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Facts and definitions

Most of the radon gas in buildings come from the underground soil. The amount of radon entering a building depends on the soil gas radon concentration (due to the emanation rate) and the radon supply (due to the permeability of the soil).

The radon gas concentration and the radon supply are often combined to the radon potential, an amount of radon near the basement which potentially enters the house. In the USA the radon potential is used as the probability of exceeding a certain radon concentration in houses.