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Radon is colourless at standard temperature and pressure and it is the most dense gas known. At below temperature its freezing point is has a brilliant yellow phosphorescence. It is chemically unreactive, it is highly radioactive and has a short half-life.
Radon was sometimes used in hospitals to treat cancer and was produced as needed and delivered in sealed gold needles. Radon is used in hydrologic research because of its rapid loss to air. It is also used in geologic research and to track air masses.