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Throughout 2016 - 2021, a series of experimental studies on 137Cs uptake and excretion rate constants for the silver Prussian carp (Carassius gibelio) were conducted in the Chornobyl exclusion zone (ChEZ) under natural conditions. To confirm the metabolic parameters of 137Cs in the silver Prussian carp under strictly controlled conditions at different feed amounts real supporting laboratory experiments have been conducted. The excretion rate of the 137Cs from the silver Prussian carp increased with increasing feed amount from 0.0068 ± 0.0003 day−1 to 0.0085 ± 0.0005 day−1 at water temperatures of 26 °C. The biological half-life of 137Cs activity concentration in fish can be reduced by 2 times by increasing fish growth using clean feeding. The excretion rate of the 137Cs from the silver Prussian carp agreed with data collected in natural conditions in the ChEZ during 2016 - 2020 at different water temperatures. [ABSTRACT FROM AUTHOR]

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During 2012 - 2014 sampling of soil and grain in Ivankiv district of Kyiv region at all fields adjacent to the ChNPP exclusion zone was carried out, where the cereal crops were planted. In all samples 137Cs and 90Sr activities were measured. Besides, in soil samples the exchangeable fractions of 90Sr and calcium and acidity of soil solution were determined. Dependence of 90Sr soil-grain transfer factors was specified. In conducting research works by sampling occurred 74.14-37-425:2006 SOU, SOU SOU 74.14-37-424:2006 and 01.1-37-426:2006. The activity of 90Sr was determined by standard radiochemical method. [ABSTRACT FROM AUTHOR]

Results of the study of 90Sr and 137Cs migration mobility in soils characterized with contrasting physical-chemical properties and granulometric composition has been analyzed. The mentioned radionuclides were introduced in soils in initial water-soluble form. Ecological and effective half-time of cleaning of soils 20-cm horizons (Tecol) has estimated. Mean values of Tecol 90Sr varies in limits 3.7 - 84 years. Tecol 137Cs varies in limits 61 - 265 years. Correlation of ecological half-time cleaning of soddy-podsolic soils species from radionuclide and physical-chemical properties and granulometric composition of these ones has been analyzed, strong correlation of Tecol 90Sr as well, as mean correlation of Tecol 137Cs with mentioned soils characteristics has been noted. [ABSTRACT FROM AUTHOR]

In the year 2011 sampling of soil and grain in Ivankiv district of Kyiv region at all fields adjacent to the ChNPP exclusion zone was carried out, where the cereal crops were planted. In all samples 137Cs and 90Sr activities were measured. Besides, in the soil samples the exchangeable fractions of 90Sr and calcium and acidity of the soil solution were determined. Dependence of 90Sr soil-grain transfer factors was specified. [ABSTRACT FROM AUTHOR]