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Cyclic voltammetric study of the reduction of U(III) to uranium metal in molten LiCl-NaCl-CaCl/sub 2/-BaCl/sub 2/-UCl/sub 3/

Description: Cyclic voltammetry was used to investigate the electrochemistry of the reduction of UCl/sub 3/ to uranium metal in molten LiCl-NaCl-CaCl/sub 2/-BaCl/sub 2/ (49.7-8.0-26.5-15.8 mol %) containing dissolved UCl/sub 3/. The purpose of the study was to obtain information on the kinetics of the reaction, which will be used in the design of electrorefining equipment for the reprocessing of core and blanket fuel discharged from the Integral Fast Reactor (IFR). The electrorefining operation employs the … more
Date: January 1, 1986
Creator: Poa, D.S.; Tomczuk, Z. & Steunenberg, R.K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Bremsstrahlung-Induced K Fluorescence

Description: Bremsstrahlung radiation can be used to excite nearly monoenergetic x rays in secondary targets, which are then used to study the energy response of radiation detectors if the intensity and purity are known. A method is suggested for calculating the spectral intensity of the secondary target radiation, including K-fluorescent x rays, and the bremsstrahlung and characteristic line radiation scattered from the target. Coherent and incoherent scatter are included in the calculation. To test the th… more
Date: September 1, 1976
Creator: Storm, Ellery
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Rapid characterization of drilled test earth cores by x-ray energy dispersive analysis

Description: The usability of electron microprobe analysis employing x-ray energy-dispersive (EDX) measurements for the characterization of core specimens was demonstrated. The EDX method produced comparable results to the wavelength-dispersive x-ray (WLX) method. The cost per analysis by EDX is approximately 20 percent that of WLX. The EDX method identified the minerals, revealed alteration of the minerals and can form a basis for predicting possible pollutants associated with use of the geothermal energy … more
Date: May 1, 1978
Creator: Tenny, H. & Robertson, D. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Use of ceramic materials in waste-package systems for geologic disposal of nuclear wastes

Description: A study to investigate the potential use of ceramic materials as components in the waste package systems was conducted. The initial objective of the study was to screen and compare a large number of ceramic materials and identify the best materials for the proposed application. The principal method used to screen the candidates was to subject samples of each material to a series of leaching tests and to determine their relative resistance to attack by the leach solutions. A total of 14 ceramic … more
Date: December 1, 1980
Creator: Fullam, H. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Gamma-spectrometry with Compton suppressed detectors arrays

Description: Recent results of experiments performed with two different Compton-suppressed detectors arrays in Daresbury and Berkeley (/sup 163,164/Yb and /sup 154/Er, respectively), are presented together with a brief description of the national French array presently under construction in Strasbourg. 25 refs., 15 figs.
Date: January 1, 1985
Creator: Schueck, C.; Hannachi, F.; Chapman, R.; Lisle, J. C.; Mo, J. N.; Paul, E. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Comparison of detector materials for time-of-flight positron tomography

Description: Knowledge of detection efficiency and timing resolution is essential when comparing detector materials for time-of-flight positron tomography. We present results of Monte Carlo calculations of the detection efficiency of plastic, lead loaded plastic, NaI(T1), liquid xenon, bismuth germanate (BGO), CsF, BaF/sub 2/, Ge, and HgI/sub 2/ for 511 keV photons. We also use recently published values of timing resolution for these detector materials to tabulate the quantity (efficiency)/sup 2//(time reso… more
Date: June 1, 1982
Creator: Derenzo, S.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Actinide removal from aqueous solution with activated magnetite

Description: An actinide aqueous waste treatment process using activated magnetite has been developed at Rocky Flats. The use and effectiveness of various magnetites in lowering actinide concentrations in aqueous solution are described. Experiments indicate that magnetite particle size and pretreatment (activation of the magnetite surface with hydroxyl ions greatly influence the effective use of magnetite as an actinide adsorbent. With respect to actinide removal, Ba(OH)/sub 2/-activated magnetite was more … more
Date: August 10, 1987
Creator: Kochen, R.L. & Thomas, R.L. (ed.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Practical superconductor development for electrical power applications

Description: Development of useful high-critical-temperature (high-{Tc}) superconductors requires synthesis of superconducting compounds; fabrication of wires, tapes, and films from these compounds; production of composite structures that incorporate stabilizers or insulators; and design and testing of efficient components. This report describes technical progress of research and development efforts aimed at producing superconducting components based on the Y-Ba-Cu, Bi-Sr-Ca-Cu, Bi-Pb-Sr-Ca-Cu, and Tl-Ba-Ca… more
Date: October 1, 1991
Creator: Goretta, K.C. (comp.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Direct conversion of methane to C sub 2 's and liquid fuels

