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The influence of caesium-137 distribution in Poland's north-eastern ecosystem on effective dose 10 years after the
M Zalewski1, J Kapala, M Tomczak
1Department of Biophysics, Medical Academy, Bialystok, Poland.
Abstract:
A comparison is presented of particular methods of exposure in the first year after the Chernobyl disaster and ten years later. This comparison shows that the population exposure due to the presence of radiocaesium in the environment results from the presence of caesium contained in the soil, which provides 68% of the dose (as compared to 32% in 1987) while the influence of diet has been reduced to 32% (from 68%). The exposure from caesium-137 contained in the air has dropped from 14% to 0. The effective dose from caesium has been 50 times smaller than that from environmental sources of the natural radiation estimated for the region under study to be 1.61 mSv x y(-1).