Relevant bibliographies by topics / Isotopic abundance

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Isotopic abundance'

Author: Grafiati
Published: 2 June 2025
Last updated: 31 July 2025

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Journal articles on the topic "Isotopic abundance"

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Burgess, Ray, Mitsuru Ebihara, and Hans Eggenkamp. "Developments in Halogen Abundance and Isotope Measurements." Elements 18, no. 1 (2022): 41–46. http://dx.doi.org/10.2138/gselements.18.1.41.

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The four stable halogens (F, Cl, Br, and I) are low-abundance elements that are widely distributed in nature. Two of the halogens, Cl and Br, each have two stable isotopes showing a range in natural isotope variation of up to a few parts per thousand. A variety of analytical techniques have been developed to determine the abundance and isotopic ratios of the halogens: these include in situ techniques for high spatial resolution studies and bulk determinations, and they have been applied to a range of materials, including whole rocks, minerals, glasses, and fluid inclusions. Here, we summarise
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Vanysek, V. "Isotopic Abundances in Comets." Symposium - International Astronomical Union 120 (1987): 461–67. http://dx.doi.org/10.1017/s0074180900154488.

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It is belived that the unprocessed material of the solar nebula may be preserved in comets. Thus the data concerning the chemical composition and the abundance of stable isotopes in these primitive bodies are of some importance in cosmological and cosmogonical context. Although the isotopic abundance in the small bodies of the Solar System are poorly known, owing to the forthcoming Halley fly-by missions, the discussion as whether or not the comets have preserved the cosmic isotopic ratio in their nuclei became more relevant. From this point of view expected data of the cosmologically and cosm
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Tea, Illa, Arnaud De Luca, Anne-Marie Schiphorst, et al. "Stable Isotope Abundance and Fractionation in Human Diseases." Metabolites 11, no. 6 (2021): 370. http://dx.doi.org/10.3390/metabo11060370.

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The natural abundance of heavy stable isotopes (13C, 15N, 18O, etc.) is now of considerable importance in many research fields, including human physiology. In fact, it varies between tissues and metabolites due to isotope effects in biological processes, that is, isotope discriminations between heavy and light isotopic forms during enzyme or transporter activity. The metabolic deregulation associated with many diseases leads to alterations in metabolic fluxes, resulting in changes in isotope abundance that can be identified easily with current isotope ratio technologies. In this review, we sum
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Meija, Juris. "Isotopic abundance challenge." Analytical and Bioanalytical Chemistry 391, no. 1 (2008): 1–2. http://dx.doi.org/10.1007/s00216-008-1981-4.

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Miljević, Nada, and Dušan Golobočanin. "Potential Use of Environmental Isotopes in Pollutant Migration Studies." Archives of Industrial Hygiene and Toxicology 58, no. 2 (2007): 251–62. http://dx.doi.org/10.2478/v10004-007-0015-5.

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Potential Use of Environmental Isotopes in Pollutant Migration StudiesThis article presents the use of natural abundance stable isotope (hydrogen, carbon, nitrogen, oxygen, chlorine) analysis data as a tool for providing important information about the origin of contaminants, the contribution of different sources to a multi-source plume, characterisation of their complex transport (rate and mechanisms) and for evaluating the success of contaminated site remediation. Isotopic signatures of contaminants are useful tracers of their sources, while isotopic fractionation can be used to quantitative
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Marti, Kurt, and K. J. Mathew. "Xenon in the Protoplanetary Disk (PPD), in Two Planets, and a Comet." Astrophysical Journal 940, no. 1 (2022): 14. http://dx.doi.org/10.3847/1538-4357/ac9904.

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Abstract Isotopic anomalies in several elements, as recently observed in meteorites, are generally interpreted to indicate nonequilibrium environments in the protoplanetary disk (PPD). Here we study reported Xe isotopic compositions on planets Earth and Mars, in a comet, and in meteorites for precursor discrepancies. Abundance variations of inferred presolar nano-diamonds, the carrier phase of the Xe-HL component, appear to be the primary source of nonuniformity of Xe precursors in the PPD, together with mechanisms of mass-dependent fractionation. While planet Mars kept a record of initial sol
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Kim, Seonho, Kwang Hyun Sung, and Kyujin Kwak. "Isotopic Compositions of Ruthenium Predicted from the NuGrid Project." Astrophysical Journal 924, no. 2 (2022): 88. http://dx.doi.org/10.3847/1538-4357/ac35e1.

