The average radiation burden in Germany is 150 millirem (mr). Just by living in homes with a variety of building materials, the following has to be added:
- Granite/Slag: +150 mr = total 300 mr
- Plaster: +65 mr = total 215 mr
- Brick and Concrete: +20 mr = total 170 mr
- Natural Wood: -10 mr = total 140 mr
The only building material which can actually lower radiation is natural wood.