Radioecological meta-database on the Yenisei river Catchment and Valley

Results of development of a sophisticated information system, including a meta-database for assessment of radiation impact on the population and natural environment in the Krasnoyarsk region of the Russian Federation are presented. The radioactive contamination of the Krasnoyarsk region has been formed in a number of stages: - 1954-1958 small global fallout from nuclear tests; - 1958-1969 maximum global fallout jointly with the Mining and Chemical Combine (MCC) radionuclide air releases and discharges of its single-pass nuclear reactors (commissioned in 1958 and 1964) into the Yenisei river; - 1969-1986 - MCC releases and discharges after the Krasnoyarsk hydroelectric plant dam, controlling the river water flow, had been built; - 1986-1992 MCC releases and discharges and long-distance Chernobyl fallout; - after 1992 after ceasing direct MCC discharges into the river (the single-pass reactors were shut-down) the formed contamination has been being redistributed due to natural processes in the valley and on the catchment. Primary data from various institutions and agencies of Russia have been analysed and compiled into files, corresponding to the different periods. The files are described in the metadatabase. The work is being carried out under the ISTC no. 2097 project. (author)