RESUMEN
The National Institute of Standards and Technology (NIST) Standard Reference Material (SRM) for seaweed was developed through an interlaboratory comparison with 24 participants from 16 countries. After evaluating different techniques to calculate certified values for the radionuclides, the median method was found to be the most representative technique. The certified values were provided for 13 radionuclides and information values were given for 15 more radionuclides. Results for the natural decay series showed disequilibrium in both the uranium and thorium series.
Asunto(s)
Guías como Asunto , Monitoreo de Radiación/normas , Radioisótopos/análisis , Radioisótopos/normas , Estándares de Referencia , Algas Marinas/química , Contaminantes Radiactivos del Agua/análisis , Cooperación Internacional , Dosis de Radiación , Monitoreo de Radiación/métodos , Valores de Referencia , Reproducibilidad de los Resultados , Sensibilidad y Especificidad , Contaminantes Radiactivos del Agua/normasRESUMEN
Five alpha spectrometry analysis algorithms were evaluated for their ability to resolve the 241Am and 243Am peak overlap present under typical low-level counting conditions. The major factors affecting the performance of the algorithms were identified using design-of-experiment combined with statistical analysis of the results. The study showed that the accuracy of the 241Am/243Am ratios calculated by the algorithms depends greatly on the degree of peak deformation and tailing. Despite the improved data quality obtained using an algorithm that may include peak addition and tail estimation, the accurate determination of 241Am by alpha spectrometry relies primarily on reduction of peak overlap rather than on algorithm selection.
