Browsing by Subject "Uranium"
Now showing items 1-20 of 31
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Alpha radiometry of uranium in surface and ground waters by liquid scintillation counting after separation of the radionuclide by cation exchange
(2008)The alpha radioactivity of surface and ground water samples has been determined by liquid scintillation counting (LSC) after chemical preparation of the samples by cation exchange using the Chelex 100 resin. The method ...
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Application of different types of resins in the radiometric determination of uranium in waters
(2011)The aim of this study is to compare different resins regarding their separation and pre-concentration efficiency for uranium from aqueous solutions and its subsequent radiometric determination by liquid scintillation ...
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A comparative study of the adsorption of uranium on commercial and natural (Cypriot) sea sand samples
(2013)The adsorption of hexavalent uranium on two different types of sea sand [e.g. a local, Cypriot (N-SS) and a commercially available marine sediment (C-SS)] has been investigated as a function of pH, initial metal concentration, ...
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A comprehensive study of natural gamma radioactivity levels and associated dose rates from surface soils in Cyprus
(2004)A survey was carried out to determine activity concentration levels and associated dose rates from the naturally occurring radionuclides 232Th, 238U and 40K, in the various geological formations of Cyprus, by means of ...
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Determination of thorium, uranium and potassium elemental concentrations in surface soils in Cyprus
(2004)A comprehensive study was conducted to determine thorium, uranium and potassium elemental concentrations in surface soils throughout the accessible area of Cyprus using high-resolution γ-ray spectrometry. A total of 115 ...
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The effect of physicochemical parameters on the separation recovery of plutonium and uranium from aqueous solutions by cation exchange
(2010)The effect of physicochemical parameters such as pH, salinity (e.g. [NaCl]) and competitive cation (e.g. Ca 2+ and Fe 3+) concentration on the separation recovery of plutonium and uranium from aqueous solutions by cation ...
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Effect of surface and textural characteristics on uranium adsorption by nanoporous titania
(2017)TiO2 solids of different grain size have been prepared by micelle-mediated hydrolysis and a solvothermal method, and characterized by SEM microscopy and N2 adsorption. The effect of the BET surface area/pore volume and the ...
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Experimental and theoretical studies on physico-chemical parameters affecting the solubility of phosphogypsum
(2009)Phosphogypsum is a waste by-product of the phosphate fertilizer industry, which is usually disposed in the environment because of its restricted use in industrial applications. Physico-chemical conditions existing in stack ...
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Gamma radiation measurements and dose rates in commercially-used natural tiling rocks (granites)
(2003)The gamma radiation in samples of a variety of natural tiling rocks (granites) imported in Cyprus for use in the building industry was measured, employing high-resolution γ-ray spectroscopy. The rock samples were pulverised, ...
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Gamma-ray measurements of naturally occurring radioactive samples from Cyprus characteristic geological rocks
(2003)Using high-resolution gamma-ray spectroscopy, the terrestrial gamma radiation in all the predominant types of geological rock formations appearing in Cyprus was measured. Soil samples were collected from each rock type, ...
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Investigation on uranyl interaction with bioactive ligands. Synthesis and structural studies of the uranyl complexes with glycine and N-(2-mercaptopropionyl)glycine
(2002)Three new uranium(VI) compounds have been prepared with glycine (Hgly), N-(2-mercaptopropionyl)glycine (Hmpg) and 2,2′-dithiobis(N-propionylglycine) (tpg). The crystal structure of [UO2(Hgly)2Cl2] has been solved, revealing ...
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Natural radioelement concentration in the Troodos Ophiolite Complex of Cyprus
(2005)High-resolution γ-ray spectrometry was exploited to determine naturally occurring thorium (Th), uranium (U) and potassium (K) elemental concentrations in the whole area covered by the Troodos Ophiolite Complex of Cyprus. ...
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Redox chemistry of sulphate and uranium in a phosphogypsum tailings dump
(2010)The present study aims to assess the effect of redox conditions existing within the tailings dump on the stability of phosphogypsum (e.g. sulphate reduction) and uranium(VI). Phosphogypsum sampling and in-situ measurements ...
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Seasonal variation of the alpha-radioactivity concentration in natural water systems in Cyprus
(2011)The study deals with the seasonal variation of the total alpha-radioactivity and the U-238/234 radioactivity concentration of ground waters in Cyprus. The radiometric measurements were performed after pre-concentration and ...
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Seasonal variation, chemical behavior and kinetics of uranium in an unconfined groundwater system
(2014)The seasonal changes in the concentration of uranium in an unconfined groundwater system in Cyprus have been investigated and compared to corresponding changes of boron and salinity, to better understand the chemical ...
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Selective separation of radium and uranium from aqueous solutions by Chelex-100
(2012)The affinity of Chelex-100 for radium has been investigated as a function of pH and salinity compared to the Chelex-100 affinity for uranium to assess possible application of the resin for the selective separation of the ...
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Simplified alpha-spectroscopic analysis of uranium in natural waters after its separation by cation-exchange
(2010)A relatively rapid, economic and robust procedure is described for the alpha-radiometric analysis of natural waters. The analysis is performed by alpha-spectroscopy after pre-concentration and separation of uranium by ...
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Simplified determination of uranium in contaminated sea sand samples by alpha-spectroscopy after acidic desorption and liquid–liquid extraction
(2015)For the determination of uranium in contaminated sea sand samples by alpha-spectroscopy, we have investigated the applicability of different pre-analytical procedures. The direct electrodeposition after acidic dissolution ...
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A simplified determination of uranium in phosphate rock and phosphogypsum by alpha-spectroscopy after its separation by liquid-extraction
(2012)A relatively rapid, economic and robust procedure is described for the radiometric analysis of uranium in phosphate rock and phosphogypsum. The analysis is performed by alpha spectroscopy after pre-concentration and ...
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Speciation and spectrophotometric determination of uranium in seawater
(2004)A series of ion-exchange and extraction procedures for the separation of uranium from seawater samples and subsequent spectrophotometric determination of uranium in seawater by means of arsenazo(III) is described. According ...