Ivana Vukanac - Academia.edu (original) (raw)

Papers by Ivana Vukanac

Nuclear Technology and Radiation Protection, 2011

The direct measurement of 133Ba source activity by the application of the theoretical count rate ... more The direct measurement of 133Ba source activity by the application of the theoretical count rate equations has been recently developed by Novkovic et al. The analytical and Monte Carlo calculation of activity measurement uncertainties were described in previously published papers for the case of one recorded spectra. The procedure of uncertainty calculation for a sequence of successively recorded spectra, enabling the determination of the correlation between peak count rates, is presented in this paper. The uncertainty of activity obtained by the described method is caused by the uncertainty of the experimentally obtained input data and uncertainties of the used nuclear decay data.

Prikazan je pregled najnovijeg gama metoda za merenje ekshalacije radona iz građevinskih materija... more Prikazan je pregled najnovijeg gama metoda za merenje ekshalacije radona iz građevinskih materijala, koji pored ekshalacije omogućava merenje faktora emanacije i merenje difuzione dužine radona u datom materijalu, što nije moguće u standardnim merenjima ekshalacije radona. Takođe su prikazana i još tri standardna metoda merenja ekshalacije radona i dato je uporedno objašnjene prednosti i mana ovih metoda. Biće dat i pregled dosadašnjih merenja u Srbiji.A review of a new radon exhalation measurement method is presented. This method provides also a measurement of the radon diffusion length and the radon emanation coefficient, which is not possible by standard radon exhalation measurement methods. Besides, three standard radon exhalation measurements are presented: closed chamber with an active instrument, closed chamber with a solid state nuclear track detector and a charcoal canister method. An intercomparison of advantages and disadvantages is also given. A short review of previous ...

Radiation Physics and Chemistry, 2021

Abstract The procedure of radioactive standards preparation by spiking selected matrices with a c... more Abstract 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 efficiency transfer, are presented. Additionally, in order to confirm claimed homogeneity of prepared standard bulk materials, the efficiency versus density dependence for the individual gamma ray energies was checked for the same geometries and the results are presented. The results of the participation in recent IAEA PT scheme are discussed also.

International Journal of Environmental Research and Public Health, 2022

Doses from the exposure to outdoor radon are typically an order of magnitude smaller than those f... more Doses from the exposure to outdoor radon are typically an order of magnitude smaller than those from indoor radon, causing a greater interest on investigation of the latter for radiation protection issues. As a consequence, assessment of radon priority areas (RPA) is mainly based on indoor radon measurements. Outdoor radon measurements might be needed to guarantee a complete estimation of radiological risk and may help to improve the estimation of RPA. Therefore, authors have analysed the available literature on outdoor radon to give an overview of outdoor radon surveys and potential correlation with indoor radon and estimation of RPA. The review has shown that outdoor radon surveys were performed at much smaller scale compared to indoor radon. Only a few outdoor radon maps were produced, with a much smaller density, covering a larger area, and therefore putting doubt on the representativeness of this data. Due to a large variety of techniques used for outdoor radon measurements and...

Detection and measurement of uranium in environmental water is of primary importance for site mon... more Detection and measurement of uranium in environmental water is of primary importance for site monitoring in normal and incidental situation. Current recommended analytical methods for measurement of this parameter involve fluorimetry, mass spectrometry or possibly alpha spectrometry. As a proof of concept, taking benefit of the Gamma spectrometer large detection efficiency and very low background, detection limits for U in environmental water samples have been investigated. Values as low as, 44 mBq/L (i.e.  3.6 μg/L of U) have been obtained.

The methods that use scintillation counting with ZnS(Ag) scintillation detector are widely used f... more The methods that use scintillation counting with ZnS(Ag) scintillation detector are widely used for gross alpha activity determination. The common criteria for the selection of optimum counting condition for a ZnS(Ag) scintillation detector do not consider simultaneously operating voltage and discrimination level variation. In presented method a relationship between voltage and discrimination level is derived for counting efficiency.

