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Radiometric dating flaws

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Many people assume that the dates scientists quote of millions of years are as reliable as our knowledge of the structure of the atom or nuclear power.

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(the same) size, then it can be safely assumed that the half-life of that decay is a constant.

We note that at the instant the swimmer touches the end of the pool our wristwatch reads and 53 seconds.

How long has the competitor taken to swim the race?

The time that it takes for half of a sample to decay is known as the half life of the isotope.

Some isotopes have half lives longer than the present age of the universe, but they are still subject to the same laws of quantum physics and will eventually decay, even if doing so at a time when all remaining atoms in the universe are separated by astronomical distances.