Mapping the geogenic radon potential in Germany

Area of Science:

• Geosciences
• Environmental Science
• Radiological Protection

Background:

• Geogenic radon potential is a significant factor influencing indoor radon levels.
• A standardized methodology for mapping geogenic radon potential was lacking for Germany.
• Understanding radon distribution is crucial for public health and environmental planning.

Purpose of the Study:

• To develop and apply a standard methodology for estimating geogenic radon potential in Germany.
• To create a nationwide map of geogenic radon potential for planning purposes.
• To identify geological areas with high radon potential.

Main Methods:

• Distance-weighted interpolation of soil gas radon concentration and soil permeability data on a regular grid.
• Consideration of geological units in the regionalization process.
• Classification of radon concentration into categories: low, medium, increased, and high.

Main Results:

• High geogenic radon potential was found in 0.03% of Germany, primarily in regions with granites and Paleozoic basement rocks.
• Increased radon potential (7.86% of the area) is associated with basement rocks and certain sediments with higher uranium content.
• Medium radon potential covers 67.3% of the country, with low potential found in northern Germany's Cenozoic sediments (approx. 25%).

Conclusions:

• The developed mapping methodology provides a valuable overview of geogenic radon potential across Germany.
• Specific geological formations are strongly correlated with elevated radon potential.
• While the maps indicate potential, they cannot predict indoor radon levels in individual buildings due to factors like building construction.