Abstract
The radiolysis of di(2-ethylhexyl)phosphoric acid causes deterioration of the extraction of Sr(II) at about pH 5. This effect is attributed to the main radiolysis product, mono(2-ethylhexyl)phosphoric acid. However, MEHPA shows an ability of extracting Sr(II) in an acid medium. The presence of TBP prevents MEHPA from extracting Sr(II) in acidic solutions. The decrease of Df due to γ-irradiation is almost consistent with that estimated from the G values for the decomposition of DEHPA and formation of MEHPA. The diluent effect of radiolysis on the extraction was also determined.
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