Social Organization for Radioecological Cleanliness

Veszprém, Hungary

Social Organization for Radioecological Cleanliness

Veszprém, Hungary
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Vaupotic J.,Jozef Stefan Institute | Bezek M.,Jozef Stefan Institute | Kavasi N.,Social Organization for Radioecological Cleanliness | Kavasi N.,Japan National Institute of Radiological Sciences | And 3 more authors.
Radiation Protection Dosimetry | Year: 2012

Exposing the Raduet Rn-Tn solid-state nuclear track detectors, radon (Rn: 222Rn) and thoron (Tn: 220Rn) activity concentrations have been measured in 7 kindergartens and 18 elementary schools in Slovenia. Diurnal variations of both gases were monitored using a Rad7 device. The Rn concentration was in the range from 145 to 794 Bq m-3 in kindergartens and from 70 to 770 Bq m-3 in schools, and the Tn concentration was in the range from 21 to 73 Bq m-3 in kindergartens and from 4 to 91 Bq m-3 in schools. The Tn versus Rn concentration ratio varied from 0.02 to 0.83. Monthly effective doses due to radon and its decay products ranged from 109 to 600 μSv month-1 in kindergartens and from 21 to 232 μSv month-1 in schools, and those due to thoron and its decay products ranged from 3.8 to 13.3 μSv month-1 in kindergartens and from 0.29 to 6.62 μSv month-1 in schools. The contribution of thoron to the total effective dose was from 1.3 to 11 % in kindergartens and from 0.4 to 17 % in schools. © The Author 2012. Published by Oxford University Press. All rights reserved.


Bezek M.,Jozef Stefan Institute | Gregoric A.,Jozef Stefan Institute | Kavasi N.,Social Organization for Radioecological Cleanliness | Kavasi N.,Japan National Institute of Radiological Sciences | Vaupotic J.,Jozef Stefan Institute
Radiation Protection Dosimetry | Year: 2012

At the lowest point along the tourist route in the Postojna Cave, the activity concentration of radon (222Rn) short-lived decay products and number concentration and size distribution of background aerosol particles in the size range of 10-1100 nm were measured. In the warm yearly season, aerosol concentration was low (52 cm-3) with 21 % particles smaller than 50 nm, while in the cold season, it was higher (1238 cm-3) with 8 % of <50 nmparticles. Radon activity concentrations were 4489 and 1108 Bq m-3, and fractions of unattached radon decay products were 0.62 and 0.13, respectively. © The Author 2012. Published by Oxford University Press. All rights reserved.


Jobbagy V.,Social Organization for Radioecological Cleanliness | Kavasi N.,Social Organization for Radioecological Cleanliness | Kavasi N.,Japan National Institute of Radiological Sciences | Somlai J.,University of Pannonia | And 3 more authors.
Journal of Radioanalytical and Nuclear Chemistry | Year: 2010

Within this work, the activity concentrations of uranium isotopes ( 234U, 235U, and 238U) were analyzed in some of the popular and regularly consumed Hungarian mineral-, spring-, therapeutic waters and tap waters. Samples were selected randomly and were taken from different regions of Hungary (Balaton Upland, Bükk Mountain, Somogy Hills, Mezoföld, and Lake Hévíz). Concentration (mBq L-1) of 234U, 235U, and 238U in the waters varied from 1.1 to 685.2, from <0.3 to 7.9, and from 0.8 to 231.6 respectively. In general, the highest uranium concentrations were measured in spring waters, while the lowest were found in tap waters. In most cases radioactive disequilibrium was observed between uranium isotopes (234U and 238U). The activity ratio between 234U and 238U varies from 0.57 to 4.97. The calculated doses for the analyzed samples of spring water are in the range 0.07-32.39 μSv year-1 with an average 4.32 μSv year-1. This is well below the 100 μSv year-1 reference level of the committed effective dose recommended by WHO and the EU Council. The other naturally occurring alpha emitting radionuclides (226Ra and 210Po) will be analyzed later to complete the dose assessment. This study provides preliminary information for consumers and authorities about their internal radiological exposure risk due to annual intake of uranium isotopes via water consumption. © 2010 Akadémiai Kiadó, Budapest, Hungary.


Kovacs T.,University of Pannonia | Sas Z.,University of Pannonia | Somlai J.,University of Pannonia | Jobbagy V.,Social Organization for Radioecological Cleanliness | Szeiler G.,University of Pannonia
Radiation Protection Dosimetry | Year: 2012

On 4 October 2010, the gate of a red mud waste dump of a Hungarian alumina factory was damaged and ~800.000 m3 of alkaline red mud flooded the vicinity of the dumps. Red mud samples were collected from the contaminated area and they were investigated from the radiological point of view. The activity concentrations were as follows: 232Th: 264 (194-337) Bq kg-1, 238U: 265 (197-332) Bq kg-1, 226Ra: 180 (143-237) Bq kg-1, 40K: 283 (228-360) Bq kg-1. As a function of the moisture content (0-28 %), the obtained radon emanation coefficients were relatively high (7.6-20 %) and, consequently, the radon exhalation also increased. © The Author 2012. Published by Oxford University Press. All rights reserved.