Description: Research on promoted metal oxide catalysts has continued with the study of alkaline earth/metal oxide halide catalysts. A barium bromide/alumina catalyst was comparable in methane conversion and selectivity to C{sub 2}'s to barium chloride/alumina catalysts. The effects of varying methane to oxygen feed ratios were explored for one of the best alkaline earth catalysts and one of the best literature catalysts (Li/MgO). A significant decrease in the selectivity to C{sub 2}'s is observed upon addi… more
Date: February 14, 1990
Creator: Warren, B. K.; Campbell, K. D. & Matherne, J. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Effects of barium chlorine treatment of uranium ore on /sup 222/Rn emanation and /sup 226/Ra leachability from mill tailings

Description: The purpose of this laboratory study was to investigate the effectiveness of barium chloride treatment of uranium ore on /sup 222/Rn emanation from mill tailings, /sup 226/Ra level in waste-water, and the leachability of radium from tailings. It has been shown that barium sulfate is an excellent carrier for radium and that barium sulfate crystals have high retention capacity for radon gas produced by radium trapped within the lattice. Ground uranium ore from a mine in Wyoming was mixed with wat… more
Date: January 1, 1985
Creator: Ibrahim, S. A.; Church, S. L. & Whicker, F. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Preparation and some properties of H/sub x/REBa/sub 2/Cu/sub 3/O/sub 7/ (RE = Er, Nd, Dy, Ho, Gd) superconductors

Description: Hydrogen gas has been found to react directly with the subject oxides. Most exhibit a small region of H solid solubility which remains superconducting with a slight increase in critical temperature (1 to 2K). At higher H contents a hydrogen rich hydride phase precipitates which is amorphous. The H rich phases are not superconducting at 4K or above. Neutron diffraction studies of D/sub 1.55/YBa/sub 2/Cu/sub 3/O/sub 7/ confirm that the D rich phase is amorphous but that its precipitation causes i… more
Date: January 1, 1988
Creator: Johnson, J.; Suenaga, M.; Thompson, P. & Reilly, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Superconductivity and Magnetism in Rapidly Solidified Perovskites

Description: The report is divided into six parts, reflecting major thrusts of our work since 1987. The six areas are: molecular orbital theory of high {Tc} superconductivity; rapid solidification processing of oxide superconductors; time dependent magnetic and superconducting properties of these inhomogeneous materials; excess Gd in Gd{sub 1+x}Ba{sub 2-x}Cu{sub 3}O{sub 7-{delta}} perovskites; rapid solidification and directional annealing to achieve high Jc; and Mossbauer studies of T = Fe, Co and Ni site … more
Date: January 1, 1991
Creator: O'Handley, R. C. & Kalonji, Gretchen
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Study of High [Tc] Superconducting Thin Films Grown by MOCVD

Description: Work is described briefly, which was carried out on development of techniques to grow metal-semiconductor superlattices (artificially layered materials) and on the copper oxide based susperconductors (naturally layered materials). The current growth technique utilized is metalorganic chemical vapor deposition (MOCVD). CdTe, PbTe, La, LaTe, and Bi[sub 2]Te[sub 3] were deposited, mostly on GaAs. Several YBa[sub 2]Cu[sub 3]O[sub 7] compounds were obtained with possible superconductivity at tempera… more
Date: January 1, 1990
Creator: Erbil, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Positron-annihilation 2D-ACAR studies of disordered and defected alloys

Description: Theoretical and experimental progess in connection with 2D-ACAR positron annihilation studies of ordered, disordered, and defected alloys is discussed. We present, in particular, some of the recent developments concerning the electronic structure of disordered alloys, and the work in the area of annihilation from positrons trapped at vacancy-type defects in metals and alloys. The electronic structure and properties of a number of compounds are also discussed briefly; we comment specifically on … more
Date: September 1, 1987
Creator: Bansil, A.; Prasad, R.; Smedskjaer, L. C.; Benedek, R. & Mijnarends, P. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Processes for the control of /sup 14/CO/sub 2/ during reprocessing

Description: The fixation of /sup 14/CO/sub 2/ may be required at some future time because of the significant fractional contribution of /sup 14/C, via the ingestion pathway, to the total population dose from the nuclear fuel cycle, even though the actual quantity of this dose is very small when compared to natural background. The work described here was done in support of fuel reprocessing development, of both graphite fuel (HTGRs) and metal-clad fuel (LWRs and LMFBRs), and was directed to the control of /… more
Date: January 1, 1980
Creator: Notz, K.J.; Holladay, D.W.; Forsberg, C.W. & Haag, G.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Immobilization of high level nuclear reactor wastes in SYNROC: a current appraisal. [Synthetic perovskite and hollandite; natural zirconolite and perovskite]

