TY  - JOUR
AU  - Rubinjoni, Luka
AU  - Stanković, Srboljub J.
AU  - Lončar, Boris
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4432
AB  - Cementation is the baseline technology for conditioning of low to intermediate level radioactive waste. Geopolymers, a class of alkali activated binders, are a promising new material for radioactive waste treatment. Coal fly-ash based geopolymers are a low-cost, low greenhouse gas footprint alternative to metakaolin based materials. Both the grouting of sludge/powders/liquids and encapsulation of solids/compacted waste rely on the grout maintaining optimal flow (theological properties) during the mixing and pouring operations, and achieving a set leading to proper long term solidification (mechanical properties). The initial and final setting time for fly-ash geopolymer paste, based on the SRPS EN 196-3 standard, has been measured upon irradiation by gamma rays in a Co-60 reference field positioned with a kerma air rate of 3.42 mGys(-1). The binder paste was prepared using fly-ash from the TENT B power plant's electrostatic filters without further sieving, activated by water glass with module 1.5 and mixed with distilled water until a satisfactory flow was obtained, and poured into the sample and control molds. The initial and final setting times for the irradiated sample and non-irradiated control were determined by the Vicat apparatus. The irradiated sample demonstrated an 11 % shorter initial setting time, and 16 % shorter final setting time, compared to the control.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Nuclear Technology & Radiation Protection
T1  - The effect of co-60 gamma irradiation on coal fly-ash geopolymer paste setting time
EP  - 153
IS  - 2
SP  - 150
VL  - 35
DO  - 10.2298/NTRP2002150R
ER  - 

@article{
author = "Rubinjoni, Luka and Stanković, Srboljub J. and Lončar, Boris",
year = "2020",
abstract = "Cementation is the baseline technology for conditioning of low to intermediate level radioactive waste. Geopolymers, a class of alkali activated binders, are a promising new material for radioactive waste treatment. Coal fly-ash based geopolymers are a low-cost, low greenhouse gas footprint alternative to metakaolin based materials. Both the grouting of sludge/powders/liquids and encapsulation of solids/compacted waste rely on the grout maintaining optimal flow (theological properties) during the mixing and pouring operations, and achieving a set leading to proper long term solidification (mechanical properties). The initial and final setting time for fly-ash geopolymer paste, based on the SRPS EN 196-3 standard, has been measured upon irradiation by gamma rays in a Co-60 reference field positioned with a kerma air rate of 3.42 mGys(-1). The binder paste was prepared using fly-ash from the TENT B power plant's electrostatic filters without further sieving, activated by water glass with module 1.5 and mixed with distilled water until a satisfactory flow was obtained, and poured into the sample and control molds. The initial and final setting times for the irradiated sample and non-irradiated control were determined by the Vicat apparatus. The irradiated sample demonstrated an 11 % shorter initial setting time, and 16 % shorter final setting time, compared to the control.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Nuclear Technology & Radiation Protection",
title = "The effect of co-60 gamma irradiation on coal fly-ash geopolymer paste setting time",
pages = "153-150",
number = "2",
volume = "35",
doi = "10.2298/NTRP2002150R"
}

Rubinjoni, L., Stanković, S. J.,& Lončar, B.. (2020). The effect of co-60 gamma irradiation on coal fly-ash geopolymer paste setting time. in Nuclear Technology & Radiation Protection
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 35(2), 150-153.
https://doi.org/10.2298/NTRP2002150R

Rubinjoni L, Stanković SJ, Lončar B. The effect of co-60 gamma irradiation on coal fly-ash geopolymer paste setting time. in Nuclear Technology & Radiation Protection. 2020;35(2):150-153.
doi:10.2298/NTRP2002150R .

Rubinjoni, Luka, Stanković, Srboljub J., Lončar, Boris, "The effect of co-60 gamma irradiation on coal fly-ash geopolymer paste setting time" in Nuclear Technology & Radiation Protection, 35, no. 2 (2020):150-153,
https://doi.org/10.2298/NTRP2002150R . .

