Miroslav Veskovic - Academia.edu (original) (raw)

Papers by Miroslav Veskovic

AIP Conference Proceedings, 2007

ABSTRACT Contemporary theories of dark matter predict that weakly interacting massive particles i... more ABSTRACT Contemporary theories of dark matter predict that weakly interacting massive particles interact with matter by nuclear recoils leaving in the detector energies up 50 keV. The bremsstrahlung of 210Pb contributes to this spectral region. The 46.5 keV gamma intensity of 210Pb in the background can be easily reduced by inner lining, but the bremsstrahlung from the 1.2 MeV maximal energy beta decay will reach the lead shielded Ge detector. The spectrum of this bremsstrahlung is calculated by numerically fitting the beta spectrum and integrating the Koch-Motz formula. The absorption of the bremsstrahlung spectrum in the lead and detection efficiencies for Ge detector are calculated by the effective solid angle algorithm, using correction for photopeak/compton ratio of cross sections in Ge. By comparison with the measured spectrum, it is shown, that for the lead with 25 Bq/kg of 210Pb, up to 500 keV, the bremsstrahlung contribution to the background is about 20%. The calculated bremsstrahlung intensity is in good agreement with the experimental result derived in Max Planck Institute, Heidelberg..

Physical Review Letters, 2000

The first fully on-line use of the angular distribution of beta emission in detection of NMR of n... more The first fully on-line use of the angular distribution of beta emission in detection of NMR of nuclei oriented at low temperatures is reported. The magnetic moments of the single valence particle, intermediate mass, isotopes 67 Ni͑np 21 1͞2 ; 1͞2 2 ͒ and 69 Cu͑pp 1 3͞2 ; 3͞2 2 ͒ are measured to be 10.601͑5͒ m N and 12.84͑1͒ m N , respectively, revealing only a small deviation from the neutron p 1͞2 single-particle value in the former and a large deviation from the proton p 3͞2 single-particle value in the latter. Quantitative interpretation is given in terms of core polarization and meson-exchange currents.

AIP Conference Proceedings, 2009

ABSTRACT Cosmic-rays induced neutrons can produce measurable activity in carefully selected mater... more ABSTRACT Cosmic-rays induced neutrons can produce measurable activity in carefully selected materials used for construction of low-background gamma spectroscopy systems. In order to improve shielding of low-background systems, flux of neutrons inside the shield and level of induced activity should be measured.

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2007

Radon is a naturally occurring radioactive gas. Radon is the alpha emitter and decays to short-li... more Radon is a naturally occurring radioactive gas. Radon is the alpha emitter and decays to short-lived daughters (Po, Pb, Bi and Po). Radon partially decays in material where it has been generated and partially moves rapidly by concentration-driven diffusion into the open air. The presence of determined radon activity concentration in the atmosphere is the natural contamination. Sources of radon in flats are: soil under and round the object, building’s material and water and gas used in household. Radon is entering the home by emanation from walls, floor and ceiling, through underlying soil and from things and materials that are in the room. Underlying soil is the main source of indoor radon. However, building’s materials also may contribute to elevated indoor radon concentration, especially in combination with low ventilation. In this paper the results of the first radon mapping in Vojvodina are presented Indoor radon activity concentration in air has been measured at the whole area ...

cdsweb.cern.ch

It is proposed to measure the magnetic moment of 49 Sc by the Nuclear Magnetic Resonance on Orien... more It is proposed to measure the magnetic moment of 49 Sc by the Nuclear Magnetic Resonance on Oriented Nuclei (NMR-ON) method using the NICOLE on-line nuclear orientation facility. 49 Sc is the neutron rich, doubly closed-shell, nucleus 48 Ca plus one proton. Results will be used to deduce the effective g-factors in the 48 Ca region with reference to nuclear structure and meson exchange current effects.

