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Master's Dissertation
DOI
10.11606/D.85.2013.tde-22082013-143640
Document
Author
Full name
Daniel Correa Puerta
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2013
Supervisor
Committee
Figueiredo, Ana Maria Graciano (President)
França, Elvis Joacir de
Saiki, Mitiko
Title in Portuguese
Aplicação do método k0-INAA no Laboratório de Análise por Ativação com Nêutrons do IPEN utilizando o programa k0-IAEA. Análise de amostras biológicas.
Keywords in Portuguese
amostra biológica
análise por ativação neutrônica
método dos três monitores descobertos
método k0-INAA
programa k0-IAEA
Abstract in Portuguese
Este estudo apresenta os resultados obtidos na aplicação do método de padronização k0-INAA no LANIPEN, para a análise de amostras biológicas, utilizando o programa k0-IAEA, fornecido pela Agência Internacional de Energia Atômica (IAEA). Os parâmetros de fluxo f e α do reator IEA-R1 do IPEN foram determinados na estação pneumática de irradiação e na posição de irradiação 24B/prateleira2, para irradiações curtas e longas, respectivamente. Para obter esses fatores, foi utilizado o chamado método bare triple-monitor com 197Au-96Zr- 94Zr. Para a verificação da precisão e exatidão do método, foram analisados os materiais biológicos de referência Peach Leaves (NIST SRM 1547), Mixed Polish Herbs (INCT-MPH-2) e Tomato Leaves (NIST SRM 1573a). Os critérios estatísticos Erro Relativo (bias, %), Coeficiente de Variação (CV) e U-score foram aplicados para avaliação dos resultados obtidos (média de seis replicatas). Os erros relativos (bias, %) ficaram, para maioria dos elementos, entre 0 e 30%, em relação aos valores certificados. Os Coeficientes de Variação foram inferiores a 20%, mostrando boa reprodutibilidade nos resultados obtidos experimentalmente. Os valores de U-score mostraram que todos os resultados, com exceção do valor para Na no Peach Leaves e no Tomato Leaves, estão dentro de um intervalo de confiança de 95%. Estes resultados apontam para uma promissora utilização do método k0-INAA no LAN-IPEN para a análise de amostras biológicas.
Title in English
k0-INAA application at IPEN Neutron Activation Laboratory by using the k0-IAEA program. Biological sample analysis
Keywords in English
bare triple-monitor
biological samples
k0-IAEA software
k0-INAA method
neutron activation analysis
Abstract in English
The results obtained in the application of the k0-standardization method at LAN-IPEN for biological matrices analysis, by using the k0-IAEA software, provided by the International Atomic Energy Agency (IAEA), are presented. The flux parameters f and α of the IEA-R1 reactor were determined for the pneumatic irradiation facility and for one selected irradiation position, 24B/shelf2, for short and long irradiations, respectively. In order to obtain these parameters, the bare triple-monitor method with 197Au-96Zr-94Zr was used. In order to evaluate the accuracy and precision of the methodology, the biological reference materials Peach Leaves (NIST SRM 1547), Mixed Polish Herbs (INCT-MPH-2) e Tomato Leaves (NIST SRM 1573a) were analyzed. The statistical criteria Relative Errors (bias, %), Coefficient of Variation (CV) and U-score were applied to the obtained results (mean of six replicates). The relative errors (bias, %) in relation to certified values, were, for most elements, in the range of 0 e 30. The Coefficients of Variation were below 20%, showing a good reproducibility of the results. The Uscore test showed that all results, except Na in Peach Leaves and in Tomato Leaves, were within 95% confidence interval. These results point out to a promising use of the k0-INAA method at LAN-IPEN for biological sample analysis.
 
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Publishing Date
2013-08-28
 
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