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High Precision Isotope Analysis Of Uranium And Thorium By Tims
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Book Synopsis High-Precision Isotope Analysis Of Uranium And Thorium By Tims by : L. A. Neymark
Download or read book High-Precision Isotope Analysis Of Uranium And Thorium By Tims written by L. A. Neymark and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The U.S. Geological Survey (USGS) Yucca Mountain Project Branch laboratory in Denver, Colorado, conducts routine high-precision isotope analyses of uranium (U) and thorium (Th) using thermal ionization mass-spectrometry (TIMS). The measurements are conducted by a solid-source mass-spectrometer equipped with a Faraday multi-collector system and an energy filter in front of an active-film-type secondary electron multiplier (SEM). The abundance sensitivity of the instrument (signal at mass 237 over {sup 238}U in natural U) with the energy filter is {approx} 15 x 10{sup -9} and peak tails are reduced by a factor of {approx}100 relative to the Faraday cup measurements. Since instrument installation in April 2004, more than 500 rock and water samples have been analyzed in support of isotope-geochemical studies for the U.S. Department of Energy's Yucca Mountain Project. Isotope ratios of sub-nanogram to microgram U and Th samples are measured on graphite-coated single-filament and double-filament assemblies using zone-refined rhenium filaments. Ion beams less than 5 millivolt (mV) are measured with the SEM, which is corrected for non-linearity on the basis of measurements of National Institute of Standards and Technology (NIST) U-500 and 4321 B standards with ion beams ranging from 0.01 to 8 mV. Inter-calibration between the SEM and the Faraday multi-collector is performed for every mass cycle using a {approx}5 mV beam switched between Faraday cup and SEM ('bridging' technique), because SEM-Faraday inter-calibrations prior to the measurement failed to produce acceptable results. Either natural ({sup 235}U) or artificial ({sup 236}U, {sup 229}Th) isotopes were used for the bridging. Separate runs are conducted for minor isotopes using SEM only. These techniques result in high within-run precisions of
Book Synopsis The Determination of Uranium and Thorium Isotopes in Water, Rock, and Soil Samples by Alpha Spectrometry by : Stephen Donivan
Download or read book The Determination of Uranium and Thorium Isotopes in Water, Rock, and Soil Samples by Alpha Spectrometry written by Stephen Donivan and published by . This book was released on 1982 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Isotopic Analysis of Uranium in Natural Waters by Alpha Spectrometry by : Kenneth W. Edwards
Download or read book Isotopic Analysis of Uranium in Natural Waters by Alpha Spectrometry written by Kenneth W. Edwards and published by . This book was released on 1968 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High Precisin and High Accuracy Isotopic Measurement of Uranium Using Lead and Thorium Calibration Solutions by Inductively Coupled Plasma-Multiple Collector-Mass Spectrometry by : I. Bowen
Download or read book High Precisin and High Accuracy Isotopic Measurement of Uranium Using Lead and Thorium Calibration Solutions by Inductively Coupled Plasma-Multiple Collector-Mass Spectrometry written by I. Bowen and published by . This book was released on 1998 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: A novel method for the high accuracy and high precision measurement of uranium isotopic composition by Inductively Coupled Plasma-Multiple Collector-Mass Spectrometry is discussed. Uranium isotopic samples are spiked with either thorium or lead for use as internal calibration reference materials. This method eliminates the necessity to periodically measure uranium standards to correct for changing mass bias when samples are measured over long time periods. This technique has generated among the highest levels of analytical precision on both the major and minor isotopes of uranium. Sample throughput has also been demonstrated to exceed Thermal Ionization Mass Spectrometry by a factor of four to five.
