Vladimir M Markovic

University of Kragujevac · Faculty of Science, Department of Physics

Wave optics based theoretical model of light propagation through the track structure in a solid-state nuclear track detector was developed in this article. When coherent and monochromatic light passes through the track structure, diffraction rings are formed around track opening. The distribution of the light intensity (diffraction pattern) from th...

Cylindrical diffusion chamber with solid state nuclear track detector placed at the bottom of the chamber is frequently used device for measuring radon concentration in dwellings. In this work, the diffusion chamber with CR-39 detector was modeled to determine track distribution on the lateral (cylinder) wall of the chamber and compare track densit...

The aim of this study was to investigate spatial distribution of alpha particle tracks produced by radon and its progeny in radon diffusion chambers. Three cylindrical chambers equipped with CR-39 detectors were used in the experiment. Radon concentration was estimated using RAD7 device. Distribution of alpha particle tracks on detector surface was...

Knowledge of microdosimetric quantities of certain radionuclides is important in radio immune cancer therapies. Specific energy distribution of radionuclides, which are bound to the cell, is the microdosimetric quantity essential in the process of radionuclide selection for patient tumour treatment. The aim of this paper is to establish an applicab...

The first step in every systematic approach to investigating population exposure to radon on a national level is to perform a comprehensive indoor radon survey. Based on the general knowledge of the radon levels in Serbia and corresponding doses, the results obtained from a national indoor radon survey would allow policy-makers to decide if it is n...

The elementary system which can emit light is a dipole. Theoretical method of light propagation from point like dipole source is presented in this paper. The propagation is considered through two media divided by 3D arbitrary surface. Orientation of new formed dipole on surface segment is determined according to the refraction of incident wave-fron...

A propagation numerical method for determining energy eigenvalues and eigen wave functions for hydrogen atom in constant and uniform electric field is described in this paper. Solution is presented for 3-D Schroedinger equation in natural parabolic co-ordinate system. Criteria for accepting eigenvalues are introduced, and results are compared with...

Diffusion chamber with SSNTD (Solid State Nuclear Track Detector) placed inside is a passive detector for measuring the activity of ²²²Rn and ²²⁰Rn (radon and thoron) and their progenies. Calibration from detected alpha particle tracks to progeny activity is often acquired from theoretical models. One common assumption related to these models found...

Diffraction phenomena have a special importance in optics. Due to their complex nature, diffraction problems cannot be solved exactly using an analytical approach for the general case. Problems for which an exact analytical solution can be found are reduced to simple ones, with a great deal of symmetry of obstacles and slits where the diffraction o...

In this paper diffusion of radon isotopes ²²²Rn and ²²⁰Rn is considered in diffusion chamber which is covered with radon soluble membrane. Diffusion is considered in two mediums, membrane and air inside of diffusion chamber. Analytical and numerical solutions are presented and time dependence of total activity inside of chamber is determined. Prese...

The method for determination of diffraction pattern for irregular 3D objects with application on rotated conical tracks in solid state nuclear track detector (SSNTD) wasdescribed in this paper. The model can be applied for different types of the diffraction (Fresnel, Fraunhofer) and arbitrary shapes of the obstacle. By applying the developed model...

Radon problem has a special attention in many countries in the world and the most of them have established national radon programmes. The radon issues in Serbia have not been approached in a systematic and organized way. Currently, there are many research groups and institutions working in radon field, and it is a good basis to integrate all these...

Invited lecture in V International Congress BIOMEDICINE AND GEOSCIENCES - INFLUENCE OF ENVIRONMENT ON HUMAN HEALTH Hotel Crowne Plaza, Belgrade, 3-4 March 2015

The Boron Neutron Capture Therapy (BNCT) is based on selective uptake of boron in tumour tissue compared to the surrounding normal tissue. Infusion of compounds with boron is followed by irradiation with neutrons. Neutron capture on 10B, which gives rise to an alpha particle and recoiled 7Li ion, enables the therapeutic dose to be delivered to tumo...

