Radiolysis study of actinide complexing agent by irradiation with helium ion beam

Sugo, Yumi; Taguchi, Mitsumasa; Sasaki, Yuji  ; Hirota, Koichi; Kimura, Takaumi 

In the actual partitioning process of HLW, the organic complexing agent will be exposed to -particles emitted by -decay of the actinides. In this study, -radiolysis of TODGA in -dodecane was investigated by the irradiation with helium ion beam accelerated by the AVF cyclotron or the tandem accelerator in the TIARA facility at JAEA Takasaki. It was found that the radiation chemical yield for the degradation of TODGA by helium ion beam irradiation was less than that by -rays irradiation. It was also observed the radiation chemical yield gradually increased with the incident energy of helium ions. These results indicate that the radiolytic degradation of TODGA is reduced by high LET radiations such as -particles. Because the radical cations of -dodecane, which contribute to the charge transfer reaction described above, decrease by recombination in track.