TY  - CONF
AU  - Radenković, Mirjana
AU  - Milošević, Sanja
AU  - Stanković, Srboljub
AU  - Joksić, J.
AU  - Onjia, Antonije
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7099
AB  - Natural uranium, consisting of 238U, 234U and 235U isotopes is present in the environment in low
concentrations especially in the atmosphere where it usually exists as a constituent of particulate
matter submicron conglomerates suspended in the air. In the case of contamination, uranium may be
present in the aerosol, being transferred to other areas by wind and again settled on the surface soil
with possible migration into deeper layers or resuspension under certain meteorological conditions.
Here results on the airborne uranium assessment based on the analysis of lichen species already
present or transplanted into contaminated areas will be presented. With that aim, different in situ
and transplanted epiphytic lichen species have been taken at selected locations in southern Serbia in
the stage of existing contamination by depleted uranium, during the clean-up activities and
afterwards, in all four seasons. Collected samples underwent analysis by sensitive nuclear analytical
techniques. The INAA and ICP MS results are derived from 238U mass fraction while high resolution
alpha-spectrometry gave results for each isotope expressed as specific activity concentration
(Bq kg-1). Based on the isotopic ratios 235U /238U and 234U /238U, depleted uranium content was
possible to distinguish from natural uranium in the samples. Results have shown that the sensitivity
of the examined morphologically different lichen types and their ability to accumulate metals
including uranium, strongly depend on metals’ concentration in the air as well as on the age of
lichens, properties of host species, chemical properties of particles, local climate conditions, exposure
time etc. Epiphytic lichen species Evernia prunastri was found to be the most suitable bioindicator
for the accumulation of uranium airborne particles. Concerning the uranium content, a significant
difference in concentrations had been observed for different sampling phases, with maximum
depleted uranium contribution during the clean-up activities. The variability in uranium
concentrations was noticeable in relation to prevailing wind direction, position and distance of the
sampling points. Having in mind the results obtained within the national radioactivity monitoring
program 2011-2017, it may be concluded that for detailed airborne uranium assessment, a
methodology such as biomonitoring with the application of sensitive nuclear techniques should be
considered.
PB  - Niš : RAD Centre
C3  - Book of abstracts / Seventh International Conference on Radiation in Various Fields of Research, RAD 7, RAD 2019, 10-14.06.2019 Herceg Novi, Montenegro
T1  - Airborne uranium assessment by epiphytic lichen species in contaminated areas
SP  - 419
UR  - https://hdl.handle.net/21.15107/rcub_technorep_7099
ER  - 

@conference{
author = "Radenković, Mirjana and Milošević, Sanja and Stanković, Srboljub and Joksić, J. and Onjia, Antonije",
year = "2019",
abstract = "Natural uranium, consisting of 238U, 234U and 235U isotopes is present in the environment in low
concentrations especially in the atmosphere where it usually exists as a constituent of particulate
matter submicron conglomerates suspended in the air. In the case of contamination, uranium may be
present in the aerosol, being transferred to other areas by wind and again settled on the surface soil
with possible migration into deeper layers or resuspension under certain meteorological conditions.
Here results on the airborne uranium assessment based on the analysis of lichen species already
present or transplanted into contaminated areas will be presented. With that aim, different in situ
and transplanted epiphytic lichen species have been taken at selected locations in southern Serbia in
the stage of existing contamination by depleted uranium, during the clean-up activities and
afterwards, in all four seasons. Collected samples underwent analysis by sensitive nuclear analytical
techniques. The INAA and ICP MS results are derived from 238U mass fraction while high resolution
alpha-spectrometry gave results for each isotope expressed as specific activity concentration
(Bq kg-1). Based on the isotopic ratios 235U /238U and 234U /238U, depleted uranium content was
possible to distinguish from natural uranium in the samples. Results have shown that the sensitivity
of the examined morphologically different lichen types and their ability to accumulate metals
including uranium, strongly depend on metals’ concentration in the air as well as on the age of
lichens, properties of host species, chemical properties of particles, local climate conditions, exposure
time etc. Epiphytic lichen species Evernia prunastri was found to be the most suitable bioindicator
for the accumulation of uranium airborne particles. Concerning the uranium content, a significant
difference in concentrations had been observed for different sampling phases, with maximum
depleted uranium contribution during the clean-up activities. The variability in uranium
concentrations was noticeable in relation to prevailing wind direction, position and distance of the
sampling points. Having in mind the results obtained within the national radioactivity monitoring
program 2011-2017, it may be concluded that for detailed airborne uranium assessment, a
methodology such as biomonitoring with the application of sensitive nuclear techniques should be
considered.",
publisher = "Niš : RAD Centre",
journal = "Book of abstracts / Seventh International Conference on Radiation in Various Fields of Research, RAD 7, RAD 2019, 10-14.06.2019 Herceg Novi, Montenegro",
title = "Airborne uranium assessment by epiphytic lichen species in contaminated areas",
pages = "419",
url = "https://hdl.handle.net/21.15107/rcub_technorep_7099"
}

