The extraction behavior of U(VI), Th(IV), Zr(IV), Eu(III) and Am(III) from 3.5M nitric acid with a series of gamma-pre-irradiated
symmetrical and unsymmetrical monoamides in benzene has been investigated up to a dose of 100 Mrad. The results indicated
that the radiolytic stability is influenced by the structure of amides. Symmetrical monoamides seem to be less affected by
radiation compared with unsymmetrical monoamides. Infrared studies identify the final products of radiolysis as the respective
carboxylic acids and amines. The radiolytic degradation of the investigated monoamides has been estimated by quantitative
IR spectroscopy. Extraction data obtained under similar experimental conditions for U(VI), Th(IV) and Zr(IV) with the TBP/benzene
system have also been compared.