Determination of 90Sr in Portuguese foodstuffs |
| |
Authors: | I Lopes M J Madruga A Mourato J Abrantes M Reis |
| |
Institution: | 1. Nuclear and Technological Institute/Radiological Protection and Safety Unit, E.N. 10, 2686-953, Sacavém, Portugal
|
| |
Abstract: | 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 90Sr activity concentrations in foodstuffs has been performed using a method based on the separation of 90Sr 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 90Sr spiked samples. The chemical yields were determined by gravimetric method, after the addition of stable strontium to the foodstuffs. The 90Sr activity concentrations in complete meals, meat and vegetables were determined after 90Y 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. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|