Radenković, M., Milošević, S., Stanković, S., Joksić, J.,& Onjia, A.. (2019). Airborne uranium assessment by epiphytic lichen species in contaminated areas. in Book of abstracts / Seventh International Conference on Radiation in Various Fields of Research, RAD 7, RAD 2019, 10-14.06.2019 Herceg Novi, Montenegro
Niš : RAD Centre., 419.
https://hdl.handle.net/21.15107/rcub_technorep_7099

Radenković M, Milošević S, Stanković S, Joksić J, Onjia A. Airborne uranium assessment by epiphytic lichen species in contaminated areas. in Book of abstracts / Seventh International Conference on Radiation in Various Fields of Research, RAD 7, RAD 2019, 10-14.06.2019 Herceg Novi, Montenegro. 2019;:419.
https://hdl.handle.net/21.15107/rcub_technorep_7099 .

Radenković, Mirjana, Milošević, Sanja, Stanković, Srboljub, Joksić, J., Onjia, Antonije, "Airborne uranium assessment by epiphytic lichen species in contaminated areas" in Book of abstracts / Seventh International Conference on Radiation in Various Fields of Research, RAD 7, RAD 2019, 10-14.06.2019 Herceg Novi, Montenegro (2019):419,
https://hdl.handle.net/21.15107/rcub_technorep_7099 .

TY  - JOUR
AU  - Lončar, Boris
AU  - Osmokrović, P.
AU  - Stanković, Srboljub J.
AU  - Šašić, Rajko
PY  - 2006
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/881
AB  - The aim of this paper is to find the possibility for improvement of gas-filled surge arresters (GFSA) characteristics in y and X radiation field by appropriate choice of electrode materials. For that purpose electrodes made of different materials were incorporated in the originally developed GFSA model. The obtained results show that both in y and X radiation fields, copper electrodes are an optimal solution, since they have the highest resistance to radiation effects. It is also shown GFSA are highly resistant to y radiation, but that X radiation leads to significant degradation of their characteristics.
PB  - Natl Inst Optoelectronics, Bucharest-Magurele
T2  - Journal of Optoelectronics and Advanced Materials
T1  - Influence of electrode material on gas-filled surge arresters characteristics in gamma and X radiation field
EP  - 866
IS  - 2
SP  - 863
VL  - 8
UR  - https://hdl.handle.net/21.15107/rcub_vinar_3010
ER  - 

@article{
author = "Lončar, Boris and Osmokrović, P. and Stanković, Srboljub J. and Šašić, Rajko",
year = "2006",
abstract = "The aim of this paper is to find the possibility for improvement of gas-filled surge arresters (GFSA) characteristics in y and X radiation field by appropriate choice of electrode materials. For that purpose electrodes made of different materials were incorporated in the originally developed GFSA model. The obtained results show that both in y and X radiation fields, copper electrodes are an optimal solution, since they have the highest resistance to radiation effects. It is also shown GFSA are highly resistant to y radiation, but that X radiation leads to significant degradation of their characteristics.",
publisher = "Natl Inst Optoelectronics, Bucharest-Magurele",
journal = "Journal of Optoelectronics and Advanced Materials",
title = "Influence of electrode material on gas-filled surge arresters characteristics in gamma and X radiation field",
pages = "866-863",
number = "2",
volume = "8",
url = "https://hdl.handle.net/21.15107/rcub_vinar_3010"
}

Lončar, B., Osmokrović, P., Stanković, S. J.,& Šašić, R.. (2006). Influence of electrode material on gas-filled surge arresters characteristics in gamma and X radiation field. in Journal of Optoelectronics and Advanced Materials
Natl Inst Optoelectronics, Bucharest-Magurele., 8(2), 863-866.
https://hdl.handle.net/21.15107/rcub_vinar_3010

Lončar B, Osmokrović P, Stanković SJ, Šašić R. Influence of electrode material on gas-filled surge arresters characteristics in gamma and X radiation field. in Journal of Optoelectronics and Advanced Materials. 2006;8(2):863-866.
https://hdl.handle.net/21.15107/rcub_vinar_3010 .

