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Souza, M.A. de; Marques, L.S.
Instituto de Pesquisas Energeticas e Nucleares, Sao Paulo (Brazil)1982
Instituto de Pesquisas Energeticas e Nucleares, Sao Paulo (Brazil)1982
AbstractAbstract
[en] The determination of Nd and Gd present in rocks by neutron activation analysis is aimed at. A separation procedure for the rare earth group of elements is presented. The method is based on the retention of 233Pa, 182Ta and 46Sc by hydrated antimony pentoxide (HAP) in a 6M HClO4 medium. Those radioisotopes are interferences in the gamma-ray spectrum of 153Gd and 147Nd. The reliability of the method was tested by means of the geological standards BCR-1 and G-2 from the U.S. Geological Survey. The limitations of the instrumental neutron activation analysis and the advantages of the chemical separation are discussed for the special case of the Nd and Gd determinations. (Author)
[pt]
A finalidade deste trabalho e determinar Nd e Gd, presentes em rochas, por analise por ativacao com neutrons. Apresenta-se um metodo de separacao do grupo dos lantanidios. O metodo baseia-se na retencao de 233Pa, 182Ta e 46Sc por pentoxido de antimonio hidratado (HAP), em meio HClO4 6M. Esses radioisotopos sao interferentes no espectro de raios gama do 153Gd e do 147Nd. A eficiencia do metodo foi testada por meio dos padroes geologicos BCR-1 e G-2 do U.S. Geological Survey. Discutem-se as limitacoes da analise por ativacao instrumental e as vantagens da separacao quimica, no caso dos dois elementos lantanidicos citados. (Autor)Original Title
Determinacao de neodimio e gadolinio em amostras geologicas por meio de analise por ativacao com neutrons
Primary Subject
Source
Jul 1982; 9 p; 32. Brazilian Congress of Chemistry; Belo Horizonte, MG (Brazil); 11 - 17 Oct 1981
Record Type
Report
Literature Type
Conference
Report Number
Country of publication
ACTIVATION ANALYSIS, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, CHEMICAL ANALYSIS, DAYS LIVING RADIOISOTOPES, ELECTRON CAPTURE RADIOISOTOPES, ELEMENTS, EVEN-ODD NUCLEI, GADOLINIUM ISOTOPES, INTERMEDIATE MASS NUCLEI, ISOTOPES, METALS, NEODYMIUM ISOTOPES, NUCLEI, RADIOISOTOPES, RARE EARTH NUCLEI, SEPARATION PROCESSES, SPECTRA
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