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α-Radiolysis of the tributyl phosphate–hydrocarbon diluent–nitric acid system

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Abstract

α-Radiolysis of tributyl phosphate in Sintin n-paraffin diluent in equilibrium with HNO3 solutions at single “internal” irradiation from the extracted 238Pu was studied. The radiation-chemical yields (molecules/100 eV) of butyl hydrogen phosphates (BHP), carboxylic acids, carbonyl compounds, and nitro compounds upon irradiation of 20% TBP in the treated Sintin in equilibrium with 3 M HNO3 were 0.4 (at dibutyl hydrogen phosphate to monobutyl dihydrogen phosphate ratio HDBP: H2MBP = 4.3), 1.4, 0.2–0.3, and 0.2–0.3, respectively. The degradation and oxidation processes occur more deeply than under γ-irradiation. A simple volumetric method for determining carboxylic acids in the extract was developed. In the course of irradiation, the Pu(IV) oxidation state in the extract does not change, and its retention is due to the interaction with BHP at the ratio BHP: Pu = 2 in stripping with 0.02 M HNO3 and BHP: Pu = 4 in stripping with Fe(II). The retention can be eliminated by the displacing action of Np(IV).

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Authors and Affiliations

  1. Khlopin Radium Institute, 2-i Murinskii pr. 28, St. Petersburg, 194021, Russia

    B. Ya. Zilberman

  2. Research Institute of Atomic Reactors, Dimitrovgrad-10, Ulyanovsk oblast, 433510, Russia

    V. M. Chistyakov

Authors
  1. B. Ya. Zilberman
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  2. V. M. Chistyakov
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Correspondence to B. Ya. Zilberman.

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Original Russian Text © B.Ya. Zilberman, V.M. Chistyakov, 2016, published in Radiokhimiya, 2016, Vol. 58, No. 2, pp. 165–177.

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Zilberman, B.Y., Chistyakov, V.M. α-Radiolysis of the tributyl phosphate–hydrocarbon diluent–nitric acid system. Radiochemistry 58, 188–202 (2016). https://doi.org/10.1134/S1066362216020132

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  • DOI: https://doi.org/10.1134/S1066362216020132

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