The determfination of uranium, thorium, yttrium, zirconium and …
Zirconium, hafnium and vttrium can be determined directly. Thorium is measured after an extraction/concentration step with tri-n-octylphosphine oxide, and back-extraction into dilute sulfuric acid. Uranium was more easily determined bya the fused-pellet fluorimetric method.
Naturally-occurring radioactive materials and the regulatory …
Uranium-238 in natural zirconia 3 – 13 Thorium-232 in natural zirconia 0.1 – 26 Most zirconia (ZrO 2) is manufactured from zircon due to the scarcity of natural zirconia. The radioactivity content of manufactured zirconia depends on the activity of …
SOME DATE ON THE ANALYSIS OF URANIUM, THORIUM, AND ZIRCONIUM …
The U.S. Department of Energy's Office of Scientific and Technical Information
Natural Decay Series: Uranium, Radium, and Thorium
Uranium-238 also decays by spontaneous fission. Uranium-234 Thorium-230 α 240,000 years Radium-226 Radon-222 α 1,600 years α 3.8 days Uranium-238 Thorium-234 α 4.5 billion years 24 days β 1.2 minutes Bismuth-210 Polonium-210 α 140 days 22 years β 5.0 days Lead-206 (stable) Bismuth-214* Polonium-214 α 160 microseconds 27 minutes β 20 ...
Thermal diffusivity measurement of uranium-thorium-zirconium …
The uranium-thorium mixed zirconium hydrides of UTh 4 Zr 10 H x (x = 20, 24, 27) have been successfully fabricated without large crack by means of a Sieverts apparatus. The scanning electron microscope (SEM) and X-ray diffraction (XRD) analyses show that UTh 4 Zr 10 H x consist of α-U, ThZr 2 H x, and (δ, ε)-ZrH x .
CN104263930A - Method for extraction separation of uranium from thorium ...
According to the method, the extraction rate of uranium is higher than 99%, the extraction rates of thorium, scandium, zirconium and titanium are lower than 0.5%, and the separation effect is …
Uranium and thorium | Geoscience Australia
Uranium and thorium are not stable. They break down in a process called radioactive decay. More than 99% of natural uranium exists in a form (isotope) called uranium-238 while more than 99% of natural thorium exists as thorium-232. These metals decay very slowly eventually to …
Spectrophotometric determination of zirconium, uranium, …
Separation of zirconium, uranium, thorium, and rare earths The conditions for the separation of zirconium from thorium,6 uranium from thorium,6'7 and thorium and uranium8 have been already clarified. Separation of rare earths by TTA extraction was previously studied." On the basis of these investigations a scheme has been evolved for the ...
Separation of Thorium from Zirconium Carbide Waste by Liquid–Liquid ...
Separation of thorium from zirconium carbide waste is reported. The waste typically contains zirconium, yttrium, uranium, and thorium, along with other impurities including rare earth elements (REEs), iron, calcium, aluminum, hafnium, and titanium. The first step in the separation was selective leaching of zirconium, uranium, and most other impurities with HNO3–HF, …
Periodic Table Element Comparison | Compare Zirconium vs Thorium …
The element Zirconium was discovered by H. Klaproth in year 1789 in Germany. Zirconium derived its name from Persian Zargun, 'gold-colored'; German Zirkoon, 'jargoon'. The element Thorium was discovered by J. Berzelius in year 1829 in Sweden. Thorium derived its name from Thor, the Scandinavian god of thunder. Discovery: H. Klaproth (1789) J ...
Uranium and Thorium in Zircon Sands Processe d in …
Uranium and Thorium in Zircon Sands Processe d in Northeastern Brazil Clovis A. Hazina* Mari, a Helena P .Gazineub' Emersoc, n E. G. de Fariasa aCentro Regiona dl e Ciência Nucleares/CNEs N - Av. Prof Lui. z Freire 200, 50740-540, . Recife PE Brasil. bUniversidade ólic dae Pernambuc -o Ru dao Príncipe 526, 50050-900, Recif.PeE Brasil. cInstituto de …
The determfination of uranium, thorium, yttrium, zirconium and …
The most prominent thorium lines suffered from uranium, zirconium, and titanium interferences. The line at 353.96 nm is less intense than was required; hence the extraction was designed to provide both a cleaner matrix and a …
Periodic Table Element Comparison | Compare Thorium vs Zirconium …
The element Thorium was discovered by J. Berzelius in year 1829 in Sweden. Thorium derived its name from Thor, the Scandinavian god of thunder. The element Zirconium was discovered by H. Klaproth in year 1789 in Germany. Zirconium derived its name from Persian Zargun, 'gold-colored'; German Zirkoon, 'jargoon'. Discovery: J. Berzelius (1829) H ...
THORIUM, URANIUM AND ZIRCONIUM …
The thoriumto-uranium ratios ranged from 1.5 to 20.9, with an average value of 5.1. Zirconium determinations on some of the bauxites gave values ranging from 0.02 to 0.65% zirconium, and averaging 0.09% zirconium. The thorium, uranium, and zirconium contents of the bauxites were related to the type of source rock.
