Thorium, Uranium and Rare Earth Elements Content In Lanthanide Concentrate (LC) And Water Leach Purification (WLP) Residue Of Lynas Advanced Materials Plant (LAMP) ... [Show full abstract] 184.5 ...
Abstract This paper addresses the development of a process to recovery uranium, thorium and rare earth elements from an industrial residue, with a subsequent removal of U and Th from the liquor generated. Sulfuric acid digestion followed by water leaching was found to be the best method to solubilise the metals. The acid digestion was carried out with an acid sample ratio of 700 kg t−1 and a ...
—————, 1964 —Thorium, Uranium and Potassium Concentrations in Hawaiian Lavas. Nature, vol. 201, p. 254–56. Article Google Scholar —————, 1963 —Radiometric determination of thorium, uranium and potassium in basalts and in two magmatic differentiation serie. Geochim. et Cosmochim.
PDF | On Oct 1, 2021, F. M. Khaleal and others published Separation of Uranium and Thorium from Mica-Rich Schist Bands Concentrate of Wadi Abu Rusheid Area, South Eastern Desert, Egypt | Find ...
Closed Thorium-Uranium-Plutonium Cycle Concept in Nuclear Power Engineering Marshalkin, V. E. Abstract. The use of 232 Th instead of 238 U as a fertile isotope, 233 U instead of 239 Pu as the main fissile isotope, heavy water instead of light water as a coolant, and its dilution with light water in the VVER reactor campaign make possible self ...
Thorium is 3 to 4 times more abundant than uranium and is widely distributed in nature as an easily exploitable resource in many countries. Unlike natural uranium, which contains ∼0.7% fissile {sup 235}U isotope, natural thorium does not contain any fissile material and is made up of the fertile {sup 232}Th isotope only.
Abstract. Selected samples of waste microbial biomass originating from various industrial fermentation processes and biological treatment plants have been screened for biosorbent properties in conjunction with uranium and thorium in aqueous solutions. ... The biomass of Rhizopus arrhizus at pH 4 exhibited the highest uranium and thorium ...
Abstract and Figures. ... of South Eastern part of Wadi Baroud microgranite which revealed that the main mineral associations were represented by uranium, thorium and rare earth elements (REEs ...
Abstract Evaluated has been bioconcentration potential by fungi and risk to human consumers from exposure to natural long-lived radioactive uranium (234 U, 238 U) and thorium (230 Th, 232 Th) sequestered in stems, caps and the whole fruiting bodies by mushrooms of the genus Leccinum and Leccinellum. Edible species in the study were collected ...
Abstract. WITH ions from a spark between a thorium or uranium electrode and a tin electrode, it was found that easily resolved doublets are given by the mass-spectrograph, formed by the doubly ...
Abstract The distribtuion of uranium and thorium in soils and weathered ... Uranium, thorium, strontium, and barium were apparently leached from the upper, calichified part of the soil profile and con centrated on .the zeolitic-bedrock material below. The amount of
The extraction behavior of uranium, thorium and lanthanides, represented by cerium and ytterbium, by Cyanex-923 has been investigated. The effect of different variables like the concentration of acids, metal ion and extractant, nature of diluent and temperature has been studied. A composition for the extracted U(VI) and Th(IV) species has been proposed. Based on the partition data some ...
abstract = "Oxygen reduction and hydrogen peroxide reduction are technologically important reactions in the fields of energy generation and sensing. Metal-doped graphenes, where metal serves as the catalytic center and graphene as the high area conductor, have been used as electrocatalysts for such applications. ... T1 - Uranium- and thorium ...
Abstract. We measured uranium and thorium in urine of 500 U. S. residents to establish reference range concentrations using a magnetic-sector inductively coupled argon plasma mass spectrometer (ICP-MS). We found uranium at detectable concentrations in 96.6% of the urine specimens and thorium in 39.6% of the specimens. The 95th percentile ...
The thorium-to-uranium ratios in sedimentary rocks range from less than 0.02 to more than 21. Ratios in many oxidized continental deposits are above 7, whereas most marine deposits have ratios much below 7. Thus, the thorium-to-uranium ratio varies with sedimentary processing and depositional environment.
Abstract. The behavior of uranium and thorium ions in nanofiltration (NF) from aqueous solutions has been studied. It was shown that the retention capacity (R) of the NF membrane for uranium and thorium depends on their state in aqueous solutions.In the case of uranium, the smallest values of R (82–83%) are observed when uranium is in solution as uranyl ions or oxyhydrate complexes at pH …
Abstract. Pomegranate peel was investigated as biosorbent to remove uranium as well as thorium from aqueous solutions under different experimental conditions (concentration, counter ions, temperature). The material was used in raw and modified form after treatment with acidic and alkaline solutions to increase its sorption capacity.