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Abstract The isotopic compositions of ruthenium (Ru) are measured from presolar silicon carbide (SiC) grains. In a popular scenario, the presolar SiC grains formed in the outskirt of an asymptotic giant branch (AGB) star, left the star as a stellar wind, and joined the presolar molecular cloud from which the solar system formed. The Ru isotopes formed inside the star, moved to the stellar surface during the AGB phase, and were locked into the SiC grains. Following this scenario, we analyze the Nucleosynthesis Grid (NuGrid) data, which provide the abundances of the Ru isotopes in the stellar wi
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Collet, R., M. Asplund, and P. E. Nissen. "The Barium Isotopic Abundance in the Metal-Poor Star HD140283." Publications of the Astronomical Society of Australia 26, no. 3 (2009): 330–34. http://dx.doi.org/10.1071/as08057.

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AbstractWe derive the mixture of odd to even barium isotopes in the atmosphere of the metal-poor subgiant HD140283 from the analysis of the Ba ii transition at 4554 Å in a high-resolution high signal-to-noise spectrum of the star. The detailed shape of this spectral line depends on the relative contributions of odd and even isotopes via isotopic and hyperfine splitting. We measure the fractional abundance of odd Ba isotopes by modelling the formation of the Ba ii 4554-Å line profile with the use of both a classical 1D hydrostatic and a 3D hydrodynamical model atmosphere of HD140283. We interpr
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Coplen, Tyler B., John Karl Böhlke, P. De Bièvre, et al. "Isotope-abundance variations of selected elements (IUPAC Technical Report)." Pure and Applied Chemistry 74, no. 10 (2002): 1987–2017. http://dx.doi.org/10.1351/pac200274101987.

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Documented variations in the isotopic compositions of some chemical elements are responsible for expanded uncertainties in the standard atomic weights published by the Commission on Atomic Weights and Isotopic Abundances of the International Union of Pure and Applied Chemistry. This report summarizes reported variations in the isotopic compositions of 20 elements that are due to physical and chemical fractionation processes (not due to radioactive decay) and their effects on the standard atomic-weight uncertainties. For 11 of those elements (hydrogen, lithium, boron, carbon, nitrogen, oxygen,
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Coplen, Tyler B., and Yesha Shrestha. "Isotope-abundance variations and atomic weights of selected elements: 2016 (IUPAC Technical Report)." Pure and Applied Chemistry 88, no. 12 (2016): 1203–24. http://dx.doi.org/10.1515/pac-2016-0302.

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AbstractThere are 63 chemical elements that have two or more isotopes that are used to determine their standard atomic weights. The isotopic abundances and atomic weights of these elements can vary in normal materials due to physical and chemical fractionation processes (not due to radioactive decay). These variations are well known for 12 elements (hydrogen, lithium, boron, carbon, nitrogen, oxygen, magnesium, silicon, sulfur, chlorine, bromine, and thallium), and the standard atomic weight of each of these elements is given by IUPAC as an interval with lower and upper bounds. Graphical plots
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Dissertations / Theses on the topic "Isotopic abundance"

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Jezequel, Tangi. "Methodological developments for highly accurate quantitative ¹³C NMR : applied to isotopic analysis at natural abundance." Thesis, Nantes, 2018. http://www.theses.fr/2018NANT4058/document.

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L’analyse isotopique position-spécifique est une application de la RMN ¹³C quantitative qui permet de déterminer l’origine de molécules biologiques ou synthétiques grâce à la détermination de la distribution intramoléculaire du ¹³C au sein d’un composé organique. Jusqu’à présent, l’analyse ¹³C par PSIA nécessitait la combinaison de mesures par spectrométrie de masse de rapport isotopique avec des analyses par RMN ¹³C quantitative afin de déterminer les compositions isotopiques des différents carbones. Cependant, cette stratégie présente plusieurs inconvénients : (i) l’utilisation de deux techn
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Murray, Andrew P. "Factors controlling the abundance and carbon isotopic composition of land-plant derived compounds in crude oils." Thesis, Curtin University, 1998. http://hdl.handle.net/20.500.11937/1100.

