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Abstract. The aim of this paper was to investigate the activity concentration of natural radionuclides 40 137 Cs in the environment of Stara Planina Mountain was measured in soil (22 Bq/kg) from the area of Smilovci and moss (26 Bq/kg) from the area of Kamenica. Radiocesium was also detected in houseleek (5.7 Bq/kg), while in animal feed and dairy products the activity concentration was below the detection limit.

Activity concentrations of 40 K, 238 U, 232 Th and 137 Cs in the samples of cultivated and uncultivated soil, mosses, mushrooms and game meat (wild rabbit, pheasant and wild boar) are measured by the gamma spectrometry technique. The samples were collected in suburban areas of Belgrade, Serbia, in the period from 2008-2014. The mean activity concentrations of 40 K, 238 U and 232 Th in cultivated soil аre 637 Bqkg -1 , 52 Bqkg -1 and 53 Bqkg -1 , and in uncultivated soil 608 Bqkg -1 , 58 Bqkg -1 and 55 Bqkg -1 , respectively. An artificial radionuclide 137 Cs is detected in the samples of soil, mosses and mushrooms, which indicates that almost 30 years after the nuclear accident in Chernobyl, 137 Cs is still present in the environment. Since the activity concentrations of primordial radionuclides and 137 Cs in game meat are below detection limit, these samples can be classified as safe for consumption.

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Introduction. The aim of this study was to determine the content of radionuclides and toxic elements in samples feedstuffs and food of animal origin collected between 2007-2017 from two suburban areas of Belgrade, the municipalities of Palilula and Surčin, both areas with intensive agricultural production. Materials and Methods. Radionuclides (40 K and 137 Cs) and toxic elements (As, Cd, Cu, Ni, Pb and Zn) were determined in samples of corn, hay, meat, milk and eggs, by gamma ray spectrometry and inductively coupled plasma spectrometry (ICP-OES, Spectro Genesis). Results and Conclusions. The obtained results showed that natural 40 K was present in all investigated samples. The average activity concentration of 40 K was 94 Bq/kg in corn, 117 Bq/kg, 108 Bq/kg and 95 Bq/kg in beef, pork and chicken meat, respectively, as well as 61 Bq/kg in cow's milk and 48 Bq/kg in eggs. Anthropogenic radionuclide 137 Cs was not detected. The trend for toxic element levels according to the average concentrations found in the studied feed samples (corn and hay) was as follows: Zn>Cu>Pb>As>Ni>Cd. Arsenic was detected in animal feed in both Belgrade municipalities, with the average concentration being 1.08 mg/kg (0.5-1.37 mg/kg), and in corn, the As content was higher than in hay samples. In food of animal origin, only Zn and Cu were detected. It is concluded that the presence of radionuclides and toxic elements in feedstuffs and foods of animal origin does not pose a health risk for either humans or animals.

Abstract. Mineral additives, such as monocalcium phosphate, that are commonly used on pig farms, are obtained by processing phosphate mineral ore, and can contain high levels of 238 U. Since ingestion is the main route of radioactive contamination of both animals and humans, the goal of this paper is to measure specific activity of natural and artificial radionuclides in monocalcium phosphate and complete feed mixtures for pigs. Mineral additives with high levels of natural radionuclides can contaminate complete feed mixtures making them unsuitable for use. Samples were collected from three different farms, and in total fifteen samples of monocalcium and forty five samples of complete feed mixture were measured. Samples of monocalcium phosphate show the 238 U activity concentration of 13.2-2097Bq/kg. Other naturally occurring radionuclides are measured in monocalcium and the results give: 21.4-25.5 Bq/kg for 40 K, 1.5 -12.1 Bq/kg for 226 Ra, 1.5-2.9 Bq/kg for 232 Th, and 1.5-10.8 Bq/kg for 214 Bi. These radionuclides are further measured in complete feed mixtures and only one sample shows elevated concentrations of 238 U (3.1 Bq/kg) and 226 Ra (3.5 Bq/kg). Potassium-40 is detected in all samples, with the specific activity range 208-329 Bq/kg, while other naturally occurring radionuclides and artificial radioceasium are below the detection limits.

The aim of the study is the investigation of the activity concentration of 137 Cs and 40 K in blueberry-based products that are available on the market in the Republic of Serbia. Samples were bought in stores during September 2017 and in total, ten packaged juices, two jams, two sweets and a fresh wild blueberry were measured. The activity concentrations of 137 Cs in blueberry-based juices, jams and sweets varied from

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