JOURNAL DE PHYSIQUE Colloque C2, supplkment au n O 3, Tome 40, mars 1979, page C2-434 M~SSBAUER STUDIES ON THE RADIATION DAMAGE PRODUCED B Y ELECTRON CAPTURE AND GAMMA

Rgsum6.- Les effets chimiques produits par capture Glectronique et radiolyse gamma dans divers s616nates de Co(I1) et de Fe(I1) ont Et6 5tudibs par spectroscopie ~zssbauer en Lmission et absorption. On montre qu'en plus des mol6cules d'eau d'hydratation, l'anion SeOc-fournit aussi des radicaux oxydants vis-8-vis de ~ e ~ +. Abstract.- The chemical effects produced by electron capture and ganrma radiolysis in various Co(I1) and Fe(I1) selenates have been studied using emission and absorption Gssbauer spectros-copy. It is shown that not only the hydration water molecules but also the Sea-anion give rise to oxidizing radicals against ~ e ~ +. Introduction.-The after effects of the electron cap-ture in 5 7 ~ o have been studied by emission Mzssbauer spectroscopy in a large number of chemical systems. In 57~o-labelled cobalt compounds with polyatomic ligands, it has been suggested /l / that the stabi