Monitoring and assessment of Cs and Sr radioactive isotopes in the 'soil - rhizosphere - sedge' system of the Yenisei River floodplain (near impact zone of Krasnoyarsk MCC, Russia).

Radiocaesium and radiostrontium contamination in the 'soil - rhizosphere - plants (aerial parts)' system was monitored in the floodplain ecosystem of the Yenisei River in the near impact zone of the Krasnoyarsk Mining and Chemical Combine (MCC). The monitored system included soil, rhizosphere, and sedge vegetation on islands and the river's east bank. The Cs and Sr specific activities displayed intricate space and time patterns controlled by the river water level, including the time and duration of floods and their correlation with the sedge vegetation season.

Distribution of Cs in lichens, mosses and pine needles along the transect from the north to the south of Western Siberia.

The Cs content in mosses (Hylocomium splendens), lichens (Cladonia stellaris) and the needles of the Siberian pine (Pinus sibirica) and the common pine (Pinus sylvestris) along the transect from the north to the south of Western Siberia from N. 67.5° to N.

Accumulation of natural radionuclides (Be, Pb) and micro-elements in mosses, lichens and cedar and larch needles in the Arctic Western Siberia.

This is a study of the atmospheric-origin natural radionuclides (Be and Pb) and a wide range of micro- and macro-element accumulation in mosses, lichens, cedar and larch needles in Arctic western Siberia (Yamal-Nenets Autonomous District). Based on the specific activities measurements of atmospheric precipitation markers (Be and Pb), this study found that the concentration of dust particles in the studied objects incrementally increases in the following order, from lowest concentration to highest: cedar needles, larch needles, lichens and mosses. Concentrations of Zr, Hf, Ti, Th, Fe, V, Li, Na, Si, Be, Y, rare earth elements (REE) and Sc in this area also increase in the same ascending sequence.

Discussions on the driving mechanism of postdepositional migration of Am and Cs in organomineral sediments (Lake Krugloe, Tomsk region, Russia).

A core of bottom sediments from Lake Krugloe located within the 30 km influence zone of the Siberian Chemical Plant (located in the city of Seversk "Tomsk-7") was studied to determine scales and rates of migration of artificial radionuclides Cs and Am in organomineral sediment. It was found that the main portion of Cs and Am was contained in the sediment interval above 10 cm. This means that the horizon of 10 cm corresponds to 1950-the time of the start of widespread tests of nuclear weapons.