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The radioactivity monitoring in the “Nikola Tesla”, “Kolubara”, “Morava” and  “Kostolac” coal-fired power plants was performed by the Radiation and  Environmental Protection Laboratory, Vinča Institute of nuclear sciences in  the period 2003-2010. Monitoring included the analysis of soil, water, flying  ash, slag, coal and plants. This paper presents the results of the  radioactivity analysis of coal, ash and slag samples. Naturally occurring  radionuclides 226Ra, 232Th, 40K, 235U, 238U, and 210Pb as well as the  man-made radionuclide 137Cs were determined by gamma spectrometry using HPGe  detector. The concentrations of pairs of radionuclides were statistically  tested to determine the correlation between them. Based on the obtained  results, health effect due to the activity of these radionuclides was  estimated via radium equivalent (Raeq), external hazard index (Hex), external  gamma absorbed dose rate () and annual effective dose

Analysis of natural radionuclides in coal, slag and ash in coal-fired power plants in Serbia