Naslov
Radiocezij u neobrađenom tlu na nekim lokacijama u Republici Hrvatskoj
(Radiocaesium in uncultivated soil on some locations in Croatia)

Autori
Petrinec, Branko ; Franić, Zdenko

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

Izvornik
Zbornik radova 6.simpozija Hrvatskog društva za zaštitu od zračenja = Proceedings of the Sixth Symposium of the Croatian Radiation Protection Association / Garaj-Vrhovac, Verica ; Kopjar, Nevenka ; Miljanić, Saveta - Zagreb : Hrvatsko društvo za zaštitu od zračenja, 2005, 345-350

Skup
Simpozij Hrvatskog društva za zaštitu od zračenja s međunarodnim sudjelovanjem (6 ; 2005)

Mjesto i datum
Stubičke Toplice, Hrvatska, 18.04.2005. - 20.04.2005

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Sažetak
Institute for Medical Research and Occupational Health carries out a programme of long-term monitoring of radioactive contamination of human environment in Croatia, which involves investigation of man-made fission radionuclides in soil. Contaminated soil can significantly increase exposure doses due to the indirect contamination of edible plants entering the human food chain. This article reports the specific activity of 137Cs in soil on two locations in Croatia monitored over the last decade. Soil samlples were taken from three different layers, 0-5 cm, 5-10 cm and 10-15 cm, in the cities of Zagreb and Zadar. A gamma-ray spectrometry system based on a low-level ORTEC Ge(Li) detector (FWHM 1.82 keV at 1.33 MeV) coupled to a computerized data acquisition system was used to determine radiocaesium levels in the samples from their gamma-ray spectra. The exponential decline was found in soil samples collected in Zadar with estimated ecological half-life of 13.5 years, whike nosuch behaviour was observed in the samples collected near Zagreb. Transient increases in 137Cs specific activity concentrations in Zagreb soil, such as those in 1997 and 2000, can only be partially explained by a variety of environmental physical factors that naturally fluctuate, which calls for futher investigations. As with time radiocaesium signal in undisturbed soils penetrated deeper layers, it would be appropriate to study deeper soil cores in the future. No direct correlation was foumd between fallout radioactivity and soil radioactivitybin the first layer. However, 137Cs activity concentrations in fallout could now be regarded as no more than background variations, having no deeper impact on the existing caesium levels in soil.

Izvorni jezik
Hrvatski, engleski

Znanstvena područja
Fizika, Geologija, Javno zdravstvo i zdravstvena zaštita

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