Der Donauraum, 2012

„Die EU-Strategie für den Donauraum (EUSDR) ist eine makroregionale Strategie, die im Dezember 20... more „Die EU-Strategie für den Donauraum (EUSDR) ist eine makroregionale Strategie, die im Dezember 2010 von der Europäischen Kommission verabschiedet und 2011 vom Europäischen Rat gebilligt wurde. Die Strategie wurde von der Kommission gemeinsam mit den Staaten und relevanten Akteuren der Donauregion entwickelt, um verbreitet auftretende Herausforderungen gemeinsam zu bewältigen. Die Strategie soll für die im gesamten Donauraum bereits existierenden Maßnahmen und Initiativen Synergien schaff en und Kooperationen bewirken. Bei der Strategie geht es nicht um Finanzierung, sondern um engere Zusammenarbeit!“1

concentration measurements of: radon emanated from the soil, radionuclides 226 Ra, 232 Th and 40 ... more concentration measurements of: radon emanated from the soil, radionuclides 226 Ra, 232 Th and 40 K in the soil, indoor radon in the city of Novi Sad (the capital city of Vojvodina) using charcoal canisters and indoor radon in the Vojvodina region using alpha-track detectors and the radioactivityof some building materials. Influences of floor level, space under the rooms, boarding, and the heating system on indoor radon accumulation in the Vojvodina province, situated in the northern part of Serbia, are also presented in this paper. The total effective dose and the activity concentration index are calculated applying the dose criteria recommended by the European Union for building materials.

Journal of Radioanalytical and Nuclear Chemistry, 2014

The contents of natural radionuclides (226Ra, 232Th and 40K) in 33 fertilizers and 50 soil sample... more The contents of natural radionuclides (226Ra, 232Th and 40K) in 33 fertilizers and 50 soil samples from Vojvodina region, Serbia, were measured by low level gamma spectrometry. The obtained results showed that the averages of radiation hazard parameters for the fertilizers are higher than acceptable level for radium equivalent activity (Raeq), representative level index (Iγ), external hazard index (Hex) and absorbed dose rate (D) [1]. Based on the measured values of the activity concentration of radionuclides in soils, the activity concentrations of radionuclides for most commonly grown crops in Vojvodina were calculated.

AIP Conference Proceedings

The features of the ground located gamma ray spectrometer shielded passively with 12 cm of lead a... more The features of the ground located gamma ray spectrometer shielded passively with 12 cm of lead and actively by five 0.5 m× 0.5 m× 0.05 m plastic veto shields are described. The detector mass related background was 0.345 C/kg s. The 511 keV annihilation line was ...

AIP Conference Proceedings, 2007

ABSTRACT Nineteen years after Chernobyl nuclear accident, activity concentration of 137Cs still c... more ABSTRACT Nineteen years after Chernobyl nuclear accident, activity concentration of 137Cs still could be detected in food and soil samples in Central and Eastern Europe. In this paper radiation levels of radium and cesium in Lucerne will be presented. It is a perennial plant with a deep root system and it is widely grown throughout the world as forage for cattle. The samples of Lucerne were taken from twelve different locations in Vojvodina in the summer period July-September 2004. The samples were specially dried on the air and after that ground, powdered and mineralized by method of dry burning on the temperature of 450°C. Gamma spectrometry measurements of the ash were performed by means of actively shielded germanium detector with maximal background reduction. For cesium 137Cs 10 mBq/kg order of magnitude detection limits were achieved.

AIP Conference Proceedings, 2007

ABSTRACT Overview of new educational program and training in Medical Physics at the University of... more ABSTRACT Overview of new educational program and training in Medical Physics at the University of Novi Sad is presented, where the medical physics education from undergraduate to doctoral study is established in the last decade. Necessity for basic and additional education and hospital training for medical physicists becomes the evident subject in clinical practice in which physicists and physicians are in close collaboration to ensure high quality of patient care. Learning objectives: to incorporate the latest scientific and professional findings in the field of medical physics, medical diagnostics, therapy and instruments; to accomodate students' pursuits of individual fields by offering elective courses from different areas of current medical practice; to reflect the multidisciplinary spirit of the studies, since teaching is performed by experts from diverse fields.

AIP Conference Proceedings, 2009

The MIREDO (Muon Induced Rare Event Dynamic Observatory) spectrometer system will be mainly devot... more The MIREDO (Muon Induced Rare Event Dynamic Observatory) spectrometer system will be mainly devoted for the study of cosmic muon induced nuclear reactions. The system will be developed around the 100% nominal efficiency ultra low-background HPGe spectrometer. Our previous detection system enabled only the detection of secondary muon induced events mostly from the interaction of cosmic muons with the shielding materials [1, 2]. The improved geometry of the MIREDO scintillation detection system will enable the direct measurement of the cross section of the muon induced reactions with the sample material.