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This thesis describes a study in petroleum geochemistry and specifically of the application of Land-plant derived hydrocarbons to elucidating source matter type, depositional environment and thermal maturity of crude oils. Large volumes of petroleum have been generated from land-plant organic matter in many parts of the world, but especially in the Tertiary deltaic provinces of the USA, Canada, Africa, Southeast Asia, Australia and New Zealand. Compared to oils from other regions, these oils have a relatively complex pattern of biomarkers or molecular fossils, a feature reflecting the diversit
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Leshin, Laurie Ann Stolper Edward M. Stolper Edward M. "The abundance and hydrogen isotopic composition of water in SNC meteorites : implications for water on Mars /." Diss., Pasadena, Calif. : California Institute of Technology, 1995. http://resolver.caltech.edu/CaltechETD:etd-11062007-091745.

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Murray, Andrew P. "Factors controlling the abundance and carbon isotopic composition of land-plant derived compounds in crude oils." Curtin University of Technology, Centre for Petroleum and Environmental Organic Geochemistry, 1998. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=10771.

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This thesis describes a study in petroleum geochemistry and specifically of the application of Land-plant derived hydrocarbons to elucidating source matter type, depositional environment and thermal maturity of crude oils. Large volumes of petroleum have been generated from land-plant organic matter in many parts of the world, but especially in the Tertiary deltaic provinces of the USA, Canada, Africa, Southeast Asia, Australia and New Zealand. Compared to oils from other regions, these oils have a relatively complex pattern of biomarkers or molecular fossils, a feature reflecting the diversit
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Green, Lisa Carol. "Fast atom bombardment mass spectra of pyrylium and pyridinium salts : the study of isotopic abundance ratios in various sputtering matrices." Thesis, Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/27441.

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Woolf, Vincent Martell. "Mercury elemental and isotopic abundances in mercury-manganese stars /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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Sands, Daphne G. "Lunar neutron energy spectra from isotope abundance measurements on cadmium, samarium and gadolinium." Thesis, Curtin University, 1998. http://hdl.handle.net/20.500.11937/803.

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This thesis provides new evidence which contributes to a clearer understanding of the mixing history of the lunar soil, the interactions of cosmic rays with the lunar surface and any temporal and spatial variations in cosmic ray intensity at the lunar surface. The bombardment of the lunar surface by cosmic rays produces secondary neutrons which are thermalised by the lunar soil. These thermal neutrons are captured by trace elements with large neutron capture cross sections such as cadmium, gadolinium and samarium. Measurements by thermal ionisation mass spectrometry of the changes in the isoto
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Szigeti, László, Szabolcs Mészáros, Verne V. Smith, et al. "12C/13C isotopic ratios in red-giant stars of the open cluster NGC 6791." OXFORD UNIV PRESS, 2018. http://hdl.handle.net/10150/627135.

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Carbon isotope ratios, along with carbon and nitrogen abundances, are derived in a sample of 11 red-giant members of one of the most metal-rich clusters in the Milky Way, NGC 6791. The selected red-giants have a mean metallicity and standard deviation of [Fe/H] = +0.39 +/- 0.06 (Cunha et al. 2015). We used high-resolution H-band spectra obtained by the SDSS-IV Apache Point Observatory Galactic Evolution Experiment. The advantage of using high-resolution spectra in the H band is that lines of CO are well represented and their line profiles are sensitive to the variation of C-12/C-13. Values of
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Szymanski, A. "Absolute gamma-ray abundances of light rhenium and tungsten isotopes." Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376142.

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Sands, Daphne G. "Lunar neutron energy spectra from isotope abundance measurements on cadmium, samarium and gadolinium." Curtin University of Technology, School of Physical Sciences, 1998. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=9486.

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This thesis provides new evidence which contributes to a clearer understanding of the mixing history of the lunar soil, the interactions of cosmic rays with the lunar surface and any temporal and spatial variations in cosmic ray intensity at the lunar surface. The bombardment of the lunar surface by cosmic rays produces secondary neutrons which are thermalised by the lunar soil. These thermal neutrons are captured by trace elements with large neutron capture cross sections such as cadmium, gadolinium and samarium. Measurements by thermal ionisation mass spectrometry of the changes in the isoto
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Books on the topic "Isotopic abundance"

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Stephen, Carpenter B., and United States. National Bureau of Standards., eds. Uranium-235 isotope abundance standard reference materials for gamma spectrometry measurements. U.S. Dept. of Commerce, National Bureau of Standards, 1986.