Lončar, Boris, Osmokrović, P., Stanković, Srboljub J., Šašić, Rajko, "Influence of electrode material on gas-filled surge arresters characteristics in gamma and X radiation field" in Journal of Optoelectronics and Advanced Materials, 8, no. 2 (2006):863-866,
https://hdl.handle.net/21.15107/rcub_vinar_3010 .

TY  - JOUR
AU  - Dragović, Snežana D.
AU  - Onjia, Antonije
AU  - Stanković, Srboljub J.
AU  - Aničin, Ivan V.
AU  - Bacić, G
PY  - 2005
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/814
AB  - An artificial neural network (ANN) model for the prediction of measuring uncertainties in gamma-ray spectrometry was developed and optimized. A three-layer feed-forward ANN with back-propagation learning algorithm was used to model uncertainties of measurement of activity levels of eight radionuclides (Ra-226, U-238, U-235, K-40, Th-232, Cs-134, Cs-137 and Be-7) in soil samples as a function of measurement time. It was shown that the neural network provides useful data even from small experimental databases. The performance of the optimized neural network was found to be very good, with correlation coefficients (R-2) between measured and predicted uncertainties ranging from 0.9050 to 0.9915. The correlation coefficients did not significantly deteriorate when the network was tested on samples with greatly different uranium-to-thorium (U-238/Th-232) ratios. The differences between measured and predicted uncertainties were not influenced by the absolute values of uncertainties of measured radionuclide activities. Once the ANN is trained, it could be employed in analyzing soil samples regardless of the U-238/Th-232 ratio. It was concluded that a considerable saving in time could be obtained using the trained neural network model for predicting the measurement times needed to attain the desired statistical accuracy.
PB  - Elsevier, Amsterdam
T2  - Nuclear Instruments & Methods in Physics Research Section A-Accelerators Spectrometers Detectors And
T1  - Artificial neural network modelling of uncertainty in gamma-ray spectrometry
EP  - 463
IS  - 2-3
SP  - 455
VL  - 540
DO  - 10.1016/j.nima.2004.11.045
ER  - 

@article{
author = "Dragović, Snežana D. and Onjia, Antonije and Stanković, Srboljub J. and Aničin, Ivan V. and Bacić, G",
year = "2005",
abstract = "An artificial neural network (ANN) model for the prediction of measuring uncertainties in gamma-ray spectrometry was developed and optimized. A three-layer feed-forward ANN with back-propagation learning algorithm was used to model uncertainties of measurement of activity levels of eight radionuclides (Ra-226, U-238, U-235, K-40, Th-232, Cs-134, Cs-137 and Be-7) in soil samples as a function of measurement time. It was shown that the neural network provides useful data even from small experimental databases. The performance of the optimized neural network was found to be very good, with correlation coefficients (R-2) between measured and predicted uncertainties ranging from 0.9050 to 0.9915. The correlation coefficients did not significantly deteriorate when the network was tested on samples with greatly different uranium-to-thorium (U-238/Th-232) ratios. The differences between measured and predicted uncertainties were not influenced by the absolute values of uncertainties of measured radionuclide activities. Once the ANN is trained, it could be employed in analyzing soil samples regardless of the U-238/Th-232 ratio. It was concluded that a considerable saving in time could be obtained using the trained neural network model for predicting the measurement times needed to attain the desired statistical accuracy.",
publisher = "Elsevier, Amsterdam",
journal = "Nuclear Instruments & Methods in Physics Research Section A-Accelerators Spectrometers Detectors And",
title = "Artificial neural network modelling of uncertainty in gamma-ray spectrometry",
pages = "463-455",
number = "2-3",
volume = "540",
doi = "10.1016/j.nima.2004.11.045"
}

Dragović, S. D., Onjia, A., Stanković, S. J., Aničin, I. V.,& Bacić, G.. (2005). Artificial neural network modelling of uncertainty in gamma-ray spectrometry. in Nuclear Instruments & Methods in Physics Research Section A-Accelerators Spectrometers Detectors And
Elsevier, Amsterdam., 540(2-3), 455-463.
https://doi.org/10.1016/j.nima.2004.11.045

Dragović SD, Onjia A, Stanković SJ, Aničin IV, Bacić G. Artificial neural network modelling of uncertainty in gamma-ray spectrometry. in Nuclear Instruments & Methods in Physics Research Section A-Accelerators Spectrometers Detectors And. 2005;540(2-3):455-463.
doi:10.1016/j.nima.2004.11.045 .