Journal of Spectroscopy, 2018

One of the main problems in quantitative gamma-ray spectroscopy is the determination of detection... more 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 calculation of the efficiency for the measured sample on the basis of an experimental efficiency measured on the same detector, but with a calibration source that can be of different size, geometry, density, or composition—the so-called efficiency transfer. The aim of this paper is to analyze the semiempirical approach, using EFFTRAN and MEFFTRAN software as a typical example. These software were used in the Department of Radiation and Environmental Protection, Vinča Institute of Nuclear Sciences, on three HPGe detectors. The results were compared to the experimentally obtained efficiency, and further validation is performed by measuring reference ...

Journal Human Research in Rehabilitation, 2012

Artificial radionuclides are product of different human activities and their presence in the envi... more Artificial radionuclides are product of different human activities and their presence in the environment is negative side effect of civilization progress. They have been spread in the environment by events such as nuclear weapon tests, nuclear accidents and by deliberate and negligent discharge of radioactive waste from nuclear and other installation. Once released in to the nature, the artificial radionuclides start to circle in the same manner as naturally occurring ones, and finally they fall out from air and water onto the ground and build into the foodstuff and drinking water resulting in radiation doses to human beings. The short overview of presence of artificial radioactivity in human environment and its impact on human life is presented in this paper

Book of Abstracts, 2021

Various examination methods applied for the detection of pathological changes in the nasal mucosa... more Various examination methods applied for the detection of pathological changes in the nasal mucosa and patency of the nasal passages in patients with the reduced sense of smell ..

Journal of Environmental Radioactivity, 2019

The revised European Directive from 2013 regarding basic safety standard oblige EU Member States ... more The revised European Directive from 2013 regarding basic safety standard oblige EU Member States to establish a national action plan regarding the exposure to radon. At the same time, International Atomic Energy Agency started technical projects in order to assist countries to establish and implement national radon action. As a consequence, in recent years, in numerous countries national radon surveys were conducted and action plans established, which were not performed before. In this paper, a qualitative overview of radon surveys performed in Europe is given with a special attention to the qualitative and conceptual description of surveys, representativeness and QA/QC (quality assurance/quality control).

Applied Radiation and Isotopes, 2017

The results of peak analysis programs were tested on a statistical basis. Peak areas with a large... more The results of peak analysis programs were tested on a statistical basis. Peak areas with a large statistical uncertainty were tested for their trueness. The test was performed on five different programs for analyzing the spectra. It was found that peak areas with a large statistical uncertainty are too large. A way, how to calculate uncertainty-dependent correction factors is described.

Journal of Environmental Radioactivity, 2016

In the era of the energy saving policy (i.e. more air tight doors and windows), the radon exhaled... more In the era of the energy saving policy (i.e. more air tight doors and windows), the radon exhaled from building materials tends to increase its concentration in indoor air, which increases the importance of the measurement of radon exhalation from building materials. This manuscript presents a novel method of the radon exhalation measurement using only a HPGe detector or any other gamma spectrometer. Comparing it with the already used methods of radon exhalation measurements, this method provides the measurement of the emanation coefficient, the radon diffusion length and the radon exhalation rate, all within the same measurement, which additionally defines material's radon protective properties. Furthermore it does not necessitate additional equipment for radon or radon exhalation measurement, which simplifies measurement technique, and thus potentially facilitates introduction of legal obligation for radon exhalation determination in building materials.

Journal of Radioanalytical and Nuclear Chemistry, 2016

In order to compare three different techniques and estimate radiological impact, activity concent... more In order to compare three different techniques and estimate radiological impact, activity concentration of 210 Pb in coal, slag and ash samples from thermal power plant ''Nikola Tesla'', Serbia, were measured, and results are presented in this study. Determination of 210 Pb was carried out in three ways: using HPGe gamma spectrometer and via in-growth of 210 Po and 210 Bi by alpha-particle spectrometry and proportional counting, respectively. The results obtained for three different techniques were compared. Statistical analysis and comparison of methods were carried out by combination of Z score and v 2 statistical tests. Tests results, as well as values of measured activities concentrations obtained by alpha and gamma spectrometry, showed that gamma spectrometry is a valid alternative to time-consuming alpha spectrometry for low level activity measurements of 210 Pb. This remark is also valid even for gamma spectrometers with poor efficiency in low energy region. Keywords 210 Pb Á 210 Po Á 210 Bi Á Alpha-particle spectrometry Á Gamma-ray spectrometry Á Beta counting

