Particularities of ecological and hygienic radiation situation in 30-km zone of Chernobyl NPP at the late stage after the accident

"Radiation and Risk", 1993, vol. 3, pp.94-120


Savkin M.N.
Institute of Biophysics, Ministry of Public Health of Russia


The exclusion zone (so-called 30-km zone of Chernobyl Nuclear Power Plant) was finally formed in autumn, 1986 according to radiation and geographical criteria. Dynamic investigations have been carried out in the southern and the eastern parts of zone during 1989-1991. The ranges of soil contamination were equal to 20-370 kBq/m2 by 137Cs, 15-260 kBq/m2 by 90Sr and 7-90 kBq/m2 by 144Ce in 1991. Radioactive contamination is equivalently formed by both matrix particles and condensation particles. Local external and internal dose distributions and distributions of grass and foodstaff activities in settlements could be defined as log-normal functions with βg=1.8±0.2. Annual effective doses for people who lived into 30-km zone were below 5 mSv/y in 1989-1991. Doze zoning 30-km area and radiological aspects of rehabilitation of territory and resettling of points are discussed.

Key words/strong>
Soil contamination ranges, 137Cs, 90Sr, 144Се, radioactive contamination, fuel, condensation particles, dose distribution, external, internal exposure, contamination of grass and food, annual effective doses, dose zoning of territories, radiological aspects of rehabilitation, re-evacuation of the population.


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