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  • Thorium Wikipedia

    Concentration[edit]. There are two egories of thorium minerals for thorium extraction: primary and secondary. Primary deposits occur in acidic granitic magmas and pegmatites. They are concentrated, but of small size. Secondary deposits occur at the mouths of rivers in granitic mountain 

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  • (U) and Thorium (Th) IOPscience

    Abstract. The article deals with the research findings of peculiarities of REE, Uranium and. Thorium distribution in the territory surrounding the tailing of former Komsomolsk gold concentration plant according to the data from Betula pendula leaf testing. In the leaf element composition the slight deficiency of MREE and 

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  • Biomonitoring of environmental pollution by thorium and uranium in

    Mar 25, 2010 The distribution pattern of environmental pollution by uranium and thorium was evaluated by determining the thorium and uranium concentrations in plant samples (Artemisia austriaca) from the city of Aktau and comparing these results with those obtained for the same species of plants from an unpolluted 

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  • Thorium USGS Publiions Warehouse

    district is thought to contain the largest concentration of thorium resources in the United States and is the Van Gosen, B.S., Gillerman, V.S., and Armbrustmacher, T.J., 2009, Thorium deposits of the United States. Energy resources for the .. nuclear power plant, then considerable interest and activity will focus on thorium 

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  • Plant and Soil Relationships of Uranium and Thorium Decay Series

    Plant concentrations have been related to total contents of these radionuclides in the soil as a plant/soil concentration ratio (CR), even though the fraction of these radionuclides, which may be available to plants, is not well known. These CR values have been used to predict transport of radionuclides and other elements.

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  • assessment of natural radioactivity in water and sediment UKM

    Amang plants number 1 and 2 represent two different amang plants. S1S4 are sediment sampling stations around the ponds, and L1L4 are the sediment layer (L1 means top sediment layer and L4 means bottom sediment layer). Figures 1 and 2 show the mass and activity concentrations of uranium238 and thorium232 in 

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  • thorium resources of brazil exploration history unece

    Oct 18, 2012 thorium rare earths became the main product and thorium a byproduct. 1951 Implantation of three concentration plants in: Buena (RJ),. Cumuruxatiba (BA) and São Paulo (SP). 1960 CNEN acquires deposits of monazitic sands (coastal RJ, ES, BA) and the concentration plants of Buena, Cumuruxatiba 

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  • Thorium and uranium uptake and bioaccumulation by wheatgrass

    different plant parts, soil proteins, leaf chlorophyll. 1. Introduction. Generally soils and plants contain all naturally occurring radioactive elements, though their concentration in plants may be rather low. The migration of uranium and thorium in the environment is of major environmental concern (AIREY and IVANOVICH 1986 

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  • Critical compilation and review of plant/soil concentration r..INIS

    Critical compilation and review of plant/soil concentration ratios for uranium, thorium and lead · Sheppard, S.C. Evenden, W.G.. [en]. The transfer of natural radionuclides of the U decay series through the biosphere is important, especially for assessment of the impacts of mining and milling of U ores. The pathway from soil 

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  • Evolution of uranium and thorium minerals

    from ~4.5 to 3.5 Ga, involved successive concentrations of uranium and thorium from their initial uniform trace period, from ~3.5 to 2.2 Ga, saw the formation of large lowgrade concentrations of detrital uraninite fourth phase of uranium mineralization began ~400 million years ago, as the rise of land plants led to.

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  • Thorium As Nuclear Fuel: the good and the bad Whatisnuclear

    A discussion of the Thorium nuclear fuel cycle for nuclear reactors. How is it Like Uranium, its properties allow it to be used to fuel a nuclear chain reaction that can run a power plant and make electricity (among other things). Thorium is more abundant in Earth's crust than Uranium, at a concentration of 0.0006% vs.

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  • Natural uranium and the environment IRSN

    Aug 9, 2012 In the area around an uranium processing plant (less than 2 km), activity concentrations of uranium vary widely in the air from 1 to 900 µBq/m3 (Ahier and Tracy, 1997). Near an open air mine in operation, air concentration reaches 33 µBq/m3 (Thomas, 1997). At sites in Serbia and Montenegro where 

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  • Concentration levels of rareearth elements and thorium in plants

    Plants and soils from a natural thorium and rareearth element occurrence (Morro do Ferro,. Brazil) were analyzed by alpha spectrometry (Th) and ICPAES (REE), after preconcentration of the elements by solvent extraction, coprecipitation and ion exchange procedures. Leaching experiments with humic acid solutions 

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  • Critical Compilation and Review of Plant/Soil Concentration Ratios

    Critical Compilation and Review of Plant/Soil. Concentration Ratios for Uranium, Thorium and Lead. S. C. Sheppard & W. G. Evenden. Environmental Research Branch, Whiteshell Nuclear Research Establishment. Pinawa, Manitoba. Canada ROE Ik0. (Received 23 February 1988: revised version received 13 Slay 1988: 

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  • Phytoextraction of Thorium from Soil and Water Media SpringerLink

    Addition of a small amount of thorium to the media resulted in a significant increase of thorium concentration both in roots and leaves of the wheat seedlings. The uptake of Th by roots depended of the media where the plants grew: it was more significant in watergrown plants. The rate of Th transloion from roots to leaves 

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  • Recovery of trace elements with uranium and thorium from Yatagan

    leaching tests were: 30% solid concentration, 2.36 mmol/dm3 HCl addition, 240 min leaching time and 40. oC temperature. Dissolution efficiencies for uranium and thorium from the Yatagan Thermal Power Plant fly ashes were calculated as 90.12 and 81.18%, respectively. Keywords: uranium, thorium, leaching, fly ash.

