Estudio sobre la factibilidad de empleo del análisis por activación neutrónica en cerámicos arqueológicos enteros
Date
2009-04-01
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Abstract
Se ha estudiado la factibilidad de utilización del análisis por activación neutrónica instrumental de
objetos cerámicos enteros, empleando flujos neutrónicos térmicos bajos. El estudio toma en cuenta
los elementos químicos relevantes para las investigaciones arqueológicas, así como el grado de
exactitud requerido. Se demuestra que después de una irradiación de un objeto cerámico típico con
una masa del orden de 1 kg durante 45 minutos, a un flujo neutrónico térmico del orden de 109
n.cm-2.s-1, se obtienen, por espectrometría gamma, señales analíticas con estadísticas de medición
mejores que 1%, para 76As, 131Ba, 141Ce, 60Co, 134Cs, 181Hf, 140La, 24Na, 122Sb, 46Sc, 153Sm y 233Pa, mientras que 51Cr, 152Eu, 42K, 86Rb, 175Yb y 65Zn pueden ser detectados con estadísticas de medición del
orden de 1% a 2%. Por otro lado, las estadísticas de medición para 177Lu, 147Nd, 239Np, 160Tb y 181Ta
son relativamente pobres, con órdenes entre 3% y 10%. Se discute la posibilidad de realización de
determinaciones cuantitativas confiables, teniendo en cuenta la complejidad del análisis de los objetos cerámicos enteros, que involucra factores tales como masas relativamente altas, al igual que
formas asimétricas y variables.
The feasibility of the instrumental neutron activation analysis of entire pieces of archaeological pottery, using low thermal neutron fluxes, is examined. The study takes in account the chemical elements relevant for archaeological investigations, as well as the degree of accuracy required for such kind of research. It is shown that after irradiation of a typical pottery sample of about 1 kg for 45 minutes, at a thermal flux of about 109 n.cm-2.s-1, analytical signals are obtained, by gamma spec- trometry,, with counting statistics better than 1%, for 76As, 131Ba, 141Ce, 60Co, 134Cs, 181Hf, 140La, 24Na, 122Sb, 46Sc, 153Sm y 233Pa, mientras que 51Cr, 152Eu, 42K, 86Rb, 175Yb y 65Zn whereas 51Cr, 152Eu, 42K, 86Rb, 175Yb y 65Zn can be detected with counting statistics within 1% and 2%. On the other hand, the statistics of measurement are relatively poor (orders of 3% - 10%) for 177Lu, 147Nd, 239Np, 160Tb y 181Ta. The feasibility of accomplishment of reliable quantitative determinations, taking in account the complexity of the analysis of entire pieces of archaeological pottery is discussed, which involves factors such as high masses, as well as asymmetric and variable shapes.
The feasibility of the instrumental neutron activation analysis of entire pieces of archaeological pottery, using low thermal neutron fluxes, is examined. The study takes in account the chemical elements relevant for archaeological investigations, as well as the degree of accuracy required for such kind of research. It is shown that after irradiation of a typical pottery sample of about 1 kg for 45 minutes, at a thermal flux of about 109 n.cm-2.s-1, analytical signals are obtained, by gamma spec- trometry,, with counting statistics better than 1%, for 76As, 131Ba, 141Ce, 60Co, 134Cs, 181Hf, 140La, 24Na, 122Sb, 46Sc, 153Sm y 233Pa, mientras que 51Cr, 152Eu, 42K, 86Rb, 175Yb y 65Zn whereas 51Cr, 152Eu, 42K, 86Rb, 175Yb y 65Zn can be detected with counting statistics within 1% and 2%. On the other hand, the statistics of measurement are relatively poor (orders of 3% - 10%) for 177Lu, 147Nd, 239Np, 160Tb y 181Ta. The feasibility of accomplishment of reliable quantitative determinations, taking in account the complexity of the analysis of entire pieces of archaeological pottery is discussed, which involves factors such as high masses, as well as asymmetric and variable shapes.
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análisis por activación neutrónica, cerámicos arqueológicos, muestras grandes, neutron activation analysis, archaeological ceramics, large samples
Citation
Proyecciones, Vol.7 No.1
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