Radon is formed as part of the normal radioactive decay chain of uranium and thorium.
2.
These differences were considered to be an exception attributed to lead isotopes being products of the natural radioactive decay chains of uranium.
3.
Radon has a half-life of approximately 3.8 days, which means that it can be found only shortly after it has been produced in the radioactive decay chain.
4.
Radon is formed as part of the normal radioactive decay chain of uranium into most common isotope has a very long half-life ( 4.5 billion years ), which is the time required for one-half of uranium to break down.
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