Publication: Calibración de radionucleidos mediante la técnica de recuento por centelleo líquido, recuento 2πα con cámara de ionización con reja y otras técnicas espectrométricas
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2022-02-02
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Universidad Complutense de Madrid
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Abstract
El objetivo de este trabajo ha sido la adaptación de la técnica de recuento por centelleo líquido 4παβ a la calibración de disoluciones de distintos radionucleidos, principalmente emisores de partículas alfa, dada su sencillez y rapidez en la obtención de resultados en comparación con otras técnicas que utiliza habitualmente el Laboratorio de Metrología de Radiaciones Ionizantes (LMRI) del CIEMAT para la calibración de estos radionucleidos. La combinación de esta técnica con otras ya existentes y empleadas en el LMRI, como es la medida 2πα en cámara de ionización con reja, ha permitido obtener la información necesaria que permita su aplicación, así como disponer de valores de referencia de las disoluciones estudiadas y de esta forma, validar los resultados obtenidos...
The objective of this work has been to set up the 4παβ liquid scintillation counting technique to the standardization of solutions of different radionuclides, mainly alpha-particle emitters, being a simple and quick technique compared to others usually used at the CIEMAT Ionizing Radiation Metrology Laboratory (LMRI) for the standardization of these radionuclides. The 4παβ liquid scintillation counting technique has been used in combination with others currently used in LMRI, such as 2πα counting with grid ionization chamber, to obtain the information and reference values of the solutions activity concentration needed to apply and validate this technique. The results obtained by 4παβ liquid scintillation counting have been compared with those obtained using 2πα counting with grid ionization chamber. The simplest standardizations were performed over four 241Am solutions with a single alpha-emitting nuclide; two 243Am solutions also containing the beta-emitting descendant 239Np in radioactive equilibrium; and a 242Pu solution with impurities of other alpha- and beta-emitting plutonium isotopes but whose isotopic composition is known. In all cases, the results obtained by both techniques overlap in their respective uncertainty intervals, thus validating the standardization of these solutions by liquid scintillation counting...
The objective of this work has been to set up the 4παβ liquid scintillation counting technique to the standardization of solutions of different radionuclides, mainly alpha-particle emitters, being a simple and quick technique compared to others usually used at the CIEMAT Ionizing Radiation Metrology Laboratory (LMRI) for the standardization of these radionuclides. The 4παβ liquid scintillation counting technique has been used in combination with others currently used in LMRI, such as 2πα counting with grid ionization chamber, to obtain the information and reference values of the solutions activity concentration needed to apply and validate this technique. The results obtained by 4παβ liquid scintillation counting have been compared with those obtained using 2πα counting with grid ionization chamber. The simplest standardizations were performed over four 241Am solutions with a single alpha-emitting nuclide; two 243Am solutions also containing the beta-emitting descendant 239Np in radioactive equilibrium; and a 242Pu solution with impurities of other alpha- and beta-emitting plutonium isotopes but whose isotopic composition is known. In all cases, the results obtained by both techniques overlap in their respective uncertainty intervals, thus validating the standardization of these solutions by liquid scintillation counting...
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Tesis inédita de la Universidad Complutense de Madrid, Facultad de Ciencias Químicas, leída el 03-11-2021