Szeiler G.,University of Pannonia | Somlai J.,University of Pannonia | Ishikawa T.,Japan National Institute of Radiological Sciences | Omori Y.,Japan National Institute of Radiological Sciences | And 6 more authors.
Radiation Protection Dosimetry | Year: 2012

More than half of the radiation dose of natural origin comes from radon. However, according to some surveys in certain cases, the radiation dose originating from thoron may be considerable. Among the factors disturbing the measurement of radon, the presence of thoron may also influence the measured radon value, making the estimated radiation exposure imprecise. Thoron has previously been surveyed, mainly in Asia; however, recent surveys for some European locations have found that significant thoron concentrations also need to be considered. In this survey, several types of commercially available SSNTDs (solid-state nuclear track detectors) capable of measuring both radon and thoron were placed at the same time in 73 houses and 7 workplaces in Hungary with 3-month exposition periods. In order to measure thoron, the distance of the detector sets was fixed as 15-20 cm from the walls. The radon concentration was measured with five types of SSNTDs: NRPB, NRPB SSI, Raduet, DTPS and DRPS. The first four types had relatively good accordance (within ± 10 %), but the results of the DRPS detectors were considerably lower when compared with other detectors for radon concentrations over 100 Bq m-3. The thoron averages were provided by two different types of detectors: Raduet and DTPS. The difference between their average results was more than 30 % and was six times the maximum values. Therefore, the thoron measurement results were judged to be erroneous, and their measurement protocol should be clearly established for future work. © The Author 2012. Published by Oxford University Press. All rights reserved.


Kavasi N.,Japan National Institute of Radiological Sciences | Vigh T.,Social Organization for Radioecological Cleanliness | Vigh T.,Manganese Mining Process Ltd. | Nemeth C.,Social Organization for Radioecological Cleanliness | And 5 more authors.
Review of Scientific Instruments | Year: 2014

During a one-year long measurement period, radon and thoron data obtained by two different passive radon-thoron discriminative monitors were compared at subsurface workplaces in Hungary, such as mines (bauxite and manganese ore) and caves (medical and touristic). These workplaces have special environmental conditions, such as, stable and high relative humidity (100%), relatively stable temperature (12 C-21 C), low or high wind speed (max. 2.4 m s-1) and low or elevated aerosol concentration (130-60 000 particles m-3). The measured radon and thoron concentrations fluctuated in a wide range among the different workplaces. The respective annual average radon concentrations and their standard deviations (in brackets) measured by the passive radon-thoron discriminative monitor with cellulose filter (CF) and the passive radon-thoron discriminative monitor with sponge filter (SF) were: 350(321) Bq m-3 and 550(497) Bq m-3 in the bauxite mine; 887(604) Bq m-3 and 1258(788) Bq m-3 in the manganese ore mine; 2510(2341) Bq m -3 and 3403(3075) Bq m-3 in the medical cave (Hospital Cave of Tapolca); and 6239(2057) Bq m-3 and 8512(1955) Bq m -3 in the touristic cave (Lake Cave of Tapolca). The respective average thoron concentrations and their standard deviation (in brackets) measured by CF and SF monitors were: 154(210) Bq m-3 and 161(148) Bq m-3 in the bauxite mine; 187(191) Bq m-3 and 117(147) Bq m-3 in the manganese-ore mine; 360(524) Bq m-3 and 371(789) Bq m-3 in the medical cave (Hospital Cave of Tapolca); and 1420(1184) Bq m-3 and 1462(3655) Bq m-3 in the touristic cave (Lake Cave of Tapolca). Under these circumstances, comparison of the radon data for the SF and CF monitors showed the former were consistently 51% higher in the bauxite mine, 38% higher in the manganese ore mine, and 34% higher in the caves. Consequently, correction is required on previously obtained radon data acquired by CF monitors at subsurface workplaces to gain comparable data for SF monitors. In the case of thoron, the data were unreliable and no significant tendency was seen during the comparison therefore comparison of previously obtained thoron data acquired by either CF or SF is doubtful. There was probable influence by relative humidity on the detection response; however, the effects of the high wind speed and elevated aerosol concentration could not be excluded. The results of this study call attention to the importance of calibration under extreme environmental conditions and the need for using reliable radon-thoron monitors for subsurface workplaces. © 2014 AIP Publishing LLC.


