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A useful concept is half-life (symbol is \(t_\)), which is the time required for half of the starting material to change or decay.Half-lives can be calculated from measurements on the change in mass of a nuclide and the time it takes to occur.If the standard is of historically known age, such as would likely be used for testing Ar-Ar dating on sample of known age, then one would be more likely to get the correct age.For allegedly older samples K-Ar is used to "date" the standard and as such it still has the same problems as K-Ar dating.Now in all fairness Ar-Ar dating can get the right age for a sample of known age, but it can also date samples as way too old, but without a known date there is no way of knowing when it is too old.

Uranium-Thorium-Lead Method Ages" in Billions of Years Some soil from the Moon has been dated as more than a billion years older than the uniformitarian age for the Moon.Water flow through rocks is important because all parent substances and many daughter substances are water soluble.This is particularly important in light of the Biblical flood.Each radioactive isotope will have its own unique half-life that is independent of any of these factors.Figure \(\Page Index\): For cobalt-60, which has a half-life of 5.27 years, 50% remains after 5.27 years (one half-life), 25% remains after 10.54 years (two half-lives), 12.5% remains after 15.81 years (three half-lives), and so on. The half-lives of many radioactive isotopes have been determined and they have been found to range from extremely long half-lives of 10 billion years to extremely short half-lives of fractions of a second.

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