Naslov
Natural Radionuclides in Coal and Waste Material Originating from Coal Fired Power Plant

Autori
Marović, Gordana ; Franić, Zdenko ; Senčar, Jasminka ; Petrinec, Branko ; Bituh, Tomislav ; Kovač, Jadranka

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the 12th International Congress of the IRPA / - Buenos Aires : International Radiation Protection Association (IRPA), 2008

Skup
12th International Congress of the IRPA - Strengthening Radiation Protection Worldwide

Mjesto i datum
Buenos Aires, Argentina, 19.10.2008. - 24.10.2008

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Natural Radioactivity; Coal; Slag; Ash; Building Material

Sažetak
This paper presents long-term investigations of natural radioactivity in coal, used for power production in the coal-fired power plant (CFPP) situated on the Adriatic coast, and resulting slag and ash. Activity concentrations of 40K, 232Th, 226Ra and 238U in used coal and resulting waste material have been measured for 25 years. As expected, it was demonstrated that the content of radionuclides in deposited bottom and filter ash material are closely related with radionuclide activity concentrations and mineral matter fraction in used coals. The external hazard index has been calculated and discussed for the slag and ash depository. During the first decade of operation of the CFPP has been used domestic coal produced in nearby area characterized by higher background radiation compared with the rest of Croatia. Therefore, the coal itself had relatively high 226Ra and 238U activity concentrations while potassium and thorium content was very low, 40K activity concentrations being 2-9% and those of 232Th 1-3% of total activity. As, in addition, the sulphur concentrations in coal were very high use of domestic coal was gradually abandoned till it was completely substituted by imported coal originated from various sources and of low natural radioactivity. Upon this, activity concentrations of uranium series radionuclides in deposited waste materials decreased significantly. Consequently, waste material i.e., slag and ash, generated in the last several years of coal fired power plant operation could be readily used in cement industry and as additive to other building materials, without any special restrictions according to the Croatian regulations dealing with building materials and European directives.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Javno zdravstvo i zdravstvena zaštita

POVEZANOST RADA