Dragović, Snežana D., Onjia, Antonije, Stanković, Srboljub J., Aničin, Ivan V., Bacić, G, "Artificial neural network modelling of uncertainty in gamma-ray spectrometry" in Nuclear Instruments & Methods in Physics Research Section A-Accelerators Spectrometers Detectors And, 540, no. 2-3 (2005):455-463,
https://doi.org/10.1016/j.nima.2004.11.045 . .

TY  - JOUR
AU  - Lončar, Boris B.
AU  - Osmokrovic, Predrag
AU  - Stojanovic, Markov
AU  - Stanković, Srboljub
PY  - 2001
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5364
AB  - In this study, we examine the reliability of erasable programmable read only memory (EPROM) and electrically erasable programmable read only memory (EEPROM) components under the influence of gamma radiation. This problem has significance in military industry and space technology Total dose results are presented for the JL 27C512D EPROM and 28C64C EEPROM components. There is evidence that EPROM components have better radioactive reliability than EEPROM components. Also, the changes to the EPROM are reversible, and after erasing and reprogramming all EPROM components are functional. On the other hand, changes to the EEPROM are irreversible, and under the influence of gamma radiation, all EEPROM components became permanently nonfunctional. The obtained results are analyzed and explained via the interaction of gamma radiation with oxide layers.
T2  - Japanese Journal of Applied Physics Part 1-Regular Papers Short Notes and Review Papers
T1  - Radioactive reliability of programmable memories
EP  - 1129
IS  - 2B
SP  - 1126
VL  - 40
DO  - 10.1143/JJAP.40.1126
ER  - 

@article{
author = "Lončar, Boris B. and Osmokrovic, Predrag and Stojanovic, Markov and Stanković, Srboljub",
year = "2001",
abstract = "In this study, we examine the reliability of erasable programmable read only memory (EPROM) and electrically erasable programmable read only memory (EEPROM) components under the influence of gamma radiation. This problem has significance in military industry and space technology Total dose results are presented for the JL 27C512D EPROM and 28C64C EEPROM components. There is evidence that EPROM components have better radioactive reliability than EEPROM components. Also, the changes to the EPROM are reversible, and after erasing and reprogramming all EPROM components are functional. On the other hand, changes to the EEPROM are irreversible, and under the influence of gamma radiation, all EEPROM components became permanently nonfunctional. The obtained results are analyzed and explained via the interaction of gamma radiation with oxide layers.",
journal = "Japanese Journal of Applied Physics Part 1-Regular Papers Short Notes and Review Papers",
title = "Radioactive reliability of programmable memories",
pages = "1129-1126",
number = "2B",
volume = "40",
doi = "10.1143/JJAP.40.1126"
}

Lončar, B. B., Osmokrovic, P., Stojanovic, M.,& Stanković, S.. (2001). Radioactive reliability of programmable memories. in Japanese Journal of Applied Physics Part 1-Regular Papers Short Notes and Review Papers, 40(2B), 1126-1129.
https://doi.org/10.1143/JJAP.40.1126

Lončar BB, Osmokrovic P, Stojanovic M, Stanković S. Radioactive reliability of programmable memories. in Japanese Journal of Applied Physics Part 1-Regular Papers Short Notes and Review Papers. 2001;40(2B):1126-1129.
doi:10.1143/JJAP.40.1126 .

Lončar, Boris B., Osmokrovic, Predrag, Stojanovic, Markov, Stanković, Srboljub, "Radioactive reliability of programmable memories" in Japanese Journal of Applied Physics Part 1-Regular Papers Short Notes and Review Papers, 40, no. 2B (2001):1126-1129,
https://doi.org/10.1143/JJAP.40.1126 . .