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  • Economics of Thorium and Uranium Reactors

    Apr 30, 2013 Thorium Reactor (LFTR), it can potentially be a source of nuclear power that is cheaper, cleaner, and safer compared to current uranium power plants. This investigation explores . 1 kg of enriched uranium. 9. The UF6 produced in the conversion process however is not high enough in U235 concentration.

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  • Critical Compilation and Review of Plant/Soil Concentration Ratios

    Critical Compilation and Review of Plant/Soil. Concentration Ratios for Uranium, Thorium and Lead. S. C. Sheppard & W. G. Evenden. Environmental Research Branch, Whiteshell Nuclear Research Establishment. Pinawa, Manitoba. Canada ROE Ik0. (Received 23 February 1988: revised version received 13 Slay 1988: 

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  • Determination of the elemental concentration of uranium and

    monazite, zircon, xenotime, ilmenite etc. Besides that, the tailings from these ores may have a significant potential source of radiation exposure to amang plants' workers. This study was conducted to determine the elemental concentration of uranium and thorium in mineral samples collected from five amang tailing factories.

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  • thorium resources of brazil exploration history unece

    Oct 18, 2012 thorium rare earths became the main product and thorium a byproduct. 1951 Implantation of three concentration plants in: Buena (RJ),. Cumuruxatiba (BA) and São Paulo (SP). 1960 CNEN acquires deposits of monazitic sands (coastal RJ, ES, BA) and the concentration plants of Buena, Cumuruxatiba 

    Online
  • Concentration levels of rareearth elements and thorium in plants

    Plants and soils from a natural thorium and rareearth element occurrence (Morro do Ferro,. Brazil) were analyzed by alpha spectrometry (Th) and ICPAES (REE), after preconcentration of the elements by solvent extraction, coprecipitation and ion exchange procedures. Leaching experiments with humic acid solutions 

    Online
  • Radionuclide Basics: Thorium Radiation Protection US EPA

    May 8, 2017 Natural thorium is present in trace quantities in virtually all rock, soil, water, plants and animals. Where higher concentrations occur in rock or sands, thorium may be mined and refined, producing waste products such as mill tailings. If not properly controlled, wind and water can introduce the tailings into the 

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  • Thorium World Nuclear Association

    Monazite is found in igneous and other rocks but the richest concentrations are in placer deposits, concentrated by wave and current action with other heavy minerals. World monazite resources . In Norway, Thor Energy is developing and testing two thoriumbearing fuels for use in existing nuclear power plants. Fuel rods 

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  • inhalation and retention of thorium dusts by mineral sands workers

    0.06 is the average thorium content of monazite. Dg is the arithmetic mean gravimetric dust concentration, mg m~3. SATh is the specific activity of 232Th, 4.1 Bq mg""1. MHMC is the average monazite content of heavy mineral concentrate. The mean gravimetric dust concentration for separation plant workers was obtained 

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  • Behavior and Distribution of Heavy Metals Including Rare Earth

    Feb 29, 2012 In order to investigate the behavior, distribution, and characteristics of heavy metals including rare earth elements (REEs), thorium (Th), and uranium (U) in sludge, the total and fractional concentrations of these elements in sludge collected from an industry water treatment plant were determined and 

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  • Critical compilation and review of plant/soil concentration ratios for

    J.H. CushmanAn analytical solution to solute transport near root surfaces for low initial concentration: II. Appliions. Soil Sci. Soc. Amer. J., 43 (1979), pp. 10901095. Dave et al., 1984. N.K. Dave, T.P. Lim, N.R. CloutierRadionuclide Uptake by Various Plants Growing on Uranium Tailings, Elliot Lake, Ontario. Minerals 

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  • Critical compilation and review of plant/soil concentration ratios for

    J.H. CushmanAn analytical solution to solute transport near root surfaces for low initial concentration: II. Appliions. Soil Sci. Soc. Amer. J., 43 (1979), pp. 10901095. Dave et al., 1984. N.K. Dave, T.P. Lim, N.R. CloutierRadionuclide Uptake by Various Plants Growing on Uranium Tailings, Elliot Lake, Ontario. Minerals 

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  • 67 5. POTENTIAL FOR HUMAN EXPOSURE 5.1 OVERVIEW

    POTENTIAL FOR HUMAN EXPOSURE impoundments of uranium tailings containing elevated levels of thorium had a plant/soil concentration ratio of about 3 (Ibrahim and Whicker 1988). The atmospheric mass concentration of thorium ranged from 0.21.0 ng/m. 3., with a mean value of 0.3 ng/m. 3 in air samples collected 

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  • Uptake by plants of radionuclides from FUSRAP waste materials

    FIGURES. Figure. Page. 1.1. Uranium238 Decay Series. 12. TABLES. Table. Page. 2.1. Concentration Ratios of Uranium for a Variety of Plant Species. 23. 2.2. Concentration Ratios of Thorium230 for a Variety of Plant Species. 25. 2.3. Concentration Ratios of Radium226 for a Variety of PUnt Species. 26. VI 1 1 

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  • Uptake of uranium and thorium by native and cultivated plants (PDF

    Mar 24, 2018 complied. The aim of this work is to discuss some of the factors affecting. uptake of uranium and thorium by plants, including relationships. between these radionuclides in soil and in plants and temporal. changes of uranium and thorium concentrations in different plant. species. 2. Materials and methods.

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