Radioecological assessment and remediation planning at the former uranium milling facilities at the Pridnieprovsky Chemical Plant in Ukraine

Lavrova, Tetyana; Voitsekhovych, Oleg

doi:10.1016/j.jenvrad.2012.06.011

Cited by 12 publications

(9 citation statements)

References 3 publications

(4 reference statements)

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“…CO 2 fluxes measured on the ground reached maxima of 19,000 g m −2 d −1 [ Perrier et al , ], a value typically associated with volcanoes [e.g., Granieri et al , ; Carapezza et al , ], while the total CO 2 discharge rate near the main hot springs was estimated to be only 1.0 ± 0.3 t d −1 [ Perrier et al , ]. Radon fluxes measured on the ground reached maxima of 2.0 Bq m −2 s −1 [ Perrier et al , ], an uncommonly large value more typically associated with former uranium mining/milling sites [e.g., Mudd , ; Lavrova and Voitsekhovych , ]. While radon might be a unique asset for temporal monitoring, previous studies have been unsuccessful in establishing a consistent relationship between radon and CO 2 .…”

Section: Introductionmentioning

confidence: 99%

The Syabru‐Bensi hydrothermal system in central Nepal: 1. Characterization of carbon dioxide and radon fluxes

et al. 2014

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The Syabru-Bensi hydrothermal system (SBHS), located at the Main Central Thrust zone in central Nepal, is characterized by hot (30-62°C) water springs and cold (<35°C) carbon dioxide (CO 2 ) degassing areas. From 2007 to 2011, five gas zones (GZ1-GZ5) were studied, with more than 1600 CO 2 and 850 radon flux measurements, with complementary self-potential data, thermal infrared imaging, and effective radium concentration of soils. Measurement uncertainties were evaluated in the field. CO 2 and radon fluxes vary over 5 to 6 orders of magnitude, reaching exceptional maximum values of 236 ± 50 kg m À2 d À1 and 38.5 ± 8.0 Bq m À2 s À1 , with estimated integrated discharges over all gas zones of 5.9 ± 1.6 t d À1 and 140 ± 30 MBq d À1 , respectively. Soil-gas radon concentration is 40 × 10 3 Bq m À3 in GZ1-GZ2 and 70 × 10 3 Bq m À3 in GZ3-GZ4. Strong relationships between CO 2 and radon fluxes in all gas zones (correlation coefficient R = 0.86 ± 0.02) indicate related gas transport mechanisms and demonstrate that radon can be considered as a relevant proxy for CO 2 . CO 2 carbon isotopic ratios (δ 13 C from À1.7 ± 0.1 to À0.5 ± 0.1‰), with the absence of mantle signature (helium isotopic ratios R/R A < 0.05), suggest metamorphic decarbonation at depth. Thus, the SBHS emerges as a unique geosystem with significant deep origin CO 2 discharge located in a seismically active region, where we can test methodological issues and our understanding of transport properties and fluid circulations in the subsurface.

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Section: Introductionmentioning

confidence: 99%

The Syabru‐Bensi hydrothermal system in central Nepal: 1. Characterization of carbon dioxide and radon fluxes

et al. 2014

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“…The high est mean 226 Ra ac tiv ity con cen tra tions for the tail ings ponds were around 1300 Bqkg -1 . En vi ron men tal prob lems in con nec tion with remediation pro vi sions in the sur round ings of the for mer ura nium plant in Pridnieprov in Ukraine were stud ied by Lavrov and Voitsekhovych [41], who men tioned 226 Ra and 238 U ac tiv ity con cen tra tions of hun dreds to thousands of Bqkg -1 . Some val ues mea sured in these ar eas are given in tab.…”

