Substantiated necessity of conducting a complex radiological zoning for optimization of radiation monitoring and decision making in case of nuclear accidents. Presented conceptual provisions and principles that based the radioe-cological zoning. Accepted the primary principle zoning - basin-landscape principle of differentiation territory. As zon-ing classifications features are presented the environmental features of the territory, which directly influence on the formation of the radiation situation following releases of radionuclides. Among them: the catchment basin, the types of elementary landscapes within it, the type of soil and agro-chemical soil properties, natural-use type and the cultures type. Presented the basic criteria for zoning on each of the features. Described the necessary input information and formulate the requirements for its scale and resolution for different levels of zoning. For the radiological characteristics of the selected areas settings are used the parameters of kinetic model of radionuclides behavior in system "soil - plant", developed according to the radiation monitoring agrosphere after the ChNPP accident.
Keywords: radioecological zoning, monitoring, basin-landscape principle, radionuclides, transfer factor.
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