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تشنغتشو ، الصين

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uranium thorium determined

A comparison of analytical methods for determining

The results for uranium and thorium concentrations determined by gamma spectrometry, alpha spectrometry and ICP-MS were in good agreement. Also the on-site measurements with portable XRF gave comparable results to other methods used in this Uranium and thorium contents have been determined in a variety of natural material samples. • SSNTD means critical angles as a function the alpha particle energy Determination of uranium and thorium contents in various

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Determination of uranium and thorium concentrations in

In this study, uranium and thorium concentrations in the sediment samples collected from the Gulf of Izmit in Marmara Sea were determined using neutron uranium ore activity in Brazil were analyzed. The efficiency curve determined by Olivares, D. (2016) was used for quantifying the amount of uranium, Determination of Uranium and Thorium using Gamma

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Hydrothermal synthesis of homogenous and size-controlled uranium

In a second step, the pH of the solution was increased to 3 in order to extract both thorium and uranium. Thorium content was finally determined through the Uranium was more easily determined by the fused-pellet fluorimetric method. This scheme proved to be very successful, yielding results with apparent The determfination of uranium, thorium, yttrium, zirconium

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A comparison of analytical methods for determining uranium and thorium

The results for uranium and thorium concentrations determined by gamma spectrometry, alpha spectrometry and ICP-MS were in good agreement. Also the on-site irradiation, in order to determine the uranium, and again after 15 days of the irradiation, for the thorium determination; the thermal samples were counted after 7 DETERMINATION OF URANIUM AND THORIUM BY

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Determination of dissolved natural thorium and

Thermodynamic analysis for thorium and uranium concentrations measured after 10 kDa membrane filtration (square and circle plots, respectively) at the MIU: (left) the fraction of soluble species at pH = 8.6, Eh = −0.190 V, and The difference in the contents produced was found to be slight. The content of potassium differed by not over 1% of the measured quantity; of uranium, by 6% ;and of thorium, by 5%. Furthermore, the contribution of z4Na, via the reaction z3Na (n, y) 24Na, was determined from model experiments, which confirmed the calculated data.The content of uranium, thorium, and potassium in the rocks

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Department of Energy

not include source material."). Natural and depleted uranium are "source material," as defined in section l lz. of the AEA. See AEA §l lz., 42 U.S.C. §2014(z) ("The term `source material' means (1) uranium, thorium, or any other material which is determined by the Commission pursuant to the provisions of section 2091 of thisThe purpose of this study was to systematically analyze the leaching process of radionuclides from a decommissioned uranium tailings. About 40% of all forms of uranium are harmful to the environment. The particle size of soil are the main factors affecting the leaching amount. Uranium and thorium have migrated again under the Release behavior uranium and thorium in soil from a

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An innovative spectrophotometric method for determination of uranium

3-aminomethylalizarn-N-N diacetic acid chromogenic dye (AMADA) was used for the first time in uranium and thorium spectrophotometric estimation with accurate and sensitive result, their complexes having a maximum absorbance at 575 nm for U and at 510 nm for Th. This system allows uranium and thorium content to be calculated with a The activity concentrations of uranium and thorium isotopes in the separated sources were determined by alpha spectrometry with PIPS semiconductor detectors of 600 mm 2 active area, housed in Alpha Analyst model 7200-08. The radiotracers used for the determination of chemical yield in uranium and thorium A comparison of analytical methods for determining uranium and thorium

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Minerals Free Full-Text Recovery of Uranium, Thorium, and

Eudialyte-group minerals are of scientific interest as important concentrators of rare elements (mainly Zr and REE) in agpaitic alkaline rocks and a potential source of REE, Zr, Hf, Nb, and Ta for industrial use. Extraction of uranium(VI), thorium(IV), zirconium(IV), hafnium(IV), titanium(IV), and scandium(III) by a binary extractant based Kamata et al. proposed a method of sample preparation and liquid–liquid extraction for determination of thorium and uranium in coal ash samples. The elements were separated from the matrix by 2-thenoyltrifluoroacetone (TTA), and then uranium and thorium were back-extracted with diluted acid solution and determined by ICP-OES.Uranium determination using atomic spectrometric

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Frontiers Release behavior of uranium from a uranium

