Gamma radiation effects on potassium pertechnetate in carbonate media.
Gamma radiation effects on the stability of the oxidation state of radioelements and diffusion within the framework of nuclear waste repositories are often neglected, although it may influence physicochemical processes and thus transfer to biosphere and geosphere. This knowledge is essential to model transport phenomena. This study reports on effects of gamma irradiation on technetium in carbonate media, which is representative of natural systems. Depending on media compositions, the gamma irradiation on pertechnetate leads to formation of Tc(IV) only in the absence of carbonate. CO3*- radicals are able to re-oxidise technetium intermediate oxidation states to the +7 state.
Said
K B
KB
Laboratoire Subatech, UMR 6457 Université de Nantes/Ecole des Mines de Nantes/CNRS (IN2P3), Ecole des Mines de Nantes, France. bensaid@subatech.in2p3.fr
Seimbille
Y
Y
Fattahi
M
M
Houee-Lévin
C
C
Abbé
J C
JC
D002254:Carbonates; D004058:Diffusion; D005609:Free Radicals; D005720:Gamma Rays; D008956:Models, Chemical; D008962:Models, Theoretical; D010084:Oxidation-Reduction; D011188:Potassium; D011850:Radioactive Waste; D013670:Sodium Pertechnetate Tc 99m
D002254:Carbonates; D005609:Free Radicals; D011850:Radioactive Waste; D013670:Sodium Pertechnetate Tc 99m; D011188:Potassium