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Radiometric dating accuracy wiki do online dating sites actually work

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Since then, geologists have made many tens of thousands of radiometric age determinations, and they have refined the earlier estimates.

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

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

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

C14 is continually being created and decaying, leading to an equilibrium state in the atmosphere.

When the carbon dioxide, containing C14 as well as stable C12 and C13, is taken in by plants it is no longer exposed to the intense cosmic ray bombardment in the upper atmosphere, so the carbon 14 isotope decays without being replenished.

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

Anyone questioning the accuracy of radiometric methods is obliged to explain why the cross-checks to sediments, coral growth, tree rings, and other isotope pairs all have the same errors.

Why would an error in radiometric dating correspond to errors in the other methods so that they all track?

There are about two dozen decay pairs used for dating.

Uranium 235 decay to lead has a half-life of 713 million years, so it is well suited to dating the universe.