A significant dose contribution on the population could be derived from coal slags used as isolation material in buildings. Extremely high natural activities are measured in the coal slag from the region of Ajka, Hungary. The main conclusions based on the results of the monitoring of the gamma-dose rate and the radon concentration in the air in nearly 240 houses are as follows: - for individuals - e.g. children - spending a long time at home (19.2 h/day) the external annual dose is 1.7-4.5 mSv, - in the majority of houses with local slag the estimated annual average value of indoorradon concentration was above 400 Bq/m3, and in several cases there were buildings with values over 1200 Bq/m3. In these cases the internal annual dose of the dwellers can be estimated between 6-20 mSv, Due to the elevated gamma-exposure and the radon concentration in the dwellings the total annual dose was estimated as 8-24 mSv, more than 5-10 times the world average value. Some of the houses were built after the 1960s, when the use of slags from the region of Ajka as building material was already banned by the authorities. In addition to the regulations an effective radiological control should be introduced and a practice for testing the use of slag as building material.
|Number of pages||4|
|Journal||Magyar Kemiai Folyoirat, Kemiai Kozlemenyek|
|Publication status||Published - Oct 1 1997|
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