AIP Conference Proceedings, 2006

ABSTRACT The 46.5 keV Γ-intensity of 210Pb in the background can be easily reduced by inner linin... more ABSTRACT The 46.5 keV Γ-intensity of 210Pb in the background can be easily reduced by inner lining, but the bremsstrahlung from the 1.2 MeV maximal energy β-decay will reach the lead shielded Ge detector. The spectrum of this bremsstrahlung is calculated by numerically fitting the β-spectrum and integrating the Koch-Motz formula. The adsorption of the bremsstrahlung spectrum in the lead is calculated by the effective solid angle algorithm by comparison with the measured background spectrum. It is shown, that for the lead with 25 Bq/kg of 210Pb, at 100 keV the bremsstrahlung contribution to the background is about 20%.

应用数学和力学 英文版, 2011

The paper discusses the equilibrium instability problem of the scleronomic nonholonomic systems a... more The paper discusses the equilibrium instability problem of the scleronomic nonholonomic systems acted upon by dissipative, conservative, and circulatory forces. The method is based on the existence of solutions to the differential equations of the motion which asymptotically tends to the equilibrium state of the system as t tends to negative infinity. It is assumed that the kinetic energy, the

Acta Geographica Slovenica, Dec 15, 2013

Natural disasters and their effects have evolved to reflect the complexities of the physical and ... more Natural disasters and their effects have evolved to reflect the complexities of the physical and human environments, and their interactions in the modern world. After the earthquake and the tsunami of the Fukushima Daiichi nuclear reactors in March 2011 activists, lobbyist and reporters were quick to expose nuclear technology and demand if not an immediate closure, than at least a gradual phasing out of nuclear power plants. Further research on topics such as the safety of nuclear power plants, the environmental and social effects of radioactive contamination, and the potential of nuclear energy as a world power source has a critical role in this ongoing debate in order to reduce consumption of fossil fuels, and continuing rise in national energy demands for providing powerful motivators in the search for alternative energy sources.

AIP Conference Proceedings, 2007

ABSTRACT Contemporary theories of dark matter predict that weakly interacting massive particles i... more ABSTRACT Contemporary theories of dark matter predict that weakly interacting massive particles interact with matter by nuclear recoils leaving in the detector energies up 50 keV. The bremsstrahlung of 210Pb contributes to this spectral region. The 46.5 keV gamma intensity of 210Pb in the background can be easily reduced by inner lining, but the bremsstrahlung from the 1.2 MeV maximal energy beta decay will reach the lead shielded Ge detector. The spectrum of this bremsstrahlung is calculated by numerically fitting the beta spectrum and integrating the Koch-Motz formula. The absorption of the bremsstrahlung spectrum in the lead and detection efficiencies for Ge detector are calculated by the effective solid angle algorithm, using correction for photopeak/compton ratio of cross sections in Ge. By comparison with the measured spectrum, it is shown, that for the lead with 25 Bq/kg of 210Pb, up to 500 keV, the bremsstrahlung contribution to the background is about 20%. The calculated bremsstrahlung intensity is in good agreement with the experimental result derived in Max Planck Institute, Heidelberg..

Physical Review Letters, 2000

The first fully on-line use of the angular distribution of beta emission in detection of NMR of n... more The first fully on-line use of the angular distribution of beta emission in detection of NMR of nuclei oriented at low temperatures is reported. The magnetic moments of the single valence particle, intermediate mass, isotopes 67 Ni͑np 21 1͞2 ; 1͞2 2 ͒ and 69 Cu͑pp 1 3͞2 ; 3͞2 2 ͒ are measured to be 10.601͑5͒ m N and 12.84͑1͒ m N , respectively, revealing only a small deviation from the neutron p 1͞2 single-particle value in the former and a large deviation from the proton p 3͞2 single-particle value in the latter. Quantitative interpretation is given in terms of core polarization and meson-exchange currents.

