hrvatski

PRIRODNA RADIOAKTIVNOST U PODZEMNIM VODAMA U OKOLIŠU TE PLOMIN

Coal fired power plant Plomin (CFPP) is situated some eight kilometres from the city of Labin, Istria, Croatia. The CFPP started with production in 1970 and up to year 1990 the coal, which had higher natural radioactivity was used. The ash and slag from the production were deposited at the deposition site in the vicinity of the CFPP. In 1990 the deposition site was remediated, which included foil protection, covering with soil and construction of rain and groundwater drainage. To control the permeability of isolating layers, there is a constant control of groundwater radioactivity. In this paper we report the results of the natural radioactivity of groundwater, sampled during 2013, 2014 and 2015. The groundwater was sampled from 6 piezometers surrounding the deposition site. Activity concentrations of natural radionuclides were determined using high resolution gamma spectrometry (for 238 U, 235 U, 226 Ra, 232 Th, 210 Pb i 40 K). Additionally, radiochemical method for determination of 226 Ra was used. The results show there is no radioactive contamination of groundwater in the surroundings of the deposition site. The activity concentrations were in accordance with results obtained in previous investigations (2004, 2006). There are some small variations in activity concentrations, so continuous monitoring of groundwater in the area of the CFPP is necessary.

radioaktivnost, ground water, coal fired power plant

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