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Stephen, Carpenter B., and United States. National Bureau of Standards, eds. Uranium-235 isotope abundance standard reference materials for gamma spectrometry measurements. U.S. Dept. of Commerce, National Bureau of Standards, 1986.

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Stephen, Carpenter B., and United States. National Bureau of Standards., eds. Uranium-235 isotope abundance standard reference materials for gamma spectrometry measurements. U.S. Dept. of Commerce, National Bureau of Standards, 1986.

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Stephen, Carpenter B., and United States. National Bureau of Standards., eds. Uranium-235 isotope abundance standard reference materials for gamma spectrometry measurements. U.S. Dept. of Commerce, National Bureau of Standards, 1986.

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Stephen, Carpenter B., and United States. National Bureau of Standards, eds. Uranium-235 isotope abundance standard reference materials for gamma spectrometry measurements. U.S. Dept. of Commerce, National Bureau of Standards, 1986.

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Stephen, Carpenter B., and United States. National Bureau of Standards., eds. Uranium-235 isotope abundance standard reference materials for gamma spectrometry measurements. U.S. Dept. of Commerce, National Bureau of Standards, 1986.

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Puig, Alvaro. The geological and metallogenic significance of lead isotope abundance studies on galena occurrences in the Chilean Andes. Oxford Polytechnic, 1985.

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G, Walthall Frank, Philpotts John A, and Geological Survey (U.S.), eds. Abundances of Li, Rb, and Sr in W-2, BCR-1, and AC-E determined by isotope dilution mass spectroscopy. U.S. Dept. of the Interior, Geological Survey, 1993.

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R, Somma, and Geological Survey (U.S.), eds. Pb isotopes and toxic metal abundances in the floodplain and stream sediments from the Volturno River Basin (Campania, Italy): Natural and anthropogenic contributions. U.S. Dept. of the Interior, U.S. Geological Survey, 1999.

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Ellam, Rob. 4. Measuring isotopes. Oxford University Press, 2016. http://dx.doi.org/10.1093/actrade/9780198723622.003.0004.

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‘Measuring isotopes: counting the atoms’ explores how isotopes are measured. For stable isotopes, atoms of each isotope are counted using a mass spectrometer. This turns atoms into charged ions and separates them into the different isotopic species using a mass filter. Precise measurements of isotopic abundance can be achieved in a few minutes or hours. Mass spectrometry could be used for radioactive isotopes, but for short-lived isotopes, their low abundance often makes them difficult to detect. The alternative is to use nuclear spectroscopy or counting methods to detect the characteristic en
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Book chapters on the topic "Isotopic abundance"

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Wille, P., and R. Jede. "Isotopic Abundance in Natural Iron." In Proceedings of the Seventh ASTM-Euratom Symposium on Reactor Dosimetry. Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2781-3_47.

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Kagawa, Akira, and Giovanna Battipaglia. "Post-photosynthetic Carbon, Oxygen and Hydrogen Isotope Signal Transfer to Tree Rings—How Timing of Cell Formations and Turnover of Stored Carbohydrates Affect Intra-annual Isotope Variations." In Stable Isotopes in Tree Rings. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92698-4_15.

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AbstractIn this chapter, we discuss post-photosynthetic processes that affect intra-annual variation in the stable isotopes of tree rings, such as timing of cell formations and turnover of stored carbohydrates, by combining research findings gained by using either natural-abundance or artificially-enriched carbon, oxygenand hydrogen isotopes. We focus on within-ring variation in stable isotope ratios, with an emphasis on aligning observed ratios in whole wood or extracted cellulose to seasonal dynamics in climate and phenology. We also present a discussion of isotopic fractionation that operat
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Kagawa, Akira, and Giovanna Battipaglia. "Post-photosynthetic Carbon, Oxygen and Hydrogen Isotope Signal Transfer to Tree Rings—How Timing of Cell Formations and Turnover of Stored Carbohydrates Affect Intra-annual Isotope Variations." In Stable Isotopes in Tree Rings. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92698-4_15.