Determination of Thorium, Uranium and Zirconium with …
Derivative spectrophotometry of the 3rd-order was used to determine microgram amounts of Th, U(VI) and Zr with Arsenazo III. Complexes of these metals with the reagent form in a strongly acidic (4 M HClO4) and 2-propanol-water (25%(v/v)) medium. Optimal apparatus parameters and the way of obtaining derivative spectra were established. A determination of …
PHOTOLYTIC SEPARATION OF URANIUM FROM THORIUM, ZIRCONIUM…
OSTI.GOV Journal Article: PHOTOLYTIC SEPARATION OF URANIUM FROM THORIUM, ZIRCONIUM, AND MANGANESE. PHOTOLYTIC SEPARATION OF URANIUM FROM THORIUM, ZIRCONIUM, AND MANGANESE. Full Record; Other Related Research;
Natural Decay Series: Uranium, Radium, and Thorium
FIGURE 1. Uranium-238 Radioactive Decay Series Lead-206 (stable) Polonium-210 Lead-210 Bismuth-214* Polonium-214 Bismuth-210 Radium-226 Radon-222 Polonium-218 Lead-214* Uranium-238 Thorium-234 Protactinium-234m Uranium-234 Thorium-230 α 77,000 years α 1,600 years α 3.8 days α 3.1 minutes α 160 micro-seconds α 140 days 1.2 minutes 24 days ...
Spectrophotometric determination of zirconium, uranium, thorium …
A method is described for the spectrophotometric determination of microgram amounts of zirconium, uranium(VI), thorium and rare earths with Arsenazo III after systematic separation by extraction. First zirconium is extracted into a xylene solution of thenoyltrifluoroacetone (TTA) from about 4M hydrochloric acid. Uranium(VI) is then extracted ...
Simultaneous spectrophotometric determination of trace amounts …
The enrichment factor for preconcentration of uranium, thorium, and zirconium was found to be 100. The detection limits for U(VI), Th(IV) and Zr(IV) were 0.50, 0.54, and 0.48microgL(-1), respectively. The precision of the method, evaluated as the relative standard deviation obtained by analyzing a series of 10 replicates, was below 4% for all ...
(PDF) Some Studies on the Uranium - Thorium - Zirconium
Determination of Thorium, Uranium and Zirconium With Arsenazo III Using Third-Order Derivative Spectrophotometry. Analytical Sciences Analytical Chemistry 1992English Synthesis and Characterization of Some Binary and Ternary Zirconium Iodides 1981English The URANIUM-RICH END OF THE URANIUM-ZIRCONIUM SYSTEM. Final Report- Metallurgy …
Fabrication and characterization of uranium–thorium–zirconium …
Two uranium–thorium–zirconium hydrides, (UTh 4 Zr 10)H 1.9 and (U 4 Th 2 Zr 9)H 1.5, have been fabricated and characterized. Fabrication involved arc melting of the constituent pure metals to form homogenous alloys, followed by hydriding at elevated temperatures in a hydrogen gas environment. The compounds were characterized by X-ray …
Spectrophotometric determination of zirconium, uranium, …
A method is described for the spectrophotometric determination of microgram amounts of zirconium, uranium(VI), thorium and rare earths with Arsenazo III after systematic separation by extraction. First zirconium is extracted into a xylene solution of thenoyltrifluoroacetone (TTA) from about 4M hydrochloric acid.
Recovery of uranium and thorium from zirconium oxychloride …
A solvent extraction process is proposed to recover uranium and thorium from the crystal waste solutions of zirconium oxychloride. The extraction of iron from hydrochloride medium with P350, the extraction of uranium from hydrochloride with N235, and the extraction of thorium from the mixture solutions of nitric acid and the hydrochloric acid with P350 was investigated. The …
SOME DATE ON THE ANALYSIS OF URANIUM, THORIUM, AND …
The U.S. Department of Energy's Office of Scientific and Technical Information
Thorium, uranium and zirconium concentrations in bauxite
@article{Adams1960ThoriumUA, title={Thorium, uranium and zirconium concentrations in bauxite}, author={John A. S. Adams and Kyle Richardson}, journal={Economic Geology}, year={1960}, volume={55}, pages={1653-1675} } ... Abstract Thorium, uranium and potassium have been determined in nine tektites and two Peruvian glasses by a non-destructive ...
Thorium, uranium and zirconium concentrations in bauxite
The U concentrations range from 2.7 to 26.7 p.p.m. and average 11.4 p.p.m. The Th-to-U ratios range from 1.5 to 20.9, with an average value of 5.1. Zr determinations on some of the bauxites gave values ranging from 0.02 to 0.65% Zr, and averaging 0.09% Zr. The Th, U, and Zr contents of the bauxites are related to the type of source rock.
ANALYSIS OF URANIUM, THORIUM AND ZIRCONIUM
The U.S. Department of Energy's Office of Scientific and Technical Information
TENORM: Oil and Gas Production Wastes | US EPA
Uranium and its decay products. Thorium and decay products. Radium and decay products. Potassium-40. Lead-210/Polonium-210. Much of the petroleum and natural gas developed in the U.S. was created in the earth's crust at the site of ancient seas by the decay of sea life. As a result, these shale, petroleum and gas deposits often occur in ...
Complexation of zirconium(IV), thorium(IV) and uranium(VI) …
The adsorption of zirconium, thorium, and uranium malonate complexes on fiber materials filled with AV-17, EDE-10p, and AN-31 anion exchangers and ANKB-50 polyampholite is studied by diffuse reflection spectroscopy, and their complexation with Arsenazo III and Arsenazo M in the solid phase is studied. The influence of the basicity of the bulk agent, …
Recovery of uranium, thorium and zirconium from allanite by …
In nature, uranium, thorium and zirconium are invariably associated with lanthanides and their mutual separation is of vital significance. Most of the natural sources of these elements are lean and elegant separation schemes are required to meet the stringent demands of purity and recovery.
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