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Interactions of radionuclides in extremely low concentrations were determined by measurement of their apparent self-diffusion coefficients. Formation of trace amounts of hydrolysis products, hydroxides of Ru IV , Mn IV , Fe III , Eu III  and of ionic precipitate of AgI were determined from apparent self-diffusion coefficients. Transition of  85 Sr 2+  by ion exchange or by coprecipitation into trace amounts of Fe III -hydroxide and Mn IV -hydrated oxide was revealed by this method.  85 Sr 2+  sorbed on trace amounts of Fe III -hydroxide and Mn IV -hydrated oxides lost its individual chemical properties. This can negatively affect its separation from solution. Formation of unstable embryos of Ag 131 I trace precipitate in unsaturated solution at concentration of Ag +  1 · 10 −9  mol · l −1  and  131 I −1  · 10 −8  mol · l −1  was detected by self-diffusion. Formation of trace amounts of Ag 131 I led to the decrease of sorption of  131 I −  on hydrated ferric oxide.

Interactions of radionuclides in solution with ions and with trace concentrations of solid phase