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AbstractIn this chapter, we discuss post-photosynthetic processes that affect intra-annual variation in the stable isotopes of tree rings, such as timing of cell formations and turnover of stored carbohydrates, by combining research findings gained by using either natural-abundance or artificially-enriched carbon, oxygenand hydrogen isotopes. We focus on within-ring variation in stable isotope ratios, with an emphasis on aligning observed ratios in whole wood or extracted cellulose to seasonal dynamics in climate and phenology. We also present a discussion of isotopic fractionation that operat
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Sénécaut, Nicolas, Pierre Poulain, Laurent Lignières, et al. "Quantitative Proteomics in Yeast: From bSLIM and Proteome Discoverer Outputs to Graphical Assessment of the Significance of Protein Quantification Scores." In Methods in Molecular Biology. Springer US, 2022. http://dx.doi.org/10.1007/978-1-0716-2257-5_16.

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AbstractSimple light isotope metabolic labeling (bSLIM) is an innovative method to accurately quantify differences in protein abundance at the proteome level in standard bottom-up experiments. The quantification process requires computation of the ratio of intensity of several isotopologs in the isotopic cluster of every identified peptide. Thus, appropriate bioinformatic workflows are required to extract the signals from the instrument files and calculate the required ratio to infer peptide/protein abundance. In a previous study (Sénécaut et al., J Proteome Res 20:1476–1487, 2021), we develop
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Werner, Roland A., and Marc-André Cormier. "Isotopes—Terminology, Definitions and Properties." In Stable Isotopes in Tree Rings. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92698-4_8.

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AbstractThe intention of this chapter is to give insight into the properties and peculiarities of the stable isotopes of the bioelements. Following an overview about the terminology and ʻtechnical jargonʼ used in stable isotope sciences, methods to calculate and express isotopic abundances are presented. Subsequently, a short description of the physicochemical basis of equilibrium and kinetic (mass-dependent) isotope effects (EIEs and KIEs) as origin of isotope fractionation in chemical and biological systems is given. Further, measures for calculation and presentation of isotope fractionation
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Okano, J., and H. Nishimura. "Ion Microprobe Studies of the Magnesium Isotopic Abundance in Allende and Antarctic Meteorites." In Springer Series in Chemical Physics. Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82724-2_120.

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Zaman, M., K. Kleineidam, L. Bakken, et al. "Isotopic Techniques to Measure N2O, N2 and Their Sources." In Measuring Emission of Agricultural Greenhouse Gases and Developing Mitigation Options using Nuclear and Related Techniques. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-55396-8_7.

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AbstractGHGemissions are usually the result of several simultaneous processes. Furthermore, some gases such as N2 are very difficult to quantify and require special techniques. Therefore, in this chapter, the focus is on stable isotopemethods. Both natural abundance techniques and enrichment techniques are used. Especially in the last decade, a number of methodological advances have been made. Thus, this chapter provides an overview and description of a number of current state-of-the-art techniques, especially techniques using the stable isotope15N. Basic principles and recent advances of the
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Huston, David L., Robert B. Trumbull, Georges Beaudoin, and Trevor Ireland. "Light Stable Isotopes (H, B, C, O and S) in Ore Studies—Methods, Theory, Applications and Uncertainties." In Isotopes in Economic Geology, Metallogenesis and Exploration. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-27897-6_8.

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AbstractVariations in the abundances of light stable isotopes, particularly those of hydrogen, boron, carbon, oxygen and sulfur, were essential in developing mineralization models. The data provide constraints on sources of hydrothermal fluids, carbon, boron and sulfur, track interaction of these fluids with the rocks at both the deposit and district scales, and establish processes of ore deposition. In providing such constraints, isotopic data have been integral in developing genetic models for porphyry-epithermal, volcanic-hosted massive sulfide, orogenic gold, sediment-hosted base metal and
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Bärs, B., and T. Serén. "Measurement of the Isotopic Abundance Of 54Fe in Natural Iron by Means of Neutron Activation." In Proceedings of the Seventh ASTM-Euratom Symposium on Reactor Dosimetry. Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2781-3_42.

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Kratz, K. L., W. Hillebrandt, J. Krumlinde, et al. "A Possible Unified Interpretation of the Solar 48Ca/46Ca Abundance Ratio and Ca-Ti Isotopic Anomalies in Meteorites." In Nucleosynthesis and Its Implications on Nuclear and Particle Physics. Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4578-4_43.