Jobbagy V.,Social Organization for Radioecological Cleanliness | Kavasi N.,Social Organization for Radioecological Cleanliness | Somlai J.,University of Pannonia | Mate B.,University of Pannonia | Kovacs T.,University of Pannonia
Microchemical Journal | Year: 2010

Hungary is rich in spring waters. A survey studying the naturally occurring alpha emitter radionuclides in 30 frequently visited and regularly consumed spring waters was conducted out in the Balaton Upland region of Hungary. 226Ra, 224Ra, 234U, 238U and 210Po activity concentrations were determined by using alpha spectrometry after separation from matrix elements. Average concentration (mBq L- 1) of 226Ra, 224Ra, 234U, 238U and 210Po in the spring waters is varied from 2.1 to 601, from < 1.1 to 65.4, from 3.9 to 741.9, from < 0.44 to 274.3 and from 2 to 15.2 respectively. In most cases radioactive disequilibrium was observed between uranium and radium isotopes. The doses for the analyzed samples of spring water are in the range 3.59-166.73 μSv y- 1 with an average 18.2 μSv y- 1 .This is well below the 100 μSv y- 1 reference level of the committed effective dose recommended by WHO. Only one water sample had a dose higher than 100 μSv y- 1, mainly due to the contribution from radium (226Ra, 224Ra) and 210Po isotopes. This study provides important information for consumers and authorities about their internal radiological exposure risk from spring water intake. © 2009 Elsevier B.V. All rights reserved.


Jobbagy V.,Social Organization for Radioecological Cleanliness | Kavasi N.,Social Organization for Radioecological Cleanliness | Somlai J.,University of Pannonia | Dombovari P.,Paks Nuclear Power Plant | And 2 more authors.
Radiation Measurements | Year: 2011

Hungary is rich in underground waters such as thermal, mineral, and spring waters. A survey was carried out to study the naturally occurring alpha emitter radionuclides in popular and regularly consumed spring waters in the Balaton Upland region of Hungary and significant levels of radioactivity were found. Thirty samples were analyzed for gross alpha and beta activity concentrations by the low background gas flow proportional counter. The activity concentrations ranging from 26 to 1749 mBq dm-3 and from 33 to 2015 mBq dm -3 for gross alpha and beta, respectively, were observed in the spring waters. In general, the gross beta activity was higher than the alpha activity concentration. According to the results obtained, elevated level of Total Indicative Dose (TID) might be expected due to spring water consumption. In some cases, total dose might exceed the 100 μSv y-1 reference level recommended by WHO. The data obtained can provide an important information for the consumers and the authorities regarding the preliminary dose exposure risk due to spring water intake. © 2010 Elsevier Ltd. All rights reserved.


Csordas A.,University of Pannonia | Bator G.,Social Organization for Radioecological Cleanliness | Horvath D.,University of Pannonia | Somlai J.,University of Pannonia | Kovacs T.,University of Pannonia
Radiation Measurements | Year: 2016

Given that more than half of the radiation affecting humans is provided by radon and its progenies, surveying them has received a significant level of attention. Solid-state nuclear track detectors are most suited to carry out such surveys, e.g., CR-39-based detectors. Ordinarily, track detectors employ optical microscopes; however, in this study, a new scanner-based calibration and validation system is introduced. After exposure, the detectors were etched in a 6.25 M NaOH solution at 90 °C for 4.5 h; the diameters of the tracks developed in this way were typically 40-60 microns. Tracks were assessed using a Canon Canoscan 9000F scanner with a resolution of 4800 dpi, and Image Analyser software developed by ourselves. For the system calibration, known diameter tracks were prepared using an ArF excimer laser (λ = 193 nm), such that both the shape coefficient and the size of the tracks could be changed within the range of 10-100 μm. The operation of the scanner and the evaluation-shape recognition software were examined using repeatability and reproducibility tests. The system was capable of evaluating 100 detectors in an hour. The repeatability and reproducibility value of the system was excellent, with evaluation of the same detector on several occasions at different times producing a spread of 2%. The maximum spread for scanning in different positions was 3%. © 2016 Elsevier Ltd. All rights reserved.


Kovacs T.,University of Pannonia | Sas Z.,University of Pannonia | Jobbagy V.,Social Organization for Radioecological Cleanliness | Csordas A.,Social Organization for Radioecological Cleanliness | And 2 more authors.
Acta Geophysica | Year: 2013

One of the most severe industrial catastrophes happened in Kolontár, Hungary, on 4 October 2010. Red mud (bauxite residue) broke through the eroded wall of the red mud reservoir pond "Number X" and flooded the surrounding area. This led to the instant death of 10 people and the injury of more than 100 people. Red mud is enriched in radium and thorium isotopes; therefore, there is a chance that this flooding will increase radionuclide concentrations of soils and also in air. In this study we have examined the site to assess the realistic radiological risks. For the risk assessment the following parameters were determined: gamma dose rate, radon concentration, radionuclide concentration of red mud and air dust concentration. It was found that the radiation dose exposure resulting from red mud contamination was < 0.045 mSv y-1 (excluding radon), which can be considered negligible when compared to the average annual effective dose from natural sources (2.4 mSv y-1). © 2013 Versita Warsaw and Springer-Verlag Wien.

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