Radiation Exposure, Natural
Radiation Exposure, Natural : In Germany the natural radiation exposure for most of the inhabitants amounts to 1 to 6 mSv per year with an average value of 2.1 mSv per year. External radiation exposure contributes to one third and internal radiation exposure to two thirds of the effective dose from all natural radiation sources. The dose due to external irradiation comes in equal proportions from cosmic radiation, potassium-40 and nuclides of the uranium and thorium chain. Approximately three quarters of the effective dose due to incorporated radionuclides is made up of radon-222 and radon-220 and in particular their short-lived decay products, followed by potassium-40 and polonium-210.
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