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Information × Registration Number 0221U107217, 0119U101868 , R & D reports Title Experimental and theoretical modelling of interaction processes of system of engineering barriers materials of radioactive waste deep repository and development of new composite sorbents of radionuclides on the basis of natural and synthetic matrices. popup.stage_title Head Shabalin Borys H., Registration Date 29-12-2021 Organization State Institution "The Institute of Environmental Geochemistry of National Academy of Sciences of Ukraine" popup.description2 A mathematical model for environmental risk assessment has been developed. The model considers the environmental impact of a hypothetical deep geological repository of vitrified high-level radioactive waste from WWER reactors constructed in crystalline rocks of the Chornobyl Exclusion Zone and the adjacent regions. The calculated maximum migration rates are (Bq/year): for 137Cs – 9.12E + 06; 90Sr – 3.83E + 07; 241Am – 6.40E + 07; 239Pu – 2.88E + 06, and the mortality risk per year is 4.02E-09, which is significantly lower than the target value – 5E-07/year. Synthesized composite sorbents with an active phase of manganese dioxide are characterized by increased selectivity for strontium radionuclides. The inorganic phase structure influence on the adsorption parameters of the sorbents has been studied. The birnessite-type composite sorbent (MnO2 layered structure) has high adsorption capacity and adsorption stability in sorption-desorption cycles. The cryptomelane-type composite sorbent (MnO2 tunnel structure) demonstrates irreversible fixation of strontium ions. Product Description popup.authors Bondar Yuliia V Buhera Serhii P Kuzenko Svitlana V Lavrynenko Olena M Mitsiuk Natalia B Slyvinskii Viktor M Yaroshenko Kostiantyn K popup.nrat_date 2022-03-09 Close