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AbstractAbstract
[en] A method to determinate the elements thorium and uranium by X-rays fluorescence in ores and derivatives is presented. The chosen samples are ores from Morro do Agostinho, Pocos de Caldas, Minas Gerais and monazite concentrated from Nucleomon which has the feature of being complex, and which is a type of material frequently found in nuclear technology. The method of fusion is chosen to prepare the samples, in which they are fused in borax in its natural form thus, proposing analyses of those elements without any previous chemical treatment. In the analyses of uranium, the effect of absorption of iron existing in the distinctive line ULα (n=2) of second order is mathematically corrected, instead of baing eliminated by chemical separation. The determination of thorium is made through the method of double-dilution in which several reasons have shown the advantages of its employment. The precision in function the coefficient of variation in percentage and the accuracy of the method proposed are discussed
[pt]
Apresenta-se, um metodo para a determinacao dos elementos uranio e torio por fluorescencia de raios-X em minerios e derivados. As amostras escolhidas sao dos minerios do Morro do Agostinho, Pocos de Caldas, Minas Gerais e concentrado de Monazita da Nucleomon, cuja caracteristica e a sua complexidade, tipo de material frequentemente encontrado na tecnologia nuclear. Para a preparacao de amostras optou-se pela fusao, onde a amostra e fundida em borax na sua forma natural, propondo-se assim, analises daqueles elementos sem tratamento quimico. Na analise de uranio, o efeito de absorcao de ferro presente na linha caracteristica ULα de segunda ordem foi corrigido matematicamente, no lugar de sua eliminacao por separacao quimica. A determinacao de torio realizaou-se pelo metodo de dupla-diluicao, onde diversas razoes mostram vantagens de sua utilizacao. Discute-se a precisao em funcao do coefidiente de variacao porcentual e exatidao do metodoOriginal Title
Determinacao de uranio e torio por fluorescencia de raios-X em minerios e derivados
Primary Subject
Secondary Subject
Source
IEA Dissertacao e Tese; no. 120; Jan 1979; 60 p; Tese (M.Sc.).
Record Type
Report
Literature Type
Thesis/Dissertation; Numerical Data
Report Number
Country of publication
ACTINIDE COMPOUNDS, ACTINIDES, CHEMICAL ANALYSIS, DATA, DATA FORMS, DEVELOPING COUNTRIES, ELEMENTS, INFORMATION, METALS, MINERALS, NONDESTRUCTIVE ANALYSIS, NUMERICAL DATA, ORES, OXYGEN COMPOUNDS, PHOSPHATES, PHOSPHORUS COMPOUNDS, RADIOACTIVE MATERIALS, RADIOACTIVE MINERALS, RARE EARTH COMPOUNDS, SOUTH AMERICA, THORIUM COMPOUNDS, THORIUM MINERALS, THORIUM PHOSPHATES, TRANSITION ELEMENTS, X-RAY EMISSION ANALYSIS
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