Monte Carlo simulations were performed to evaluate dose for possible treatment of cancers by boron neutron capture therapy (BNCT). The computational model of male Oak Ridge National Laboratory (ORNL) phantom was used to simulate tumours in the lung. Calculations have been performed by means of the MCNP5/X code. In this simulation, two opposite neut...

Total number and angular albedo were calculated for commonly used shielding materials, water, concrete, and iron, for photons with initial energies from 10 keV up to 10 MeV and normal incident angle. Influence of material thickness on total number albedo was also investigated. Double differential albedo was determined from simulation of photon tran...

The use of beta radionuclides for treatment in radiotherapies leads for a need of better understanding of interactions and local energy depositions of beta particles within tissue and tissue equivalent media. The aim of this work is to determine microdosimetric quantities for various radionuclides. Specific energy, z, and its distribution, $ f(z)...

Total number and angular albedo were calculated for commonly used shielding materials, water, concrete, and iron, for photons with initial energies from 10 keV up to 10 MeV mal incident angle. Influence of material thickness on total number albedo was also investigated. Double differential albedo was determined from simulation of photon transport t...

Radon, 222Rn, is radioactive noble gas which decays by alpha emission with half-life of 3.825 d. Its short-lived progeny, 218Po, 214Pb and 214Bi (214Po), are alpha and beta radioactive and they emit gamma radiation as well. Radon progeny can be inhaled by humans where they deposit on the inner layers of bronchi, and bronchioles. Particles (alpha, b...

Great deal of work has been devoted to determine doses from alpha particles emitted by (222)Rn and its progeny. In contrast, contribution of beta particles and following gamma radiation to total dose has mostly been neglected so far. The present work describes a study of the detriment of (222)Rn progeny for humans due to external exposure. Doses an...

In this paper the stopping power was calculated, representing the electrons of the tar get atom as an assembly of quantum oscillators. It was considered that the electrons in the at oms have some velocity before interaction with the projectile, which is the main contribution of this paper. The influence of electron velocity on stop ping power for d...

Great deal of work has been devoted to determine doses from alpha particles emitted by (222)Rn and (220)Rn progeny. In contrast, contribution of beta particles to total dose has been neglected by most of the authors. The present work describes a study of the detriment of (222)Rn and (220)Rn progeny to the human lung due to beta particles. The dose...

Beta and gamma dose assessment due to radon short lived progeny V.M. Markovic N. Stevanovic, and D. Nikezic University of Kragujevac, Faculty of Science, R. Domanovica 12 34000 Kragujevac, Serbia The most significant radiation hazard for human population (over 50 %) comes from radon (222Rn) and its short lived progeny (NCRP Report 93, 1987; ICRP...

This work consists of two parts. In the first part, the doses in the human lung per unit exposure to thoron progeny, the dose conversion factor (DCF), was calculated. Dependence of the DCF on various environmental and subject-related parameters was investigated. The model used in these calculations was based on ICRP 66 recommendations. In the secon...

A great deal of work has been devoted to determine the effect of tissue damage produced by alpha particles emitted from radon and its progeny. 214Pb and 214Bi deposited in the human lungs emit beta particles followed by the gamma quanta, which cause smaller damage of tissue in comparison with alpha particles. Because of that, this type of irradiati...

In this paper deposition rate coefficients for unattached and attached radon progeny were estimated according to a particle deposition model for turbulent indoor airflow described by Zhao and Wu [2006. Modeling particle deposition from fully developed turbulent flow in ventilation duct. Atmos. Environ. 40, 457-466]. The parameter which characterize...

Parameters of the Jacobi room model were estimated with simulation of Brownian motion. Deposition on internal room surfaces and attachment of progeny atoms to three modally distributed aerosols were taken into account. The values of parameters were presented as functions of aerosol concentrations. The deposition rate of an unattached progeny was es...

The absorbed fractions (AF) of electrons in sensitive layers of human respiratory tract were calculated in this paper. For that purpose the source code for simulation package PENELOPE, based on Monte Carlo method, was developed. The human respiratory tract was modeled according to ICRP66 publication, where AF of electrons was calculated using EGS4...