Uranium waste rock and tailing slag will gradually release radioactive metal elements such as uranium and thorium under atmospheric erosion and rain 25 cm, and 35 cm are collected from top to bottom for digestion. The total amount of uranium is determined experimentally. It can be seen from the distribution figure that the contentIn this work, a novel procedure was developed to separate thorium from uranium ore, consisting of leaching, liquid–liquid extraction, precipitations and ion exchange chromatography. The final product was 91.32 ± 0.77 mg of thorium with a purity of 99.5 ± 1.2 wt%. Of that, 7.65 ± 0.10 mg was 230 Th and the remainder 232 Th.Separation of thorium from uranium ore SpringerLink

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The determfination of uranium, thorium, yttrium, zirconium

Zirconium, hafnium and yttrium can be determined directly. Thorium is measured after an extraction/concentration step with trin-octylphosphine oxide, and back-extraction into dilute sulfuric acid. Uranium was more easily determined by the fused-pellet fluorimetric method. This scheme proved to be very successful, yielding results with Abstract—The paper presents major tendencies in the distribution of potassium, uranium, thorium, and Th/U ratio throughout the facies profiles of the main Mesozoic sedimentation basins of the West Siberian plate. The potassium and thorium behavior is determined by the number and position of source areas and the degree of Natural Radioactive Elements as Indicators of Conditions of

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On the determination of transportation, range and

232 Th is the initial isotope of the thorium decay chain and it occurs effectively throughout natural thorium. In other isotopes, uranium and thorium are associated with a small amount in relation to short-lived decomposition products. 232 Th is decayed by alpha emission and has a half-life of 1.405 × 10 10 years. This value is three timesWe provide a compilation of geology of uranium and thorium potential resources in the Ordovician black shale (graptolite argillite), Cambrian–Ordovician shelly phosphorite and in the secondary resources (tailings) of Estonia. Historical and new geological, XRF and ICP-MS geochemical data and ArcGIS modeling results of Minerals Free Full-Text Uranium and Thorium Resources of Estonia

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Nanofiltration Extraction of Uranium and Thorium from

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 The amounts of uranium and thorium were determined by comparison with fission yields produced by loon standards prepared by spreading known amounts of uranium and thorium over the same kind of filter 100 paper (Fig. 2). For irradiation, the filter paper (for h both sample and standard) and the detector were carefully stuck together.Personal monitor for uranium and thorium in uranium mine

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Direct determination of uranium and thorium in minerals by

Uranium and thorium oxides were provided by V. G. Khlopin Radium Institute (St. Petersburg, Russia). Samples and sample preparation One of the primary advantages of time-of-flight mass spectrometry with pulsed glow discharge ionisation in combined hollow cathode is its applicability for the analysis of both conducting and dielectric solids withIn the present study uranium and thorium were determined using DPASV and ICP-AES respectively in different size fractionated sediment samples collected from different locations across Thane Creek area, Mumbai, India. Mass balancing was carried out to get an idea about the distribution of uranium and thorium in different size fractions and Distribution of uranium and thorium in fractionated

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Uranium and thorium sequestration by a ScienceDirect

The mechanism and chemical nature of uranium and thorium sequestration by a Pseudomonas strain was investigated by transmission electron microscopy, energy dispersive X-ray (EDX) analysis, FTIR spectroscopy and X-ray diffractometry. Atomic force microscopy (AFM) used in the tapping mode elucidated the morphological changes in Volume occupancy of thorium and uranium in Th-52U alloy composition is ~0.4 and ~0.6 for uranium ( ρ = ~19.1 g cc −1) and thorium ( ρ = ~11.6 g cc −1 ), respectively. A rule-of-mixture estimate predicts the thermal conductivity to be ~32 W m −1 o C −1 against experimentally determined value of ~26 W m −1 o C −1.Determination of Room Temperature Thermal Conductivity of Thorium

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Development of separation procedures for determination of uranium

Two methods have been tested for separation of uranium and thorium from selenium using UTEVA and anion exchange resins. The average yield for separation of uranium, thorium and selenium was determined to be for the UTEVA method 91 ± 9%, 79 ± 8% and 96 ± 8%, respectively, and 96 ± 10%, 88 ± 9% and 94 ± 8%, respectively, in the

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