Section: Measurement Of Activity Concentrations In Soil Samplesmentioning

confidence: 99%

Assessment of the radiological situation in different areas affected by uranium mining and uranium processing in the Czech Republic

et al. 2021

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This study presents measurements of activity concentrations of natural radionuclides in selected water and soil samples taken from areas affected by the uranium industry in the surroundings of Pribram, Straz pod Ralskem and Mydlovary, Czech Republic. In these areas, the dose equivalent rate was also determined at the sampling locations and additionally also during walkabouts in the surroundings of sludge fields. The activity concentration of water samples was 0.06 ? 0.02 BqL?1 for 226Ra and 0.07 ? 0.07 mgL?1 for 238U while the mean activity concentrations of soil samples were 74 ? 70 Bqkg?1 and 80 ? 77 Bqkg?1 for 226Ra and 238U, respectively. The average value of the dose equivalent rate was of 0.15 ? 0.1 ?Svh?1. These values conform with the nature of the industrial activities which were carried out in the areas and are comparable with measurement results in similar locations worldwide.

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“…The upper cover of the CY tailings was installed aiming to physically protect the tailings material from atmospheric precipitations, to mitigate exhalation of 222 Rn and dispersion of the contaminated materials from the tailings surface, but in fact, it cannot efficiently prevent water infiltration within the tailings body. Previous studies of Lavrova and Voitsekhovych [1] showed that poor quality and condition of the upper cover of the CY tailings cannot prevent excessive exhalation of 222 Rn from the tailings body. The lack of the cover stability, percolated by the roots of deciduous trees planted here, provokes infiltration of atmospheric precipitation in the tailings body, which triggers acute downward migration of radionuclides.…”

Section: Introductionmentioning

confidence: 97%

“…Next drilling companies carried out during 2009 and 2012. The results of studies of this material reported in [1,3,4] allowed to preliminary estimate the vertical profiles of radionuclide distribution in the tailings bodies and consequently to present more accurate radionuclide inventory assessment for the tailings. Physical and chemical speciation of the radionuclides of U/Th series in the tailings materials from this site have also been studied by Protsak and Kashparov [5] and by Marynych et al [6,7].…”

Section: Introductionmentioning

confidence: 99%

Speciation and mobility of uranium in tailings materials at the U-production legacy site in Ukraine

Korychenskyi¹,

Laptev²,

Voitsekhovych³

et al. 2018

Nucl. Phys. At. Energy

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The results of the study on speciation and mobility of uranium in the ore processing residues in the Centralny Yar tailings (CY, former uranium processing site -Pridneprovsky Chemical Plant in Ukraine) are presented. Due to poor neutralization sludge material was dumped into the tailings body in acidic state. Several incidents with breakage in the pipeline transporting complex radiochemical solutions caused radioactive material spillover onto the tailings surface. Two features of radiological concern were identifiedsecondary contamination of the tailings surface amid elevated gamma dose rates, and excessive migration of radionuclides of U/Th decay series in strong acidic conditions within the tailings body. The monitoring data collected during 2005-2017 showed fast migration of uranium from the tailings body into the groundwater with specific activity varied in the range from 1 to 20 Bq/L. To support this finding the experimental studies aimed to obtain physical and chemical speciation of uranium in the tailings materials in existing and simulated conditions were undertaken. This was conducted by application of modified BCR sequential extraction methods followed by assessment of uranium speciation in equilibrium conditions, using the geochemical modeling tool MEDUSA coupled with the HYDRA database.

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Radioecological assessment and remediation planning at the former uranium milling facilities at the Pridnieprovsky Chemical Plant in Ukraine

Cited by 12 publications

References 3 publications

The Syabru‐Bensi hydrothermal system in central Nepal: 1. Characterization of carbon dioxide and radon fluxes

The Syabru‐Bensi hydrothermal system in central Nepal: 1. Characterization of carbon dioxide and radon fluxes

Assessment of the radiological situation in different areas affected by uranium mining and uranium processing in the Czech Republic

Speciation and mobility of uranium in tailings materials at the U-production legacy site in Ukraine

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