Primary Radiolytic Reactions in the Auger Blob Formed by Radioactive Transformation of 57Co into 57Fe in Frozen Aqueous Medium

S.V. Stepanova,b, Yu.D. Perfil'evc, V.M. Byakova,c,d and L.A. Kulikov c aInstitute for Theoretical and Experimental Physics, B. Cheremushkinskaya 25, Moscow, Russia bNational Research Nuclear University "MEPhI", Kashirskoye shosse 31, Moscow, 115409, Russia cLomonosov's Moscow State University, Chemical Department, Leninskie Gory, Moscow, Russia dD. Mendeleyev University of Chemical Technology of Russia, Miusskaya sq., 9, Moscow, Russia

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The emission of the Auger electrons during the formation of the Mössbauer nucleus 57Fe leads not only to the formation of multicharged 57Fen+ ion, but also to the appearance of the Auger blob, a cloud of several hundreds of ion-electron pairs (H2O+, e¯) in the solvent around the Fe ion. Fast radiation-chemical reactions therein determine the experimentally observable ratio of the yields of final chemically stable charged states of the Mössbauer ions (Fe3+ and Fe2+). This ratio strongly depends on reaction rates constants between H2O+, e¯, and the solute S. We have shown that in contrast to radiation chemical data the reactivity of NO3- anions with quasi-free track electrons in frozen aqueous solutions exceeds those of H3O+, ClO4-, and HSO4- ions only by a factor of three instead of ≈ 100 which follows from the radiation chemical experiments.

DOI: 10.12693/APhysPolA.125.843 PACS numbers: 76.80.+y, 82.50.Kx, 82.80.Ej