1. ?Data on radioactive contamination of inhabited areas in the Russian Federation by cesium-137, strontium-90, and plutonium-(239+240) (on March 25, 1991),? State Committee of the USSR on Hydrometeorology, Obninsk (1991).
2. M. Eisenbud, Environmental Radioactivity From Natural, Industrial and Military Sources, Academic Press, New York (1987).
3. M. Yu. Orlov, A. N. Silant'ev, and V. P. Snykov, ?Post-Chernobyl radionuclide contamination and dose rate on the territory of Russia and Bellorus,? At. Énerg.,73, No. 3, 234 (1992).