Radon is not produced as a commercial product.
Most soils contain varying amounts of uranium.
It is usually found in rocks and soil, but in some cases, well water may also be a source of radon. Radon is also fairly soluble in water and organic solvents. Although reaction with other compounds is comparatively rare, it is not completely inert and forms stable molecules with highly electronegative materials. Radon is considered a noble gas that occurs in several isotopic forms. It is radon-222 that most readily occurs in the environment.