The results of an intercomparison exercise, designed for the determination of anthropogenic and natural radionuclides in sediment and fish samples from the Danube River, are reported. The methods of gross beta and gamma spectrometry measurements were compared. Considering the uncertainties of measurements, a good agreement between the results obtained by two laboratories has been ascertained.

1. G. Pantelic et al., “Radioactivity control of the Danube at Yugoslav-Hungarian border area,” Environmental Recovery of Yugoslavia, Vinca Institute, Belgrade, Serbia: 2002, pp. 193-201.
2. “Method for Determining Gamma Emitters,” Technical Reports Series: Measurements of Radionuclides in Food and Environment, no. 295, Vienna, Austria: IAEA, 1989, Annex I, pp. 47-69
3. J.D. Krneta Nikolic, D.J. Todorovic, M.M. Jankovic, G.K. Pantelic and M.M. Rajacic, “Quality Assurance and Quality Control in Environmental Radioactivity Monitoring,” Q. A. Safety Crops & Foods, vol. 6, no. 4,pp. 403-409, 2014.
   DOI: 10.3920/QAS2012.0.236
4. “IAEA Analytical Quality in Nuclear Applications Series: Worldwide Open Proficiency Test: Determination of Naturally Occurring Radionuclides in Phosphogypsum and Water,” IAEA, Vienna, Austria, no. IAEA/AQ/18 (IAEA-CU-2008-03), 2010.