Irradiation of sorbents by ions of polymorphic metals for modeling 90strontium sedimentation.
OBJECTIVE
Advances in radioecology can support improvements in environmental remediation technologies, especially by illuminating interaction processes between polymorphic metal radionuclides and various materials and their ions in aqueous solutions. This study modeled interaction processes of 90Sr with transitive metals to delineate the behavior of polymorphic metal radionuclides. Experimental and modeling results confirmed Sr sedimentation was sensitive to the physical impact of radionuclides on various sorbents and possible chemical reactions occurring between the radionuclides and sorbents.


METHODS
Models were developed to simulate 90Sr sedimentation process, and the potential physical and chemical reactions accompanying the process. Models were verified, inorganic salts were used as sorbents to absorb metal cations, activity levels were recorded before and after mixing the inorganic salts while the efficiency of sedimentation using the heavy metals composites was quantified.


CONCLUSIONS
This research demonstrates that the process of the sedimentation is complex and occurs in several stages. Micro-structural analysis shows that zones of interaction between the sorbent and source metal are formed during the irradiation of the target's metal surface. Electrical-microscopic analysis indicates that the composition of the formed zones of interaction of Ti (Sr) with target metals has various structures. Roentgenophase analysis indicates that the interaction of the ions of a precipitable source and a target occurs according to constitution diagrams of equilibrium systems. The results indicate that application of inorganic salts composites based on modeling increases the efficiency of the deactivation of aqueous solutions when compared to standard aluminum sulfate composite.


CONCLUSIONS
Experimental and modeling results confirm 90Sr sedimentation is sensitive to the physical impact of radionuclides on various sorbents and possible chemical reactions occurring between the radionuclides and sorbents. The models support estimation of the physical impact of polymorphic metal radionuclides on various components of sorbents and possible chemical reactions occurring between the radionuclides and sorbents during the interaction. Inorganic salt composites deactivate and clear 90Sr and Sr+2 from water.
Department of Biophysics, Radiation Physics and Ecology, Moscow Engineering Physics Institute, Moscow, Russia.
Elena I
EI
Kurbatova
Alexandre I
AI
Ksenofontov
Alexey M
AM
Dmitriyev
James L
JL
Regens
D000327:Adsorption; D052918:Environmental Restoration and Remediation; D019015:Geologic Sediments / Q000737:chemistry*; D006801:Humans; D007477:Ions / Q000737:chemistry; D019216:Metals, Heavy / Q000737:chemistry*; D008962:Models, Theoretical; D013326:Strontium Radioisotopes / Q000737:chemistry*
D007477:Ions; D019216:Metals, Heavy; D013326:Strontium Radioisotopes