Production of spiked vegetation samples containing γ-emitting radionuclides for proficiency testing
The production of environmental reference materials such as soil, sediment, water and vegetation containing radionuclides for interlaboratory comparison is a vitally important contribution to environmental monitoring. Laboratories that carry out such monitoring need to demonstrate that their results are reliable. The IRD National Intercomparison Program (PNI) produces and distributes reference materials used to check laboratory performance. This work demonstrates the feasibility of producing vegetation (grass) samples containing 60Co, 65Zn, 134Cs, and 137Cs by the spiked sample method. The preparation and the statistical testing of the material followed ISO Guide 35 recommendations (ABNT ISO GUIA 35, 2012). Grass samples were prepared by two different spiking procedures. The activity concentration in the grass for each radionuclidehad a range of 593–683 Bq/kg with uncertainty between 0.6 and 6.2%. Both procedures showed similar results.
KeywordsSpiked sample Vegetation Interlaboratory comparison Radioactivity
To the Institute of Radioprotection and Dosimetry for the opportunity to carry out the work. To officials Mr. Eduardo and Johnny for the preparation of the sources and Mr. Octavio Trindade for analysis by Gamma Spectrometry. To CETEM, in the name of Dra Maria Alice Goes through the granulometric analysis.
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