AIP Conference Proceedings, 2009

ABSTRACT Cosmic-rays induced neutrons can produce measurable activity in carefully selected mater... more ABSTRACT Cosmic-rays induced neutrons can produce measurable activity in carefully selected materials used for construction of low-background gamma spectroscopy systems. In order to improve shielding of low-background systems, flux of neutrons inside the shield and level of induced activity should be measured.

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2007

Radon is a naturally occurring radioactive gas. Radon is the alpha emitter and decays to short-li... more Radon is a naturally occurring radioactive gas. Radon is the alpha emitter and decays to short-lived daughters (Po, Pb, Bi and Po). Radon partially decays in material where it has been generated and partially moves rapidly by concentration-driven diffusion into the open air. The presence of determined radon activity concentration in the atmosphere is the natural contamination. Sources of radon in flats are: soil under and round the object, building’s material and water and gas used in household. Radon is entering the home by emanation from walls, floor and ceiling, through underlying soil and from things and materials that are in the room. Underlying soil is the main source of indoor radon. However, building’s materials also may contribute to elevated indoor radon concentration, especially in combination with low ventilation. In this paper the results of the first radon mapping in Vojvodina are presented Indoor radon activity concentration in air has been measured at the whole area ...

cdsweb.cern.ch

It is proposed to measure the magnetic moment of 49 Sc by the Nuclear Magnetic Resonance on Orien... more It is proposed to measure the magnetic moment of 49 Sc by the Nuclear Magnetic Resonance on Oriented Nuclei (NMR-ON) method using the NICOLE on-line nuclear orientation facility. 49 Sc is the neutron rich, doubly closed-shell, nucleus 48 Ca plus one proton. Results will be used to deduce the effective g-factors in the 48 Ca region with reference to nuclear structure and meson exchange current effects.

Der Donauraum, 2012

„Die EU-Strategie für den Donauraum (EUSDR) ist eine makroregionale Strategie, die im Dezember 20... more „Die EU-Strategie für den Donauraum (EUSDR) ist eine makroregionale Strategie, die im Dezember 2010 von der Europäischen Kommission verabschiedet und 2011 vom Europäischen Rat gebilligt wurde. Die Strategie wurde von der Kommission gemeinsam mit den Staaten und relevanten Akteuren der Donauregion entwickelt, um verbreitet auftretende Herausforderungen gemeinsam zu bewältigen. Die Strategie soll für die im gesamten Donauraum bereits existierenden Maßnahmen und Initiativen Synergien schaff en und Kooperationen bewirken. Bei der Strategie geht es nicht um Finanzierung, sondern um engere Zusammenarbeit!“1

concentration measurements of: radon emanated from the soil, radionuclides 226 Ra, 232 Th and 40 ... more concentration measurements of: radon emanated from the soil, radionuclides 226 Ra, 232 Th and 40 K in the soil, indoor radon in the city of Novi Sad (the capital city of Vojvodina) using charcoal canisters and indoor radon in the Vojvodina region using alpha-track detectors and the radioactivityof some building materials. Influences of floor level, space under the rooms, boarding, and the heating system on indoor radon accumulation in the Vojvodina province, situated in the northern part of Serbia, are also presented in this paper. The total effective dose and the activity concentration index are calculated applying the dose criteria recommended by the European Union for building materials.

Journal of Radioanalytical and Nuclear Chemistry, 2014

The contents of natural radionuclides (226Ra, 232Th and 40K) in 33 fertilizers and 50 soil sample... more The contents of natural radionuclides (226Ra, 232Th and 40K) in 33 fertilizers and 50 soil samples from Vojvodina region, Serbia, were measured by low level gamma spectrometry. The obtained results showed that the averages of radiation hazard parameters for the fertilizers are higher than acceptable level for radium equivalent activity (Raeq), representative level index (Iγ), external hazard index (Hex) and absorbed dose rate (D) [1]. Based on the measured values of the activity concentration of radionuclides in soils, the activity concentrations of radionuclides for most commonly grown crops in Vojvodina were calculated.

AIP Conference Proceedings

The features of the ground located gamma ray spectrometer shielded passively with 12 cm of lead a... more The features of the ground located gamma ray spectrometer shielded passively with 12 cm of lead and actively by five 0.5 m× 0.5 m× 0.05 m plastic veto shields are described. The detector mass related background was 0.345 C/kg s. The 511 keV annihilation line was ...

