GLOSSARY
Radon definition
What does Radon mean?
A heavy radioactive gas given off by rocks containing radium (or thorium). These rocks have existed since the formation of Earth’s crust and radon is often the single largest contributor to an individual's background radiation dose, and is the most variable from location to location. Radon is a noble gas (a Group VIII element) – other members of the series are helium, neon, argon, krypton and xenon.
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