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Conference papers on the topic "Isotopic abundance"

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Sullivan, Dan, Ariel Anbar, Wang Zheng, and Brandon Hasty. "Examining Mercury Abundance and Isotopic Fractionation During Chemical Weathering of Organic-Rich Shales." In Goldschmidt2022. European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.12817.

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Shaw, R. W., C. M. Barshick, J. P. Young, and J. M. Ramsey. "Diode Laser Optogalvanic Spectroscopy for Uranium Isotopic Analysis: Analytical Figures of Merit." In Laser Applications to Chemical and Environmental Analysis. Optica Publishing Group, 1996. http://dx.doi.org/10.1364/lacea.1996.lwa.3.

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High resolution optogalvanic spectroscopy, excited using near-infrared semiconductor diode lasers, has been utilized for the determination of 235⋃/238⋃ isotopic ratios for uranium and uranium compounds.1,2 The samples ranged from depleted (0.27%) to enriched (20%) 235⋃ abundance. The goal of this effort has been to develop a technique that is suitable for use in the field for measurements at moderate precision. Glow discharge sampling can be conveniently accomplished in such settings, and diode lasers are sufficiently rugged and simple for incorporation into routine instruments. The concept of
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Xie, Jinsen, and Tao Yu. "Analysis of Isotopic Contributions to Doppler Coefficients of Inert Matrix Fuels." In 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-30620.

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The Minor Actinides (MA) generated by nowadays PWRs fleet has significant impact on environment and biosphere. Inert Matrix Fuels (IMF) is a possible way to reduce the production and hazard of MA in recent. From neutronic aspect, using the MCNP code with temperature related continuous neutron data, the present paper analyses the isotopic contributions to the Doppler Coefficients of certain types IMF fuels. It is concluded that, the Doppler Coefficients of Al2O3+ZrO2+MgO and ZrO2 based IMF fuels are much smaller than those containing ThO2, since the low neutron absorptions and lacking of resona
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Schaefer, Bruce, Peter Wieland, Rachel Bezard, and Simon Turner. "High Precision N-TIMS Os Isotopic Measurement on Low Abundance Materials Using 10 13 ohm Resistors." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.2295.

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Xia, Tian. "Exposure dating with 41Ca analysis at the 10-16 isotopic abundance level." In Goldschmidt2022. European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.11031.

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Khalifa, Aqeel, Paul Tarabbia, Mohammad A. Alrowaie, and Mohamed Soua. "Significance and Implications of Diagenetic Nodular Anhydrite on Sandstone Reservoirs Quality." In SPE Annual Technical Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210403-ms.

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Abstract Diagenetic nodular anhydrite observed in fluvio-aeolian-lacustrine and glacial sandstones has significant implications to reservoir quality. This type of nodular cement is spatially and volumetrically variable within these reservoirs. Its presence impacts subsurface formation evaluation and porosity calculations. Thus, the investigation of these nodules was carried out using: core image analysis; thin sections petrography; micro computed tomography (MicroCT) scans; bulk rock X-Ray Diffraction (XRD); sulfur & strontium isotope analyses. Where core was unavailable, geochemical data
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Choi, Sung Hi, Samuel Mukasa, John W. Shervais, and Igor S. Puchtel. "PGE ABUNDANCE AND Re-Os ISOTOPIC SYSTEMATICS OF COAST RANGE OPHIOLITE PERIDOTITES AND CHROMITITE, AND INSIGHTS INTO FORE-ARC MAGMATIC PROCESSES." In 121st Annual Meeting of the GSA Cordilleran Section - 2025. Geological Society of America, 2025. https://doi.org/10.1130/abs/2025cd-409424.

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Abd El Gawad, K., and Yushou Song. "Uranium Enrichment Measurement Using Enrichment-Meter Approach." In 2018 26th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icone26-82101.

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The 235U enrichment is one of the most important characteristics of nuclear materials for nuclear safeguards purposes. The multi-group γ-ray analysis method for uranium (MGAU) is an important non-destructive gamma spectroscopy method for 235U enrichment determination. Using that method, the typical measurement bias is below 3% for uranium material with abundance from 0.3 to 93 %. However, it is not applicable for the samples with thick container or without isotopic decay equilibrium. In this work, the enrichment meter method was studied with two uranium dioxide samples (235U abundance 0.71 % a
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Li, Sufen, Suizheng Qiu, Quanhu Zhang, Yonggang Huo, and Limin Liu. "Fast Neutron Multiplicity Simulation of Nuclear Material Based on Geant4." In 2016 24th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/icone24-61015.

