Abstract
The extraction of Np(IV), Zr, Nb, Cs, Ce(III) and Am(III) from nitric acid solutions containing oxalate and phosphate ions by solutions of 1-phenyl-3-methyl-4-benzoylpyrazolon-5 (PMBP) and tri-n-butyl phosphate (TBP) in benzene has been investigated. A solution 0.1M in respect to PMBP and 0.25M in respect to TBP was found to extract 99% of neptunium from aqueous solutions 1M in respect to H3PO4 and 0.5M in respect to HNO3. Under these conditions, the extraction of the other investigated elements does not exceed 0.1%. Based on this finding, a procedure was developed to determine243Am through its daughter product239Np in solutions containing large quantities of curium and its fission products. The sensitivity of the procedure is 1·10−7 mg of243Am in the sample. The243Am content is obtained by calculation from measurements of the γ-activity of the extracted239Np. The purification ratio of239Np is∼105 from Zr, Nb and Ru, ∼108 from Ce and Cm and >1012 from Cs.
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Lebedev, I.A., Myasoedov, B.F. & Palei, P.N. Determination of americium-243 through its daughter product neptunium-239. J. Radioanal. Chem. 5, 61–69 (1970). https://doi.org/10.1007/BF02513700
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DOI: https://doi.org/10.1007/BF02513700