Radiolysis products and degradation mechanism studies on tri-isoamyl phosphate (TiAP)

Abstract As an alternate extractant for spent fuel reprocessing, the radiolysis properties of TiAP should be systematically studied to evaluate the feasibility of using it in engineering scale. In this paper, the irradiation stability of TiAP was investigated by using the concept of radiolysis ratio and G value. It is found the extent of radiolysis would be increased with the increasing of absorbed doses, but decreased with the increasing of pre-equilibrium aqueous HNO 3 concentration. Furthermore, the radiolysis products were analyzed qualitatively and quantitatively with gas, liquid and ion chromatograph, based on which the possible radiolysis mechanism of TiAP was also concluded.