers), ice cores, coral banding, speleotherms (cave formations), fission track dating, and electron spin resonance dating.

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Radiometric dating is the method for establishing the age of objects by measuring the levels of radioisotopes in the sample. It decays to nitrogen 14 with a half life of 5730 years.

For example, potassium decays into two different isotopes of argon having different half-lives.

Argon/argon dating works using only the ratio of the concentration of the argon isotopes. For the purposes of this debate, "accurate" means that 95% of the dating errors are within 10% of the measured date, within the time span for which the isotope pair is utilized.

An error of 90% would, for example, still disprove Young Earth Creationism.

There are three reasons why radiometric data is known to be accurate: 1.

A key point is that it is no longer necessary simply to accept one chemical determination of a rock's age.

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