Neutron activation method for the determination of traces of cadmiun in aluminum
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El cadmio en aluminio de alta pureza se puede determinar en el rango de 1 p.p.b. rango por análisis de activación de neutrones. El método fue desarrollado específicamente para el análisis de aluminio destinado a ser utilizado en núcleos de reactores. Se llevaron a cabo irradiaciones simultáneas de muestras y estándares comparativos en el reactor NRX, Chalk River. La radiactividad inducida derivada de la impureza de cadmio se separó de la matriz mediante intercambio iónico y se purificó mediante precipitación utilizando portadores. Luego se contaron los radioisótopos de cadmio purificados para determinar la cantidad de radiactividad inducida y se calculó la concentración de cadmio en la muestra a partir de los resultados del conteo. Una sensibilidad de 17 p.p.b. se obtuvo fácilmente. La desviación estándar relativa fue &9.4%. Como la vida media de la radiactividad involucrada es moderadamente larga (53 horas), no es necesario realizar el análisis en el sitio del reactor.
Cadmium in high purity aluminum can be determined in the 1-p.p.b. range by neutron activation analysis. The method was developed specifically for the analysis of aluminum intended for use in reactor cores. Simultaneous irradiations of samples and comparative standards were carried out in the NRX reactor, Chalk River. The induced radioactivity derived from the cadmium impurity was separated from the matrix by ion exchange and purified by precipitation using carriers. The purified radioisotopes of cadmium were then counted to determine the amount of induced radioactivity and the concen’raiion of cadmium in the sample was calculated from the counting results. A sensitivity of 17 p.p.b. was readily obtained. The relative standard deviation was &9.4%. As the half life of the radioactivity involved is moderately long (53 hours), the analysis need not be made at a reactor site.
Cadmium in high purity aluminum can be determined in the 1-p.p.b. range by neutron activation analysis. The method was developed specifically for the analysis of aluminum intended for use in reactor cores. Simultaneous irradiations of samples and comparative standards were carried out in the NRX reactor, Chalk River. The induced radioactivity derived from the cadmium impurity was separated from the matrix by ion exchange and purified by precipitation using carriers. The purified radioisotopes of cadmium were then counted to determine the amount of induced radioactivity and the concen’raiion of cadmium in the sample was calculated from the counting results. A sensitivity of 17 p.p.b. was readily obtained. The relative standard deviation was &9.4%. As the half life of the radioactivity involved is moderately long (53 hours), the analysis need not be made at a reactor site.