RADIONUCLIDE CONTENT OF NORM BY-PRODUCTS ORIGINATING FROM THE COAL-FIRED POWER PLANT IN OROSZLANY (HUNGARY)

摘要

At the Thermal Power Plant in Oroszlany (Hungary), a huge amount of by-products have been produced since 1961. In this survey, coal and other by-products were examined (fly ash, bottom ash, fluidised bed bottom ash, gypsum and slurry-type ash). The natural isotopes were determined using an HPGe detector. It was found that the radionuclide content of coal was significantly lower (~(226)Ra = 45.3 ± 6.3, ~(232)Th = 26.3 ± 5.7 and ~(40)K = 210 ± 21 Bq kg~(-1)) than that in the case of ashes other than the fluidised type. The average values of the bottom ash-deposited in the largest quantities-were three times higher than those for coal (~(226)Ra = 144± 18, ~(232)Th = 84.3 ± 14 and ~(40)K = 260 ±25 Bq kg~(-1)). In the case of fractionised bottom ash, the radionuclide content of ＜0.1 mm was 45 % higher than that of ＞ 1.6 mm and the massic radon exhalation of ＜0.1 mm was approximately four times higher than that above this range.