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  • 1 UNAM Facultad de Estudios Superiores, Unidad Cuautitlán México
  • 2 Instituto Nacional de Investigaciones Nucleares Departramento de Química Nuclear Agricultura 21 C. P. 11800 México City D. F. México
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We report results obtained on the separation of lanthanum, cerium, and samarium from synthetic and natural uranium samples by means of solvent extraction and ion exchange. Quantitative determinations of these elements were performed using X-ray fluorescence, polarography, and chemical or neutron activation analysis.