AIP Conference Proceedings, 2007

ABSTRACT Nineteen years after Chernobyl nuclear accident, activity concentration of 137Cs still c... more ABSTRACT Nineteen years after Chernobyl nuclear accident, activity concentration of 137Cs still could be detected in food and soil samples in Central and Eastern Europe. In this paper radiation levels of radium and cesium in Lucerne will be presented. It is a perennial plant with a deep root system and it is widely grown throughout the world as forage for cattle. The samples of Lucerne were taken from twelve different locations in Vojvodina in the summer period July-September 2004. The samples were specially dried on the air and after that ground, powdered and mineralized by method of dry burning on the temperature of 450°C. Gamma spectrometry measurements of the ash were performed by means of actively shielded germanium detector with maximal background reduction. For cesium 137Cs 10 mBq/kg order of magnitude detection limits were achieved.

AIP Conference Proceedings, 2007

ABSTRACT Overview of new educational program and training in Medical Physics at the University of... more ABSTRACT Overview of new educational program and training in Medical Physics at the University of Novi Sad is presented, where the medical physics education from undergraduate to doctoral study is established in the last decade. Necessity for basic and additional education and hospital training for medical physicists becomes the evident subject in clinical practice in which physicists and physicians are in close collaboration to ensure high quality of patient care. Learning objectives: to incorporate the latest scientific and professional findings in the field of medical physics, medical diagnostics, therapy and instruments; to accomodate students' pursuits of individual fields by offering elective courses from different areas of current medical practice; to reflect the multidisciplinary spirit of the studies, since teaching is performed by experts from diverse fields.

AIP Conference Proceedings, 2009

The MIREDO (Muon Induced Rare Event Dynamic Observatory) spectrometer system will be mainly devot... more The MIREDO (Muon Induced Rare Event Dynamic Observatory) spectrometer system will be mainly devoted for the study of cosmic muon induced nuclear reactions. The system will be developed around the 100% nominal efficiency ultra low-background HPGe spectrometer. Our previous detection system enabled only the detection of secondary muon induced events mostly from the interaction of cosmic muons with the shielding materials [1, 2]. The improved geometry of the MIREDO scintillation detection system will enable the direct measurement of the cross section of the muon induced reactions with the sample material.

AIP Conference Proceedings, 2006

ABSTRACT The 46.5 keV Γ-intensity of 210Pb in the background can be easily reduced by inner linin... more ABSTRACT The 46.5 keV Γ-intensity of 210Pb in the background can be easily reduced by inner lining, but the bremsstrahlung from the 1.2 MeV maximal energy β-decay will reach the lead shielded Ge detector. The spectrum of this bremsstrahlung is calculated by numerically fitting the β-spectrum and integrating the Koch-Motz formula. The adsorption of the bremsstrahlung spectrum in the lead is calculated by the effective solid angle algorithm by comparison with the measured background spectrum. It is shown, that for the lead with 25 Bq/kg of 210Pb, at 100 keV the bremsstrahlung contribution to the background is about 20%.

应用数学和力学 英文版, 2011

The paper discusses the equilibrium instability problem of the scleronomic nonholonomic systems a... more The paper discusses the equilibrium instability problem of the scleronomic nonholonomic systems acted upon by dissipative, conservative, and circulatory forces. The method is based on the existence of solutions to the differential equations of the motion which asymptotically tends to the equilibrium state of the system as t tends to negative infinity. It is assumed that the kinetic energy, the

Acta Geographica Slovenica, Dec 15, 2013

Natural disasters and their effects have evolved to reflect the complexities of the physical and ... more Natural disasters and their effects have evolved to reflect the complexities of the physical and human environments, and their interactions in the modern world. After the earthquake and the tsunami of the Fukushima Daiichi nuclear reactors in March 2011 activists, lobbyist and reporters were quick to expose nuclear technology and demand if not an immediate closure, than at least a gradual phasing out of nuclear power plants. Further research on topics such as the safety of nuclear power plants, the environmental and social effects of radioactive contamination, and the potential of nuclear energy as a world power source has a critical role in this ongoing debate in order to reduce consumption of fossil fuels, and continuing rise in national energy demands for providing powerful motivators in the search for alternative energy sources.