226Ra bioavailability to plants at the Urgeiriça uranium mill tailings site

Madruga, M.J.; Brogueira, A.; Alberto, G.; Cardoso, F

doi:10.1016/s0265-931x(00)00173-9

Cited by 40 publications

(22 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The observed uptake of 226 Ra in UMT-contaminated soil indicates that potential risk of internal radiation exposure to nearby living organisms should be considered in areas contaminated with UMT. Our particular study confirmed high 226 Ra transfer from soil to Chinese cabbage, as being reported for other plants growing near or on a uranium mill tailings wastes [13][14][15][16][17][18][19][20][21].…”

Section: Soil-to-plant Transfer Of 226 Rasupporting

confidence: 86%

“…CR was calculated as the ratio of total activity concentration on a dry mass basis (Bq kg -1 dry mass) in the plant (harvestable) to that in the soil [18].…”

Section: Evaluation Of Radionuclide Soil-to-plant Transfermentioning

confidence: 99%

“…On the other hand, the foliar uptake of terrestrial plants can become important in areas where single or chronic releases of radionuclides are likely to happen which result in much higher plant surface contamination than the uptake by roots from the contaminated soil [11]. Soil-to-plant transfer of 238 U and 226 Ra was reported for different plant species grown in soil contaminated with UMT [13][14][15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…In order to evaluate the soil-toplant transfer of radionuclides the plant-to-soil radionuclide concentration ratio needs to be determined. Concentrations ratio describes the accumulation of radionuclides in the plants [18] and is important parameter used in doseassessment methodology or phytoremediation efficiency evaluation. Plants having the metal concentration ratio greater than 1 are suitable for the phytoremediation technology [28].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Transfer of uranium and radium to Chinese cabbage from soil containing elevated levels of natural radionuclides

Smodiš

Černe

Jačimović

et al. 2015

J Radioanal Nucl Chem

View full text Add to dashboard Cite

The transfer of 238 U and 226 Ra to Chinese cabbage (Brassica rapa L. subsp. pekinensis (Lour.) Hanelt) was investigated from soils contaminated with uranium-mill tailings (UMT) by means of a pot experiment in laboratory-based conditions applying different levels of soil contamination under various growing conditions. Activity concentrations for 226 Ra in Chinese cabbage varied from 56-276, 156-502 and 277-877 Bq kg -1 dry mass for 20, 40 and 60 % of UMT content in the soil, respectively, and for 238 U from 1.0-2.3 and 2.3-4.7 Bq kg -1 dry mass for 40 and 60 % of UMT content in the soil, respectively. The results showed increased accumulation of 226 Ra and low accumulation of 238 U in cabbage leaves in more contaminated soil.

show abstract

Section: Soil-to-plant Transfer Of 226 Rasupporting

confidence: 86%

“…CR was calculated as the ratio of total activity concentration on a dry mass basis (Bq kg -1 dry mass) in the plant (harvestable) to that in the soil [18].…”

Section: Evaluation Of Radionuclide Soil-to-plant Transfermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Transfer of uranium and radium to Chinese cabbage from soil containing elevated levels of natural radionuclides

Smodiš

Černe

Jačimović

et al. 2015

J Radioanal Nucl Chem

View full text Add to dashboard Cite

show abstract

“…Similarly, 226 Ra activity concentrations in needles and leaves from different tree species were in the range from 0.1 to 201 Bq kg −1 and in rock substrates from 39 to 29,945 Bq kg −1 . In the study conducted by Madruga et al (2001), 226 Ra was determined in Pinus pinea and Eucalyptus globolus trees planted on the uranium milling waste dams of the Urgeiriça uranium mine. 226 Ra activity concentrations found in P. pinea needles were from 0.2 to 300 Bq kg −1 and in uranium mill tailings from 90 to 62,000 Bq kg −1 .…”

Section: Introductionmentioning

confidence: 99%

Natural radionuclides in trees grown on a uranium mill tailings waste pile

Štrok

Smodiš

Eler

2011

Environ Sci Pollut Res

View full text Add to dashboard Cite

Results showed that for all radionuclides, the highest activity concentrations were found in foliage, followed by shoots and wood. The activity concentrations in trees were from 0.01 to 5.4 Bq kg(-1) for (238)U, 0.03-11.3 Bq kg(-1) for (230)Th, 2.7-2,728 Bq kg(-1) for (226)Ra and 5.1-321 Bq kg(-1) for (210)Pb. All activity concentrations were calculated on dry weight basis. The calculated concentration ratios were from 1.05E-5 to 5.39E-3 for (238)U, 7.65E-6-2.88E-3 for (230)Th, 3.10E-4-3.16E-1 for (226)Ra and 6.70E-4-4.22E-2 for (210)Pb.

show abstract

Simulation of Liberation and Dispersion of Radon from a Waste Disposal

Dinis

Fiúza

Advances in Air Pollution Modeling for Environmental Security

View full text Add to dashboard Cite

Radon emissions from a radioactive waste disposal may constitute a major source of environment contamination and consequently a potential health hazard to the nearby population. Gaseous Radon-222 is generated from the radioactive decay of Radium-226 present in the tails. When it is formed, radon is free to diffuse along the pores of the residues to the surface and escape to the atmosphere. Waste management and long term stabilisation has a major concern in reducing radon emissions to near-background levels. The common theoretical approach is done by calculating the cover thickness that allows a radon flux inferior to a stipulated and accepted value. The fundamentals of the conceptual model are based in the principles of diffusion across a porous medium, which allows the mathematical description of the radon transport through the waste and the cover. The basic diffusion equations are used for estimating the theoretical values of the radon flux formed from the decay of the Radium-226 contained in the waste material. The algorithm incorporates the radon attenuation originated by an arbitrary cover system placed over the radioactive waste disposal. Once the radon is released into the atmosphere, it is available for atmospheric transport by the wind. Radon atmospheric dispersion is modelled by a modified Gaussian plume equation, which estimates the average dispersion of radon released from a point source representative of one or several uniform area sources. The model considers the medium point release between all the areas contaminated. The dispersion can be simulated in different wind directions, with different wind velocities, as well as in the dominant wind direction.

show abstract

226Ra bioavailability to plants at the Urgeiriça uranium mill tailings site

Cited by 40 publications

References 14 publications

Transfer of uranium and radium to Chinese cabbage from soil containing elevated levels of natural radionuclides

Transfer of uranium and radium to Chinese cabbage from soil containing elevated levels of natural radionuclides

Natural radionuclides in trees grown on a uranium mill tailings waste pile

Simulation of Liberation and Dispersion of Radon from a Waste Disposal

Contact Info

Product

Resources

About