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Wednesday, August 5, 2020 | History

2 edition of Coprecipitation of radionuclides found in the catalog.

Coprecipitation of radionuclides

Enzo Curti

Coprecipitation of radionuclides

basic concepts, literature review and first applications

by Enzo Curti

  • 138 Want to read
  • 14 Currently reading

Published by Nagra, National Cooperative for the Disposal of Radioactive Waste in Wettingen .
Written in English

    Subjects:
  • Precipitation (Chemistry),
  • Radioactive waste disposal.,
  • Radioisotopes in geology.

  • Edition Notes

    StatementEnzo Curti.
    SeriesTechnical report / Nagra -- 97-08, Technischer Bericht NTB -- 97-08.
    ContributionsNationale Genossenschaft für die Lagerung Radioaktiver Abfälle (Switzerland)
    Classifications
    LC ClassificationsTD898.14.G46 C86 1997
    The Physical Object
    Paginationviii, 107 p. :
    Number of Pages107
    ID Numbers
    Open LibraryOL18439297M

      Coprecipitation of trace metals by DNA and RNA molecules. Analytical Chemistry , 62 (5), DOI: /aca Oliver C. Mullins. Asphaltenes in crude oil: absorbers and/or scatterers in the near-infrared region?. Chapter 1 Radionuclides and their Radiometric Measurement (pages 1–24): Chapter 2 Special Features of the Chemistry of Radionuclides and their Separation (pages 25–34): Chapter 3 Factors Affecting Chemical Forms of Radionuclides in Aqueous Solutions .

      Different techniques of water treatment. Water treatment technologies for removal of natural radionuclides (radium) have been developed at first for the uranium mining and milling industry (Nixon et al. ).This problem is well known since for many years, it was a very important issue to diminish the environmental pollution caused by the uranium industry. The radionuclides are separated from each other and from interfering elements by solvent extraction with HDEHP (diethylhexyl)phosphoric acid) in n-heptane. {Isolation of strontium, yttrium, promethium, and cerium from wet ashed urine by calcium oxalate coprecipitation and sequential solvent extraction}, author = {Kramer.

      Nuclear energy is the one energy source that could meet the world's growing energy needs and provide a smooth transition from fossil fuels to renewable energy in the coming decades and centuries. It is becoming abundantly clear that an increase in nuclear energy capacity will, and probably must, take place. However, nuclear energy and the use of radionuclides for civilian and military . Relative Humidity History Affects Hygroscopicity of Mixed Particles of Glyoxal and Reduced Nitrogenous Species; Facile interconversion of duplex structures formed by copolymers of d(CG).


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EOS AQUA AMSR-E SEA ICE VALIDATION PROGRAM: MELTPOND 2000 FLIGHT REPORT... NASA/TM-2000-209972... MAR. 8, 2002.

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Coprecipitation of radionuclides by Enzo Curti Download PDF EPUB FB2

Coprecipitation. Coprecipitation is a very facile and convenient way to synthesize iron oxide nanoparticles (either Fe3O4 or γ-Fe2O3) from aqueous Fe2+/Fe3+ salt solutions by the addition of a base under inert atmosphere at room temperature or at elevated temperature.

From: Nanomaterials for Wastewater Remediation, Related terms: Iron Oxide. 58 rows  Coprecipitation technique is a facile and effective approach for the preparation of iron.

Adsorption of radionuclides on reduced graphene oxide-based composites The GO-based inverse spinel nickel ferrite (GONF) and rGO-based inverse spinel nickel ferrite (rGONF) nanocomposite were prepared by coprecipitation of GO with nickel and iron salts in one pot, and this was used to remove U(VI) and Th(IV) [].

Coprecipitation of radionuclides: Basic concepts, literature review and first applications Book January with 1, Reads How we measure 'reads'Author: Enzo Curti. Coprecipitation is the simultaneous precipitation of more substances from a solution. Heterogeneous catalysts containing two or more components can be prepared by coprecipitation.

The coprecipitation method is often preferred to other processes because it involves simple steps and the composition is easy to control [21,25]. Coprecipitation of radionuclides: basic concepts, literature review and first applications.

PSI-ReportPaul Scherrer Institut, Villigen, Switzerland. Also published as Nagra Technical Report NTB by the National Cooperative for the Disposal. Coprecipitation of radionuclides book of radionuclides with secondary solids is currently neglected in safety assessments for radioactive waste repositories, although this.