Book Synopsis Catalog of Uranium, Thorium, and Plutonium Isotopes by : B. Harmatz
Download or read book Catalog of Uranium, Thorium, and Plutonium Isotopes written by B. Harmatz and published by . This book was released on 1954 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Uranium Isotopic Standard Reference Materials by : E. L. Garner
Download or read book Uranium Isotopic Standard Reference Materials written by E. L. Garner and published by . This book was released on 1971 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High Precision Isotopic Analyses of Uranium and Plutonium by Total Sample Volatilization and Signal Integration by :
Download or read book High Precision Isotopic Analyses of Uranium and Plutonium by Total Sample Volatilization and Signal Integration written by and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Techniques have been developed which permit rapid, high-precision analyses of uranium and plutonium by multiple-filament thermal ionization mass spectrometry utilizing a commercial multicollector instrument. The salient feature of the method is volatilization of the entire sample while simultaneously integrating the signal from each isotope, thus virtually eliminating the effects of isotope fractionation in the evaporation process. The method permits the analysis of samples much smaller than required for conventional techniques using Faraday collectors and is expected to have application in the analysis of many elements in addition to uranium and plutonium. Run-to-run reproducibilities of
Book Synopsis Determination of Uranium Isotopes in Irradiated Thorium by : Robert S. Ondrejcin
Download or read book Determination of Uranium Isotopes in Irradiated Thorium written by Robert S. Ondrejcin and published by . This book was released on 1964 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Precise Isotope Ratio Measurements for Uranium, Thorium and Plutonium by Quadrupole-based Inductively Coupled Plasma Mass Spectrometry by : J. S. Becker
Download or read book Precise Isotope Ratio Measurements for Uranium, Thorium and Plutonium by Quadrupole-based Inductively Coupled Plasma Mass Spectrometry written by J. S. Becker and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Summary of Current U. S. Geological Survey Chemical Methods of Uranium and Thorium Analysis by : F. S. Grimaldi
Download or read book Summary of Current U. S. Geological Survey Chemical Methods of Uranium and Thorium Analysis written by F. S. Grimaldi and published by . This book was released on 1951 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High-precision isotope ratio measurements of uranium and plutonium in the environment by : Thorsten Warneke
Download or read book High-precision isotope ratio measurements of uranium and plutonium in the environment written by Thorsten Warneke and published by . This book was released on 2002 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Analytical Chemistry of Thorium by : D. I. Ryabchikov
Download or read book The Analytical Chemistry of Thorium written by D. I. Ryabchikov and published by Elsevier. This book was released on 2013-10-22 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: International Series of Monographs on Analytical Chemistry, Volume 10: The Analytical Chemistry of Thorium focuses on the composition, properties, and reactions of thorium. The book first discusses the occurrence of thorium and its properties. Topics include the position of thorium in the periodic system; methods of preparation for metallic thorium; and radioactivity of thorium isotopes. The text surveys the chemical and physical methods in identifying thorium. Gravimetric and fluorescence methods; detection and estimation of thorium by spectroscopic and X-ray analysis; and colorimetric and spectrophotometric methods are discussed. The text also examines the methods of separating thorium from associated elements. The separation of thorium from rare earths, scandium, titanium, uranium, lead, alkali metals, gallium, and beryllium is underscored. The text also discusses the determination of thorium in natural and industrial materials. Regeneration of thorium from industrial waste; isolation of thorium from ores and minerals; and analysis of alloys containing thorium are explained. The book is a valuable source of data for students and chemists wanting to study thorium.
Book Synopsis Determination of Total and Isotopic Uranium and Total Thorium in Soils by Inductively Coupled Plasma-Mass Spectrometry by : RN. Bolin
Download or read book Determination of Total and Isotopic Uranium and Total Thorium in Soils by Inductively Coupled Plasma-Mass Spectrometry written by RN. Bolin and published by . This book was released on 1995 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inductively coupled plasma-mass spectrometry (ICP-MS), using standard sample introduction by peristaltic pumping, is presented as a method to determine total and isotopic uranium (234U, 235U, 236U, and 238U) and thorium (232Th) in soil samples. Initial sample preparation consists of oven drying to determine moisture content, and grinding and mixing the soil to make it homogenous. This is followed by a nitric/hydrofluoric acid digestion to bring the uranium into solution. Bismuth (209Bi) is added prior to digestion to monitor for losses due to sample preparation and analysis. An additional digestion, using nitric/perchloric acid is performed if the total thorium concentration is required on the sample. The uranium and thorium content of this solution and the 235U/238U ratio are measured on an initial pass through the ICP-MS. The total uranium measurement is based on the 238U isotope measurement with correction for the presence of the U isotopes. To determine the concentration of the less abundant 234U and 236U isotopes, the digestate is further concentrated by using a solid phase extraction column (TRUSpec by EiChrom Industries, Inc.) before a second pass through the ICP-MS.
Book Synopsis NOTES ON THE ISOTOPE ANALYSIS OF URANIUM WITH THE HYPEAC AND THE AUTOMATIC ELECTRONIC INTEGRATOR. by :
Download or read book NOTES ON THE ISOTOPE ANALYSIS OF URANIUM WITH THE HYPEAC AND THE AUTOMATIC ELECTRONIC INTEGRATOR. written by and published by . This book was released on 1965 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Uranium-thorium-lead Isotope Ratios as an Aid to Mineral Exploration by : S. H. U. Bowie
Download or read book Uranium-thorium-lead Isotope Ratios as an Aid to Mineral Exploration written by S. H. U. Bowie and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Standard Test Method for Analysis of Total and Isotopic Uranium and Total Thorium in Soils by Inductively Coupled Plasma-Mass Spectrometry Withdrawn 2015 by :
Download or read book Standard Test Method for Analysis of Total and Isotopic Uranium and Total Thorium in Soils by Inductively Coupled Plasma-Mass Spectrometry Withdrawn 2015 written by and published by . This book was released on with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Polyatomic Interferences on High Precision Uranium Isotope Ratio Measurements by MC-ICP-MS by :
Download or read book Polyatomic Interferences on High Precision Uranium Isotope Ratio Measurements by MC-ICP-MS written by and published by . This book was released on 2015 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern mass spectrometry and separation techniques have made measurement of major uranium isotope ratios a routine task; however accurate and precise measurement of the minor uranium isotopes remains a challenge as sample size decreases. One particular challenge is the presence of isobaric interferences and their impact on the accuracy of minor isotope 234U and 236U measurements. Furthermore, we present techniques used for routine U isotopic analysis of environmental nuclear safeguards samples and evaluate polyatomic interferences that negatively impact accuracy as well as methods to mitigate their impacts.
