Batch experiments have been carried out to measure K d values, their variations, and some other parameters for radionuclides of interest in safety assessments including long-lived β/γ fission products and α emitters, such as Ra and the light actinides. The parameters investigated were mainly the concentrations of the elements competing with the radionuclides and the pH of the aqueous phases. The systems studied were as close as possible to those that could reasonably be expected to be encountered in a surface/near surface radioactive waste repository. A number of partition mechanisms are discussed.
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