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The term half life describes the time taken for half of a total amount of radioactive isotopes to decay. However that doesn't mean that they all take exactly that length of time. Some will decay much more quickly than that and some more slowly.

As such even though the half life is longer than the age of the earth, some of the

Rubidum 87 isotopes will have decayed. Based on the proportion of rubidum 87 to the daughter isotopes you can still use this for dating materials younger than the half life of rubidum 87.

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