[en] Short communication

[en] It is established that debalanced water disposal to Ol'khovskoe swamp while Beloyarsk NPP operation doesn't lead noticeable increase of ⁹⁰Sr content in it. As a rule, concentration of this nuclide in components of the ecosystem investigated doesn't exceed a background one, caused by total fall-outs from the atmosphere. At the same time, some increased content of ¹³⁷Cs in the swamp is noticed. But, if one compares the content of this radionuclide in the water of the swamp-river ecosystem investigated with permissible concentration of it in potable water (NRB-76), it becomes evident that Ol'khovskoe swamp water and water of river Ol'khovka contain ¹³⁷Cs 10² times less than its permissible values

No abstract available

[en] The results of experiences on studying vertical migration, distribution in soil and tritium intake in the HTO form in plants at various methods of their irrigation (surface and subsoil) are presented. Tritium distribution at the soil profile depth depended on the method of irrigation. At surface irrigation radiator concentration has grown with the depth, at subsoil irrigation as a rule, lowered with depth. The analysis of vegetable material has shown that HTO content in free water (given off at +105 deg) constitutes 0,03 and 0,4% of found quantity, respectively at subsoil and surface irrigation. It is concluded that vertical migration, character of distribution in soil and HTO implantation into plants depend on intensity relation of ascending and descending currents of moisture created when using variuos methods of soil irrigation

[en] The theory of living substance and the Earth biosphere by the brilliant Russian scientist V.I. Vernadsky has produced a great world view effect. Basing on this theory another prominent Russian researcher N.V. Timofeev-Resovsky came up to formation of a new scientific discipline - radioecology. He identified two basic areas of research in radioecology (radiation biocenology): 1) studies of the radionuclide fate in natural ecosystems and 2) assessment of biological effects of ionizing radiation on living organisms, population, ecosystems. In our research activities conducted in the East Uralian Radioactive Trail (EURT) zone resulted from an accident at the Mayak concern in 1957, we attempted to advance some ideas of Timofeev-Resovsky (1957). The objectives of research were to assess recent levels and distribution of radio-nuclides between ecosystem components along the contamination gradient and 2) to study effects of low levels of chronic radiation exposure on populations of herbaceous plants (author)(tk)

[en] Calculations of maximum permissible radionuclide disposals to aquatic ecosystems under NPP effect are grounded. Calculations are performed using the method of mathematical simulation of process of nuclide migration in the systems studied. To construct the models, results of radioecological investigations in the NPP zone are used

[en] In three pine-birch stands located 1.5, 6, and 18 km from the Chernobyl nuclear power plant (CNPP), the authors studied accumulation of ^134+137Cs and ₉₀Sr by catkins and leaves of European birch. Changes in the concentration of these radionuclides in structural elements of the catkins and in the leaves were shown in different years, and quantitative characteristics of the radionuclides passage from the soil into generative organs and leaves are given

[en] The authors studied peculiarities of the behavior of long-lived radionuclides in floodplain landscapes of the Techa River. The effect of floodplain soil formation and hydrological conditions on the radionuclides' migration in the soil and plant cover was noted. The question of the role of floodplain landscapes as geochemical barriers and sources of secondary contamination of the Ob river system is discussed

[en] The results are presented of radioecological and radiobiological investigations in forest biogeocenozes of the 30 kilometer zone of failure in the Chernobyl Nuclear Power Station. The authors present the quantitative evaluation of the distribution of radionuclei in the main component of the soil-plant layer in landscape areas linked in the drainage flow. The morphophysiological special features and hidden variations of the seeds of certain representatives of woody and herbaceous plants of the 30 kilometer zone of the Chernobyl Nuclear Power Station are determined. 12 refs., 5 figs., 3 tabs

[en] ⁹⁰Sr and ¹³⁷Cs contents in soils of the central axis of East-Ural radioactive track of its eastern and western parts are determined. Within Chelyabinsk and Sverdlovsk regions after 40 years from Kyshtym accident in 1957 the ⁹⁰Sr resource in soils in the track central axis near contamination source 1200 times higher than that of controlled levels, at the distance of more than 100 km the ⁹⁰Sr resource 6-20 times higher than that of controlled levels. ¹³⁷Cs resource out of 30 km zone of Mayak plant does not depend on the distance from the contamination source and constitutes 9-15 kBq/m²