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  • 1 Comissão Nacional de Energia Nuclear Instituto de Radioprotecão e Dosimetria Barra da Tijuca Caixa Postal 37750 CEP 22780-190 Rio de Janeiro RJ Brazil
  • 2 Universidade Católica do Rio de Janeiro Departamento de Química, Pontifícia Rua Marquês de São Vicente 225, Gávea CEP 22453-900 Rio de Janeiro RJ Brazil
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A so-called hour method for the determination of plutonium based on extraction chromatography is validated by its application to several certified soil and sediment samples from the International Atomic Energy Agency's Seibersdorf Laboratory. The results are in good agreement with the reference values. Chemical yields range between 47%–66%, with a mean value of (56±6)%. The possible use of this method for241Pu determination is also demonstrated.