Progress in Organic Coatings, 2013

ABSTRACT The effects induced by α-particles and laser beam irradiation in air atmosphere in uncur... more ABSTRACT The effects induced by α-particles and laser beam irradiation in air atmosphere in uncured and cured bisbenzocyclobutene (BCB) 2 μm thick films, spin-coated on glass/ITO surface have been investigated. α-Particle irradiation was done by means of a thin film 241Am source (Eα = 5.486 MeV), up to the total fluence of about 5 × 1010 particles/cm2. Laser irradiation was performed by a Nd3+:YAG (λ = 1.06 μm) laser in the free generation and the Q-switch regime, using both focused and unfocused beams. Irradiation induced changes were investigated using Light and Atomic Force Microscopy (AFM), infrared (IR), Ultraviolet/visible (UV/vis) and Raman spectroscopy by inspecting several uncured and cured BCB films before and after irradiation. It has been found that both types of irradiation under investigated conditions have produced a novel phase in the material, which is not present either in the uncured or the cured BCB films. Possible implications of the observed effects on curing and degradation of BCB films have been discussed.

Materiales de Construcción, 2018

The aim of this study was determination of physical-chemical and radiological characteristics of ... more The aim of this study was determination of physical-chemical and radiological characteristics of kaolin and products of alkali-activated thermally treated kaolin (geopolymer). Also, the objective of presented research was to investigate the possibility of kaolin application as a pigment or as a raw material for obtaining geopolymer materials as a relatively new ones in a building material industry. Physicochemical characterization of one set of samples was conducted using X-ray diffraction (XRD), Fourier transform infra - red (FTIR) and X-ray photoelectron spectroscopy (XPS). Activity concentration of naturally occurring radionuclides in kaolin, metakaolin and geopolymer were determined. The absorbed dose rate (D) and the annual effective dose rate (EDR), calculated in accordance with the UNSCEAR 2000 report, are also presented in this paper. Kaolin was heat-treated on 750oC and specific activity of natural radionuclide in metakaolin increased up to 1.6, while measured specific acti...

Nuclear Technology and Radiation Protection, 2021

Presented study deals with the final structure and radiological properties of different fly-ash b... more Presented study deals with the final structure and radiological properties of different fly-ash based geopolymers. Lignite fly-ash (lignite Kolubara ? Serbia) and wood fly ash were obtained in combustion process together with commercial fly-ash. Synthesis of the geopolymers was conducted by mixing fly-ash, sodium silicate solution, NaOH and water. The samples were strengthened 60 ?C for 48 hours after staying at room temperature in covering mold for 24 hours. The X-ray diffraction, Fourier transform infrared and SAM measurements were conducted on the samples after 28 days of geopolymerization process. The X-ray diffraction measurements of lignite fly-ash samples show anhydrite as the main constituent, while wood fly-ash samples consist of calcite, albite and gypsum minerals. Besides determination of physicochemical properties, the aim of this study was radiological characterization of lignite fly-ash, wood fly-ash and the obtained geopolymer products. Activity concentration of 40K a...

Journal of Radioanalytical and Nuclear Chemistry, 2020

The main goal of this study was the evaluation of physical-chemical, as well as radiological prop... more The main goal of this study was the evaluation of physical-chemical, as well as radiological properties of residual materials used for geopolymer synthesis and those final products as a possible application as new materials in a civil engineering industry. Concentration of 40 K and radionuclides from the 238 U and 232 Th decay series in waste precursors, their metaphases and geopolymer samples synthetized by alkali activation were determined together with corresponding absorbed dose rate (Ḋ) and the annual effective dose rate. Natural activity concentrations in the alkali-activated material (geopolymer) were found to be lower than that of both residual materials and calcined ones.