Foam separation of Cs + radionuclides coprecipitated with cadmium(II) hexacyanoferrate ( Cs-CdHCF) particles is investigated in this study using two types of surfactants. The effects of several coprecipitation and foam separation parameters on the recovery percentage and volume reduction of cesium radionuclides are evaluated.

Coprecipitation in carbonate minerals offers a means of slowing the transport of divalent radionuclides and contaminant metals (e.g., 90 Sr 2+, UO 2+, Co 2+) in the may be possible to accelerate this process by stimulating the native microbial community to generate chemical conditions favoring carbonate precipitation.

limits for some radionuclides in Parts (c) (1) and (2). These are shown in Table 2. It is important to note that the list of radionuclides for which detection limits are specified in Part (c) does not exactly match the list of radionuclides for which maximum contaminant levels are. The present book represents a state-of-the-art review and evaluation of the type and magnitude of the various sorption and incorporation processes in hydrated cement systems for twenty-five elements.

Source and Generation of Radionuclides 52 Appendix: Reagents Used to Adjust Oxidation States of Radionuclides 54 Oxidants 54 Reductants 55 4 Separation Methods 57 Precipitation 57 Solubility Product 58 Coprecipitation 59 Objectives of Precipitation 60 Precipitations Specific for the Investigated.

Due to the structural complexity and chemical variability of smectites, sorption of radionuclides involves several sorption mechanisms: (1) adsorption via inner-sphere and outer-sphere complexation; (2) cation exchange in the interlayer; and (3) incorporation into the smectite structure.

radionuclides from their ores, processes related to nuclear power plants and the manufacture of atomic weapons, and use of radionuclides in medical diagnosis and treatment techniques. Iodine x coprecipitation (α) was found to be 99% for Ci/g Affects thyroid Europium x.

The K d values for Tc and I in Table Table1 1 are based on the assumption that pertechnetate (TcO 4-) and iodide (I-) are the dominant species in groundwater and during experimental measurements [].However, these and several of the other radionuclides listed in Table Table1 1 (i.e., Tc, I, Np, U, and Pu) are redox-sensitive, and the speciation and retardation of these radionuclides is.

A radionuclide (radioactive nuclide, radioisotope or radioactive isotope) is an atom that has excess nuclear energy, making it unstable. This excess energy can be used in one of three ways: emitted from the nucleus as gamma radiation; transferred to one of its electrons to release it as a conversion electron; or used to create and emit a new particle (alpha particle or beta particle) from the.

Alpha-emitting radionuclides. Analysis of produced fluids for alpha-particle emitting radionuclides in the U and Th decay series ( Po, Th, Th, U, U, U) was conducted by preconcentration and isotope dilution alpha spectrometry.

All results presented are from an unfiltered subsample (20 L, in a polypropylene carboy. During the formation of biological carbonate mineralization, coprecipitation of radionuclides is another process for retarding migration of actinides and Sr. Unicellular fungus yeast Saccharomyces cerevisiae accumulated radioactive Cs inside cells.

Therefore, microorganisms play an important role for the migration of radionuclides including. Journal Article: The coprecipitation of Pu and other radionuclides with CaCO[sub 3]. In particular, it is necessary to study the laws of precipitation and coprecipitation of radionuclides in order to be able to predict how they spread in ecological chains, which is important for environment protection and public health services.

Remediation of radionuclide-contaminated land by carbonates has attracted increasing attention. The high stability of carbonates and the potential for coprecipitation of radionuclides is an appealing engineer application (Lauchnor et al., ).

90 Sr, a uranium fission by-product, is readily coprecipitated with CaCO 3 (Curti, ).radionuclides. In general, an actinide metal ion will coprecipitate if the anion contained in the bulk precipitate forms an insoluble salt with the actinide metal ion in the same oxidation state or states present in the solution.

Coprecipitation methods have been used to purify plutonium in microgram amounts and for recovery on a production scale.This chapter describes the behavior of selected natural radionuclides in the environment, the sources and variability of natural radiation, and the doses received by humans.

Its purpose is to provide background information for discussions of the mechanisms by which exposures to natural sources can be increased by technologic activities, that is, can become exposures to TENORM. A more detailed.