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I don't read German freely, but I can read graphs fortunately :) So these radiation levels from Chernobyl fallout - at 0.6 mSv per year - are absoutely negligible. Average exposure from natural sources (sun, space radiation, ground etc) is 3 mSv.
To give you a comparison against some real world values: a cigarette smoker gets 160 mSv per year from tobacco alone.
