Search academic texts

Information × Registration Number 0306U001061, 0105U006206 , R & D reports Title Research of permanence of the caesium-137 long-term fixation by an organic-mineral soil complex popup.stage_title Узагальнення даних щодо співвідношення фіксованих та мобільних форм Cs-137 в ґрунтах різних типів. Head Kononenko Ludmilla Vassyllivna, Registration Date 18-01-2006 Organization Institute of environment geochemistry popup.description2 Summarizing of data on the Cs-137 mobile to fixed species ratios in soils of different types and review of models of caesium sorption on soil and minerals was carried out. Study of soil contamination by global falls and as a result of failure on Chernobyl NPP testify that Cs-137 in equilibrium state is found to be mainly in the substantially fixed species. At contamination of soils by the Chernobyl solid-phase radioactive fallouts the ratio of mobile to fixed radionuclide species in soil continuously changed in course of time as a result of transformation processes. The dynamics of Cs-137 mobile species was characterized by achievement of maximum in 1,5-2 years after a failure and subsequent gradual decreasing of their parts. Review of available literature on the modelling of caesium sorption by soils, rocks and separate minerals showed that a great deal of models (mainly that of ionic exchange) for description of caesium sorption is offered for clay minerals. The models of surface complexing mostly are used for modelling of caesium sorption by the oxides (hydroxides) of iron and silicon. The models of physical-chemical sorption of caesium by soils and rocks are practically not available. It is proposed to apply the models of surface complexing for physical-chemical modelling of caesium sorption by mineral part of soils.56355635 Product Description popup.authors popup.nrat_date 2020-04-02 Close