Description: Results are presented for leach testing at 95/sup 0/C and 200/sup 0/C of SYNROC containing 9% and 20% simulated high level radioactive waste, synthetic hollandite and pervoskite samples, and natural zirconolite and pervoskite samples. Single phase synthetic minerals show much higher leach rates than natural mineral samples and polyphase SYNROC samples. Natural zirconolite samples with low radiation damage have leach rates at 200/sup 0/C based on U which are identical to those measured on SYNROC… more
Date: October 13, 1981
Creator: Oversby, V.M. & Ringwood, A.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The EPRI Laboratory experiments at ANL. [Vaporization of core-concrete mixtures]

Description: The vaporization of core-concrete mixtures is being measured using a transpiration method. Mixtures of stainless steel, concrete (limestone or basaltic) and urania (doped with La/sub 2/O/sub 3/, SrO, BaO, and ZrO/sub 2/) are vaporized at 2150 - 2400 K from a zirconia crucible into flowing He - 6% H/sub 2/ gas. Up to 600 ppM H/sub 2/O is added to the gas to fix the partial molar free energy of oxygen in the range -420 kJ to -550 kJ. The fraction of the sample that is vaporized is determined by w… more
Date: October 28, 1987
Creator: Roche, M. F.; Settle, J. L.; Leibowitz, L.; Johnson, C. E. & Ritzman, R. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Studies of the dissolution of geothermal scale

Description: Samples of geothermal scale formed from Magmamax No. 1 and Woolsey No. 1 wells in the Imperial Valley, Calif., were exposed to concentrated and dilute solutions of common laboratory reagents. The time of exposure and temperature of the reagent were also varied. Several reagents easily dissolved significant amounts of the scale. An in situ test was performed with marginal success.
Date: February 4, 1980
Creator: Deutscher, S.B.; Ross, D.M.; Quong, R. & Harrar, J.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Status of radioiodine control for nuclear fuel reprocessing plants

Description: This report summarizes the status of radioiodine control in a nuclear fuel reprocessing plant with respect to capture, fixation, and disposal. Where possible, we refer the reader to a number of survey documents which have been published in the last four years. We provide updates where necessary. Also discussed are factors which must be considered in developing criteria for iodine control. For capture from gas streams, silver mordenite and a silver nitrate impregnated silica (AC-6120) are consid… more
Date: July 1, 1983
Creator: Burger, L.L. & Scheele, R.D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Kinetics of fission product release prior to fuel slumping

Description: This paper describes the primary physical/chemical models recently incorporated into a mechanistic code (FASTGRASS) for the estimation of fission product release from fuel, and compares predicted results with test data. The theory of noble gas behavior is discussed in relation to its effect on the release behavior of I, Cs, Te, Ba, and Sr. The behavior of these fission products in the presence of fuel liquefaction/dissolution and oxidation grain-growth phenomena is presented, as is the chemistr… more
Date: October 1, 1987
Creator: Rest, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Evaluation of ceramic and polymeric materials for use in engineered barrier systems

Description: Ceramic materials evaluated in the screening studies were Al/sub 2/O/sub 3/ (99.8%), mullite, vitreous silica, BaTiO/sub 3/, CaTiO/sub 3/, CaZrO/sub 3/, CaTiSiO/sub 5/, TiO/sub 2/, ZrSiO/sub 4/, basalt, Pyroceram 9617, and Marcor code 9658 machinable glass ceramic. One grade of graphite (Toyotanso IB-11) was also evaluated. Demineralized water, a synthetic Hanford groundwater, and a synthetic NaCl brine solution were used in the screening tests. Demineralized water was used in all five of the l… more
Date: January 1, 1980
Creator: Fullam, H.T. & Skiens, W.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Geochemical modeling research related to the surface disposal of processed oil shale solid waste. [Elements and compounds in oil shale wastes]

Description: Several geochemical codes are available in the literature to model chemical processes such as oxidation-reduction, precipitation-dissolution, formation of solution complex, adsorption, and ion exchange. However, these models differ in the environments to which they apply. The objective of this research was to evaluate the applicability of existing geochemical codes to predict water quality from an oil shale solid waste environment. We selected EQ3/EQ6, GEOCHEM, MINTEQ, PHREEQE, SOLMNEQ, and WAT… more
Date: October 1, 1987
Creator: Reddy, K. J. & Drever, J. I.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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