Natural radiation in fly ashes from coal thermal power stations in Spain

Abstract Specific activity in samples of fly ashes from Spanish coal thermal power stations at Abono (Asturias), Andorra (Teruel), Alcudia (Mallorca) and Cercs (Barcelona) was analysed by gamma ray spectrometry. The values obtained permit us to quantify the presence of different natural radionuclides from 232 Th, 238 U, 235 U series and 40 K. The models are defined on the basis of these data to calculate the dosimetric impact caused by the use of fly ashes in the concrete.