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Pregled bibliografske jedinice broj: 211112

Zbornik radova

Autori: Petrinec, Branko; Franić, Zdenko
Naslov: Radiocezij u neobrađenom tlu na nekim lokacijama u Republici Hrvatskoj
( Radiocaesium in uncultivated soil on some locations in Croatia )
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 (ur.). - 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.-20.04.2005.
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.
Vrsta sudjelovanja: Predavanje
Vrsta prezentacije u zborniku: Cjeloviti rad (više od 1500 riječi)
Vrsta recenzije: Međunarodna recenzija
Projekt / tema: 0022001
Izvorni jezik: hrv-eng
Kategorija: Ostalo
Znanstvena područja:
Fizika,Geologija,Javno zdravstvo i zdravstvena zaštita



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