Radon is formed as part of
the normal radioactive decay chain of uranium.
Uranium has been present since the earth was formed and its most common isotope has a very long half-life (4.5 billion years), which is the amount of
time required for one-half of uranium to break down. Uranium, radium, and thus
radon, will continue to occur for millions of years at about the same
concentrations as they do now.
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