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Radiation-induced effects during the extraction of Pu-239 nitrate with a solution of tributyl phosphate in octafluoropentanol formal

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Abstract

Extractive treatment of ≥ 0.2 M 239Pu solution in an acidified mixture of tributyl phosphate and octafluoropentanol formal is accompanied by radiolytic degradation of the components. The coefficient of plutonium inter-phase distribution decreases by 4.1 times at 470 kGy α-irradiation dose. Cyclic electron beam radiolysis at 140 kGy increases the residual concentration of plutonium in the organic phase by 3–5 times after re-extraction and by 4–6 times after regeneration. The rate of inter-phase separation is reduced by 5 times during extraction, by 4 times during re-extraction, and by 2–3 times during regeneration.

Article highlights

The extractability of 239Pu deteriorates due to the reduction of nitrate ions and their replacement by fluoride ions.

The formation of heavy radiolytic products causes an increase in viscosity and a slowdown in phase separation.

Regeneration of the organic phase serves as a means of eliminating the negative effect of radiolysis at 50–60 kGy.

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Acknowledgements

The investigation was performed using the equipment of CKP FMI IPCE RAS and UNU KRHI IPCE RAS.

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Correspondence to Elena V. Belova.

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Belova, E.V., Ponomarev, A.V. & Smirnov, A.V. Radiation-induced effects during the extraction of Pu-239 nitrate with a solution of tributyl phosphate in octafluoropentanol formal. J Radioanal Nucl Chem 331, 4405–4412 (2022). https://doi.org/10.1007/s10967-022-08511-x

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