Publication: Estimación de la dispersión Compton en Fluorescencia de Rayos X: Aplicación al estudio de rocas carbonáticas
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1987
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Instituto Geológico y Minero de Españaa (Madrid)
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Abstract
Se describe un método, para la determinación de elementos traza por Fluorescencia de Rayos X, basado en la estimación de los coeficientes de absorción de masa (μ) en patrones de rocas carbonáticas a partir de la medida de la intensidad del pico denominado Compton con un tubo de wolframio. Este método permite, utilizando un patrón internacional (BCR-1), el análisis de elementos traza en sedimentos y rocas carbonáticas. Para el estroncio y el zinc, los errores tienen un valor máximo de ±5 por 100. En longitudes de onda superiores al eje de absorción del hierro, es necesario establecer una corrección basada en el contenido en hierro, lo que permite la determinación del hierro y manganeso. Este método tiene una limitación relacionada con el coeficiente de absorción de la muestra: no es aplicable a materiales con un μ muy bajos (μ¡,,9<7) o muy altos (μ¡.,9<20). No obstante, comúnmente los sedimentos y rocas carbonáticas presentan valores de μ incluidos en dicho rango.
An X-ray fluorescence method is described for the determination of trace elements. Mass absorption coefficients (μ) for reference standards (carbonate rocks) can be estimated by the use of measurements of the intensity of the Compton scattered portian of a Kka primary beam. The precise determination of mass absorption coefficients allows a single standard sample (BCR-1) to serve as a reference standard for the analysi sof trace elments in carbonate rocks. Overall errors in strontium and zinc analysis by the proposed method amount to aproximately ±5%. The practica! range extends from nickel to tin (Z=28 to Z=SO). For all wavelenghts longer than that of the iron absorption edge, a correction based on the iron content allows the analytical determination of iron and manganese. This method has a limitation related with the mass absorption coefficient of the sample: samples with very low μ (μ¡,,9<7) or very high μ (μ¡,,9>20) are excluded. Nevertheless, common carbonate sediments and rocks have values of μ included in this range.
An X-ray fluorescence method is described for the determination of trace elements. Mass absorption coefficients (μ) for reference standards (carbonate rocks) can be estimated by the use of measurements of the intensity of the Compton scattered portian of a Kka primary beam. The precise determination of mass absorption coefficients allows a single standard sample (BCR-1) to serve as a reference standard for the analysi sof trace elments in carbonate rocks. Overall errors in strontium and zinc analysis by the proposed method amount to aproximately ±5%. The practica! range extends from nickel to tin (Z=28 to Z=SO). For all wavelenghts longer than that of the iron absorption edge, a correction based on the iron content allows the analytical determination of iron and manganese. This method has a limitation related with the mass absorption coefficient of the sample: samples with very low μ (μ¡,,9<7) or very high μ (μ¡,,9>20) are excluded. Nevertheless, common carbonate sediments and rocks have values of μ included in this range.