Nataša Sarap's research while affiliated with Vinča Institute of Nuclear Sciences and other places
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Publications (28)
This work presents the natural radioactivity distribution of 21 surface soil samples taken in the city of Novi Sad, Serbia. The analysis for radioactivity was performed using a gas low-level proportional counter for gross alpha and gross beta activity, while the specific activities of radionuclides were determined using HPGe detectors. The gross al...
The procedure of radioactive standards preparation by spiking selected matrices with a certified mixture of radionuclides and its validation is presented in this paper. The uncertainty budget of standard total activity was elaborated in details. The experimentally obtained efficiency curves, as well as comparison with the curves obtained by the eff...
Simultaneous thermal analysis (TG–DTA) of low-rank coals from different annual periods (2015 and 2018) which originate from Kolubara and Nikola Tesla A (TENT A) coal-fired power plants was studied to identify their combustion characteristics and self-ignition risks. In order to investigate kinetics of thermo-oxidative degradation, model-free models...
Various imported building materials commonly used in construction and
industry in Serbia were analyzed using gamma spectrometry. Based on the
activity concentrations of 226Ra, 232Th, and 40K in the investigated samples,
radium equivalent activity, Raeq, absorbed dose rate, D, annual effective
dose, DE, and the external hazard index, Hex, were calcu...
Taking into account the importance of distribution and transfer of radionuclides in the soil–plant system, especially in agricultural fields, the aim of this research was assessment of radioactivity contribution and transfer characteristics of natural radionuclides in agroecosystem. The measurement of the natural radioactivity distribution was cond...
90Sr detection efficiency determination was applied for liquid scintillation counting (LSC) by computing a model for the relation between detection efficiency and the time passed since radiochemical separation. This allowed more flexibility in analysis times after separation as the model accounts for 90Y in-growth. Establishment of secular equilibr...
One of the main problems in quantitative gamma-ray spectroscopy is the determination of detection efficiency, for different energies, source-detector geometries, and composition of samples or sources. There are, in principle, three approaches to this issue: experimental, numerical, and semiempirical. Semiempirical approach is based on the calculati...
Kaolins are used in a multiplicity of industries because of unique physical and chemical properties. Relationships between thermal and radioactivity properties are discussed in its application as a building material. Super-fine kaolin powder with particle sizes about 30 μm was analyzed. Simultaneous TGA/DTA analysis was performed on powder samples...
Human activities may lead to increased levels of naturally occurring
radioactive material and heavy metals in waters relative to undisturbed
natural environment, consequently to reduced safety of environment.
Therefore, evaluation of water quality from coal-fired power plants is
essential to both environmental protection and protection of the human...
Investigation of the natural radioactivity levels in water around power plants, as well as in plants, coal, ash, slag and soil, and to assess the associated radiation hazard is becoming an emerging and interesting topic. This paper is focused on the results of the radioactivity analysis in waste water samples from five coal-fired power plants in Se...
The present paper focuses on the determination of radiological characteristics of cultivated chernozem soil and crops from long-term field experiments, taking into account the importance of distribution and transfer of radionuclides in the soil-plant system, especially in agricultural cropland. The investigation was performed on the experimental fi...
The results referring to radioactivity analysis in soil, water, plant, coal, slag and flying ash samples from the environment around two power plants “Nikola Tesla A” and “Kolubara” for 2015 are explained. The analysis of samples was performed by gamma spectrometry using HPGe detector. In the investigated soil, flying ash, slag and coal samples, na...
The results of an intercomparison exercise, designed for the determination of anthropogenic and natural radionuclides in sediment and fish samples from the Danube River, are reported. The methods of gross beta and gamma spectrometry measurements were compared. Considering the uncertainties of measurements, a good agreement between the results obtai...
This paper is focused on the results for activity concentrations of7Be in depositions recorded in Vinča Institute of Nuclear Sciences, as part of radioactivity monitoring in Institute from 1994 to 2013. year. Samples were collected on a monthly basis and activities were present on sampling day (middle of the month). The activities were determined o...
This study focuses on determination of soil to plant transfer factor (TF) of long lived radionuclides 90Sr and 137Cs. 90Sr and 137Cs activity concentration in agricultural soil samples was ranged between <0.3 and 1.3 Bq kg−1 and 14 and 30 Bq kg−1, from <2.6 to 7.2 Bq kg−1 and 5 to 13 Bq kg−1 fresh matter in roots and from 0.4 to 1.1 Bq kg−1 and <0....
This work presents a comprehensive study of natural radioactivity in 720 building materials imported in Serbia in 2012. Radioactivity concentrations of 226Ra, 232Th and 40K in the studied samples range from <5 to 4,938, <3 to 763 and <10 to 3,192 Bq kg−1, respectively. The maximum values of 226Ra and 232Th activity concentrations were found in zirc...
Measurement of the gross alpha and beta activity concentrations in various matrices is suitable as a preliminary screening procedure to determine whether further analysis related to specific radionuclide is necessary. In Serbia, according to current regulations, radioactivity concentrations in drinking water for gross alpha and gross beta should be...
The proposed and validated method for determination of Sr-90 content in environmental samples (water, soil and plant) is based on the radiochemical analytical separation of Y-90 from the sample and measuring its activity after the establishment of radioactive equilibrium with Sr-90. Validation is the confirmation by examination and provision of obj...
Abstract In the 1999 bombing of the Federal Republic of Yugoslavia, NATO forces used ammunition containing depleted uranium. The cleaning of depleted uranium that followed was performed in southern Serbia by the Vinča Institute of Nuclear Sciences between 2002 and 2007 at the locations of Pljačkovica, Borovac, Bratoselce, and Reljan. This paper pre...
