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The study presented here, being its main goal to evaluate the behaviour of natural radionuclides in coal combustion, is part of a wider study carried out by CIEMAT and the University of Extremadura (UEX). The research is addressed to the radiological evaluation of the workers and the public as a result of the operation of the four biggest Spanish Coal-Fired Power Plants (CFPPs). Some generally used effects were confirmed in this study, as the difference in concentration of 210 Po in fly and bottom-ashes. Enrichment factors relative to 40 K as defined by UNSCEAR were found to be a little different than expected. 210 Po enrichment was found in gypsum (material obtained as a by-product in the desulphuration process). In order to confirm the assumption considered to explain difference in 232 Th activity concentration between bottom and fly ashes, carbon content was measured, obtaining that it should be reviewed.

Behaviour of natural radionuclides in coal combustion