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Conductivity changes were found which followed the reaction of radiolytically generated OH radicals with the potassium salt of polyuridylic acid (poly U) in aqueous solution. After  60 Co-γ-irradiation the observed increase of conductivity at pH = 6.8 was shown to consist of the liberation of K +  ions from the stock of K +  ions electrostatically bound to the polyanion. The initial G(K + ) is 36 and hence 6 times higher than the G value of OH radicals in N 2 O saturated solutions. At a poly U concentration of 60 mgl -1  half of the ion release occurred at 12 J kg -1  and nearly all ions are released at 40 J kg -1 . The liberation of K +  is explained to be a consequence of the formation of chain breaks leading to an increase of the degree of dissociation.

Release of K + and H + from Poly U in Aqueous Solution upon γ and Electron Irradiation.Rate of Strand Break Formation in Poly U