We report a comparison of the molecular and electronic structures of dithio- and diselenophosphinate, (E2PR2)1– (E = S, Se; R = iPr, tBu), with thorium(IV) and uranium(IV) complexes. For the thorium dithiophosphinate complexes, reaction of ThCl4(DME)2 with 4 equiv of KS2PR2 (R = iPr, tBu) produced the homoleptic complexes, Th(S2PiPr2)4 (1S-Th-iPr) and Th(S2PtBu2)4 (2S-Th-tBu). The ...
Abstract Owing to their natural radioactivity, uranium (U) and thorium (Th) play significant roles in environmental sciences for monitoring radiation dose and in geological sciences for understanding sedimentary processes. The Odisha coastal area, in eastern India, is a well-known high background radiation area that is rich in monazites and ...
uranium and thorium recoveries are 80% or better, uranium and thorium separation is nearly quantitative, and the resolution of thorium spectra is sufficient to allow the use of229Th as a tracer. Uranium is traced with purified 232U. The oral presentation will include results obtained after the submission of the extended abstract below.
Abstract. Rare earths play critical roles in the advanced materials industry and recently, rare earth recovery from new sources attracts much interest. Radioactive elements of uranium and thorium are usually associated with rare earth deposits. Therefore, radiation contamination and safety issues are often of a great concern.
ABSTRACT Key Words: Beach sands harbor appreciable amount of radioactive elements such as Radioactive minerals, zircon which contains some important and radioactive elements (e.g. uranium, Beach placers, Separation flow chart, XRD, Neutron thorium).
The difference, which corresponds to the net activity of exposed uranium oxide, showed a half-life of 6.5 d. An uranium isotope having a half-life of 6.5 d was unknown at that time. Nishina and Kimura considered that this isotope would be produced by the (n, 2n) reaction, just as in the case of producing 231 Th from 232 Th, shown in Eq. .
Abstract. The uranium and thorium contents of 199 igneous rocks from a variety of petrographic provinces are here summarized. Data are given for the Mesozoic calcalkalic batholiths of the western United States; volcanic and hypabyssal rocks of the tholeiitic magma type from Hawaii and ia; and effusive calc- alkalic, alkalic, and subsilic-alkalic rocks from the western United States and ...
Uranium and thorium are two common natural radioactive elements with high concentrations in Earth's crust. The main aim of this study is to estimate the inhaled effective dose of uranium and thorium caused by a typical radioactive rare earth ore to the occupational population and the surrounding public. The particulate matter (PM) concentrations in the atmosphere of four typical workplaces ...
Uranium-Thorium dating, join beta analytic's free webinar presented by dr. we reconstruct a rock or mineral that can be limited to thorium-230. Abstract. uranium-thorium-lead dating, derivation of origin of the dominant uranium, is uranium-thorium dating because the amount of 238u and flowstone samples. Uranium thorium dating
Abstract. The thorium and uranium contents of the volcanic and ancient terra formations of Mars are evaluated on the basis of Mars-5 space probe measurements of gamma radiation from the Martian surface. Gamma-ray data for two partially overlapping territories containing different proportions of the major Martian geological formations were ...
Uranium and Thorium Determination in Water Samples Taken along River Kura. Journal of Materials Science and Engineering B, 2016. Famil Humbatov. Download PDF. Download Full PDF Package. This paper. A short summary of this paper. 37 Full PDFs related to this paper. Read Paper. Download PDF.
Abstract Rich uranium-copper mineralization occurs in metasediments adjacent to and mantling the older granites and gneisses of the Rum Jungle complex. The uranium and thorium content of these older rocks, measured by gamma-ray spectrometry, is more than twice the …
Abstract. New pieces to the puzzle! Thorium and uranium oxide nanocrystals with various sizes and shapes were synthesised by a non-aqueous colloidal method (see figure). The role of various experimental parameters (e.g., composition of the organic system, nature of the actinide precursor and nature of the actinide element) to control the final ...
پست الکترونیک: [email protected]
نشانی: شماره 1688، جاده شرقی گاوک، منطقه جدید پودونگ، شانگهای، چین.
کپی رایت © 2024.cryptod تمامی حقوق محفوظ است.نقشه سایت