Radon is a naturally occurring, radioactive noble gas. Radon exists everywhere -
almost all rocks and soils contain different concentrations of uranium and radium and are therefore sources of radon.

In numerous research projects of the Federal Ministry of Environment, Nature Conservation and Nuclear Safety (BMU) and the Federal Office for Radiation Protection (BfS), a relationship between buildings with elevated radon levels in indoor air and the level of radon concentration in soil gas could be detected.


Regardless of the soil gas concentration a number of construction type specific factors have an important influence on the actual radon levels in buildings.
Research projects have shown that the presence of a cellar, the design and execution of the floors and walls, up to the moisture protection in the basement or the obstruction of natural stones, strongly influences the radon concentration in the building in the long term. In addition, the entry paths for radon from the ground in each building are different.


Due to the interaction of many different factors, the radon concentration inside a building is not predictable, but can only be determined by measurement!