Be-7, Pb-210 and Cs-137 activity concentrations in ground level air at five monitoring stations (MS Vinca, Zeleno Brdo, Zajecar, Vranje and Zlatibor) in Serbia were determined during the period from May 2011 to September 2012, as part of the Serbian monitoring project. Activity of the radionuclides in air was determined on a HPGe detector (Canberra...
Perturbation of the BrayLiebhafsky non-oscillating subsystem (mixture of KIO3 and H2SO4), i.e., Dushman reaction (DR), by piroxicam (PX), was observed in an open reactor, i.e., in the continuously fed well-stirred tank reactor (CSTR). Monitoring the response of DR to perturbations by different concentrations of PX allows developing a simple procedu...
A radiological characterization of 7 different carbonated mineral water samples collected in the local supermarkets in the area of Belgrade (produced in Serbia) was carried out. Analysis included determination of gross alpha and gross beta activities. The obtained results showed that the natural activity concentrations of alpha and beta emitting ra...
A radiological characterization of 7 different carbonated mineral water samples collected in the local supermarkets in the area of Belgrade (produced in Serbia) was carried out. Analysis included determination of gross alpha and gross beta activities. The obtained results showed that the natural activity concentrations of alpha and beta emitting ra...
A simple and reliable novel kinetic method for the determination of piroxicam (PX) was proposed and validated. For quantitative determination of PX, the Bray-Liebhafsky (BL) oscillatory reaction was used in a stable non-equilibrium stationary state close to the bifurcation point. Under the optimized reaction conditions (T = 55.0°C, [H2SO4]0 = 7.60×...
Citations
... The energy calibration is to obtain the radionuclide type for qualitative measurement, while the efficiency calibration determines the radionuclide activity for quantitative purposes. 152 Eu, 60 Co, and 137 Cs radioactive sources were used as authoritative sources for calibration (Vukanac et al. 2021). Using three familiar sources in this gamma spectroscopy calibration aims to obtain a more comprehensive coverage energy range. ...
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... DAEM was first introduced as a model-free approach to describe coal pyrolysis [32]. The basic assumption behind DAEM is existence of infinite parallel first-order reactions ...
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... Conducting nuclear tests, the use of radioactive sources not only in industry, but also in medicine, agriculture leads to significant changes in the radiation situation. Territories with a high content of not only artificial, but also natural radionuclides are beginning to appear [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. ...
... Scintillation cocktails necessary for liquid scintillation measurement of 90 Sr are concerned by REACH regulation [51] and should, shortly, be banned from laboratories or at least subject to derogation. In terms of measurement, Gačnik et al. [52] have compared limits of detection on 4 different samples measured by direct 90 Sr measurement with scintillation cocktail and by 90 Y indirect measurement with Cherenkov and they were 2 to 3 times lower for 90 Sr direct measurement. However, the sensitivity is mainly dependent on the type of counter (background count rate) and the time of acquisition [53] and can be optimised. ...
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... The determination of the activity for each radionuclide is performed using gamma spectrometry technique. The quantification of radionuclides requires a prior construction of full energy peak efficiency curve for a given large sample geometry, taking into account gamma self-absorption and coincidence summing effect corrections [5][6][7][8][9][10][11][12]. ...
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... Since the presence of these naturally occurring radioelements in the building and construction materials contributes to radiation exposure, information about the level of these natural radionuclides in building materials becomes very important in assessing the possible radiological hazards to human health. Knowledge about the concentration of these radionuclides is also very important in developing standards and rules that will help to check and manage the use of these mineral soils as building materials (Janković et al. 2018;Turhan 2009). ...
... The specific activity concentrations of Ra-226 in water samples ranged between 1.02 ± 0.11 and 2.76 ± 0.49 Bq kg −1 . In wastewater samples from power plants obtained by Janković et al. [32], the concentration of natural radionuclide Ra-226 was below the minimum detection activity (MDA). In comparison, the detected concentration of Ra-226 in drinking water in Pakistan varied within the range of 0.05-2.17 ...
... Similar studies were performed in other countries and the radioactivity levels in coal and soil samples were investigated to identify the radiological impact on human health. In some of these studies, the radionuclide concentrations were found higher than the recommended values having a potential radiological health impact on workers and the public (Makundi et al. 2018;Turhan et al. 2018;Kravchenko and Lyerly (2018), Janković et al. 2016, Lauer et al. 2015 and in some other studied, the levels were found well below the recommended values (Kolo et al. 2019(Kolo et al. , 2017Ćujić et al. 2015). ...
... In the case of undisturbed or uncultivated soil, the concentration of 137 Cs is generally higher in the surface profile (0-10 cm depth) and the migration is slow. The disturbed soil redistribution of this radionuclide is associated with mechanical mixing [23,47]. In [48], the radioactivity of soil samples in Vojvodina (the northern province of Serbia), including Novi Sad city, in 2001 and 2010 was examined. ...
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... Other waters investigated in this paper are not drinking water, but obtained values in analyzed samples for the gross alpha and beta activity are the same as in drinking water. For example in drinking mineral waters as well as in tap and spring water from Serbia, gross alpha and beta activity are within the recommended values of 0.5 and 1.0 Bq l -1 [20], [21]. Table 8 contains values for radioactivity concentrations in soil samples taken around coal fired power plants in different countries, as well as in Serbia but for soil samples taken in the city near power plant and also for soil samples taken from areas that are not related to power plants. ...
