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Alpha-radiolysis of organic extractants for separation of actinides

Sugo, Yumi; Taguchi, Mitsumasa; Nagaishi, Ryuji; Sasaki, Yuji; Hirota, Koichi; Morita, Yasuji

The radiolytic stabilities of the organic extractants for the separation of actinides have been commonly evaluated by the irradiation with $$gamma$$-rays as the most convenient method. However in the actual partitioning process of HLW, the extractants will be exposed to alpha-particles emitted from actinides, as well as beta- and $$gamma$$-rays from various fission products. In this study, alpha-radiolysis of ${it N,N,N',N'}$-tetraoctyldiglycolamide (TODGA) in ${it n}$-dodecane was investigated by the irradiation with helium ion beam accelerated by a tandem accelerator using the TC1 irradiation apparatus in the TIARA facility. The sample was also irradiated with $$^{60}$$Co $$gamma$$-rays for comparison of the radiation chemical yields between $$alpha$$- and $$gamma$$-rays. It was found that TODGA had almost fourfold resistance to $$alpha$$-rays, as compared with $$gamma$$-rays. This result suggests that the radiolytic degradation of TODGA has been hitherto overestimated only by the irradiation with $$gamma$$-rays.

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