Determination of Sr in Portuguese foodstuffs

Lopes, I.; Madruga, M. J.; Mourato, A.; Abrantes, J.; Reis, M.
November 2010
Journal of Radioanalytical & Nuclear Chemistry;Nov2010, Vol. 286 Issue 2, p335
Academic Journal
The Nuclear and Technological Institute (ITN) has the legal responsibility to carry out the environmental radiological monitoring at a national level. This survey was planned to provide relevant information on radioactivity levels in different components of the ecosystem. In what concerns the terrestrial environment the evaluation of the Sr activity concentrations in foodstuffs has been performed using a method based on the separation of Sr by extraction chromatography and beta determination by liquid scintillation counting (LSC) technique. The trials were carried out using 7 g of ash samples and 3 g of commercial Sr-resin (Eichrom). Validation trials were also performed using Sr spiked samples. The chemical yields were determined by gravimetric method, after the addition of stable strontium to the foodstuffs. The Sr activity concentrations in complete meals, meat and vegetables were determined after Y ingrowths in the region 12-862 keV, using the Tri-Carb 3170 TR/SL scintillation counter in normal mode and a counting time of 120 min. The results obtained were low and of the same order of magnitude of those reported by other European countries.


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