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Fast neutron multiplicity counting (FNMC) analysis method is a new nondestructive method for nuclear materials, which defines sample plutonium quality by the fast neutron detection array with multiplicity counting technique. Referring to the most advanced FNMC experimental device, fast neutron multiplicity counter model was constructed in this paper. A series of typical plutonium material sample models were designed, which includes the plutonium metal with different isotopic abundance and different quality and the plutonium oxide. The correctness of the equations and the necessity to amend the
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Mewaldt, R. A. "The abundances of isotopes in the cosmic radiation." In Cosmic abundances of matter. AIP, 1989. http://dx.doi.org/10.1063/1.38009.

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Reports on the topic "Isotopic abundance"

1

Holden, N. E. Literature survey of isotopic abundance data for 1991--1993. Office of Scientific and Technical Information (OSTI), 1993. http://dx.doi.org/10.2172/10102557.

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Hayes, John. An Introduction to Isotopic Calculations. Woods Hole Oceanographic Insitution, 2004. http://dx.doi.org/10.1575/1912/27058.

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Friar, R. J., and T. E. Sampson. Plutonium isotopic abundance measurements on CBNM NRM 271 analyzed with the FRAM and MGA codes. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/10140268.

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Stevens, C. M., Sepanski, and L. J. Morris. Carbon-13 isotopic abundance and concentration of atmospheric methane for background air in the Southern and Northern Hemispheres from 1978 to 1989. Office of Scientific and Technical Information (OSTI), 1995. http://dx.doi.org/10.2172/72735.

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Piper, Stephen, and Ralph Keeling. Study of the Role of Terrestrial Processes in the Carbon Cycle Based on Measurements of the Abundance and Isotopic Composition of Atmospheric CO2. Office of Scientific and Technical Information (OSTI), 2012. http://dx.doi.org/10.2172/1032487.

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Keeling, Ralph. Developing Model Constraints on Northern Extra-Tropical Carbon Cycling Based on measurements of the Abundance and Isotopic Composition of Atmospheric CO2. Office of Scientific and Technical Information (OSTI), 2014. http://dx.doi.org/10.2172/1165340.

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Reid, M. S., X. Wang, N. Utting, and C. Jiang. Comparison of water chemistry of hydraulic-fracturing flowback water from two geological locations at the Duvernay Formation, Alberta, Canada. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/329276.

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We analyzed and compared the water chemistry between 17 Fox Creek region samples, each from a different well, and 23 Three Hills region samples from a single well. Overall, the two regions were similar in chemical composition but showed small differences in some lower abundance dissolved elements. Additionally, we investigated changes in water chemistry of FPW over time from a single well. The majority of water quality parameters and water chemistry remained constant over the 7-month sampling time. Major ion chemistry showed increasing concentrations of Ca and Mg, and a decreasing concentratio
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Parker, W. E., and J. M. Hall. Isotopic Abundances and Ratios in Arsenic Irradiated by High-Energy Neutrons. Office of Scientific and Technical Information (OSTI), 2010. http://dx.doi.org/10.2172/1116904.

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Wimpenny, J., and G. Brennecka. Characterization of actinide abundances and isotopic compositions by HR-ICP-MS. Office of Scientific and Technical Information (OSTI), 2022. http://dx.doi.org/10.2172/1844487.

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Matte, S., M. Constantin, and R. Stevenson. Mineralogical and geochemical characterisation of the Kipawa syenite complex, Quebec: implications for rare-earth element deposits. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/329212.

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The Kipawa rare-earth element (REE) deposit is located in the Parautochton zone of the Grenville Province 55 km south of the boundary with the Superior Province. The deposit is part of the Kipawa syenite complex of peralkaline syenites, gneisses, and amphibolites that are intercalated with calc-silicate rocks and marbles overlain by a peralkaline gneissic granite. The REE deposit is principally composed of eudialyte, mosandrite and britholite, and less abundant minerals such as xenotime, monazite or euxenite. The Kipawa Complex outcrops as a series of thin, folded sheet imbricates located betw
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