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The most commonly used radiometric dating methods are potassium-argon, uranium-lead, and rubidium-strontium. Half-life is simply the time required for half of the atoms in a pound of uranium, for example, to disintegrate into lead.The concept of how these methods work is simple: one element decays into another at a rather predictable rate. If these assumptions are correct, then the radiometric dates are correct.These assumptions are not demonstrated, only supposed to be true.To give an example of the complexity of this problem, this paper presents a study of the most popular dating method, potassium/argon.However, there is no way to independently test these assumptions.

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Since the initial physical state of the rock is unknowable, the age can only be estimated according to certain assumptions.

Firstly: please try not to bring creation/evolution into this.

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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.

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There is even a special case that a “no-change” update doesn’t do any decompression, although a comment from Randolf Geist on the previous article pointed out that this special case wasn’t implemented until; and a follow-up from “DBA” showed that the special case code seems to fail sometimes – possibly if you update a large number of rows in a block.

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