J. Somlai et al., RADIATION-DOSE CONTRIBUTION FROM COAL-SLAGS USED AS STRUCTURAL BUILDING MATERIAL, Journal of radioanalytical and nuclear chemistry, 207(2), 1996, pp. 437-443
A significant dose contribution on the population could be derived fro
m coal slags used as isolation material. Extremely high natural activi
ties are measured in the coal slag, derived from the region of the set
tlement Ajka, Hungary. In some buildings monitored, the elevated gamma
-doses were nearly 5-10 times higher than the world average ones. The
annual average indoor radon concentrations from the slag exceeded 400
Bq/m(3) and in some cases up to 1200 Bq/m(3). Due to the elevated expo
sure and the radon concentrations in the dwellings the annual dose was
estimated to 8-24 mSv/y more than 5-10 times of the world average one
.