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Ionising Radiation > Radon > Radon in soil
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Radon in soil
 Radon is constantly generated in soil by the radioactive decay of radium. The radon concentration in soil air greatly influences the radon migration into a building. The ratio of the radon concentration in room air to the concentration in soil air typically amounts to 1 to 5 ‰. A map of radon concentrations in soil air in Germany is the basis for assessing the regional radon situation.
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Radon in soil air
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The radon arising in the soil partly reaches the surface and is released into the atmosphere. The exhalation rate strongly depends on the permeability of the soil and weather conditions (temperature, humidity, air pressure). Radon can also be dissolved in ground water and migrates in bedrock (full text in German only).
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The radon map of Germany
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 The radon map of Germany specifies the regional distribution of radon concentrations in soil air 1 m below the surface. It has been calculated on the basis of 2346 measurement points, which are representative of the geology. Using this map, regional distributions of radon concentrations in buildings can be estimated.
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