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PROCESSES FOR RECOVERY OF URANIUM AND THORIUM FROM GRAPHITE-BASE FUEL ELEMENTS. PART II
Laboratory-scale tests on methods for recovering uranium and thorium from graphite-base reactor fuel elements are reported. The 90% HNO/sub 3/ process, which involves simultaneous disintegration and leaching in 21 M HNO/sub 3/, is applicable to all fuel elenments which do not contain coated fuel particles. Leaching of irradiated (0.001% burnup) fuels containing 3 and 12% uranlum recovered approximates 99.3 and 99.9%, respectively, of the uranium in two 4-hr leaches with boiling acid. The graphite residue retained > 50% of the long-lived fission products. Three successive leaches of fuel containing uranium and thorium recovered approximates 99% of both elements. Uranium recoveries by combustion in oxygen followed by dissolution of the ash hn nitric acid or fluorlde-catalyzed nitric acid are quantitative only when the fuel is not coated, does not contain Al/sub 2/O/sub 3/-coated fuel particles, and is free from impurities such as iron. During combustion up to 95% of the Ru-106 was volatilized from irradiated specimens. Recoveries, by leaching with 70% HNO/sub 3/, from fuel specimens containing Al/sub 2/O/sub 3/-coated fuel particles were greater than 99% when the specimens were ground finer than 200 mesh to ensure crushing of the fuel particles. (auth)
Date:
November 30, 1961
Creator:
Ferris, L.M.; Kibbey, A.H. & Bradley, M.J.
Object Type:
Report
System:
The UNT Digital Library
STUDIES OF THE SCINTILLATION PROCESS IN CsI(Tl)
The scintillation response of CsI(Tl) crystals, having various thallium contents, was measured for excitation of the crystals by monoenergetic gamma rays, protons, and alpha particles. The investi gation was made to provide a test of some of the features of a theoretical model of the scintillation process in thallium-activated alkali iodides proposed by Murray and Meyer. In order to insure that the results obtained in this program would provide a critical test of the scintillation model, special attention was paid to technical effects which could influence the interpretation of the experimental data. For example, the effect of the pulseanalysis time on the relative scintillation response of CsI(Tl) to various charged parti cles was investigated. In addition, the emission spectra of the CsI(Tl) crystals were measured for excitation by x rays, protons, and alpha particles. The results of the investigation showed that the scintillation efficiency of CsI(Tl) is a continuous function of dE/dx, as assumed in the scintillation model, within the accuracy of the experiments when the effect of delta ravs are considered. This led to the conclusion that the light output of CsI(Tl) crystals is, in general, a nonlinear function of the energy of the particle. The shape of the …
Date:
November 30, 1962
Creator:
Gwin, R. & Murray, R. B.
Object Type:
Report
System:
The UNT Digital Library
Design of a water jet drill for development of geothermal resources. Progress report, October 1--November 30, 1977
Progress is reported in the evaluation of the performance of a water jet drill in a stressed rock, particularly in drilling at hole diameters in excess of one inch. Drilling tests are being carried out in a barrier pillar in a layer of coarse, lead-bearing sandstone. Problems encountered in the test drilling are discussed. (JGB)
Date:
November 30, 1977
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
General Chemistry Division quarterly report, July--September 1977
Analytical research and development work is reported on multielement analysis, time-resolved spectroscopy, fluorescence analysis, ionization potential of NP, excited state chemistry, polarized x ray sources, potentiometric titration of Na, determination of TATB in DMSO, determination of nitrobenzene in TATB, analysis of explosive composites, mass spectrometer automation, mass spectra calculation, solids formation in geothermal brine, water quality laboratory automation, aerosol coagulation, and multiple-gas analyzers. (JRD)
Date:
November 30, 1977
Creator:
Harrar, J.E. (ed.)
Object Type:
Report
System:
The UNT Digital Library
Tritium related safety considerations for mirror upgrades
One of the primary objectives of the MFTF-B upgrades is to demonstrate the technology of tritium breeding in a reactor-like configuration. This requires use and processing of tritium, involving an inventory of several hundred grams at the plant. This paper reviews the results of a preliminary assessment of the radiation hazard associated with the handling of tritium. The radiation dose consequences due to tritium release from normal operation and due to postulated accidents on plant personnel and the public were assessed. Maximum credible (probability < 10/sup -3/, but > 10/sup -7//yr) accidental releases were estimated to be 10 gm in the reactor building and 100 gm in the tritium-processing building. Higher probability (> 10/sup -3//yr) accidents or component failures would result in much smaller releases. In the reactor building, the most severe accident would result from the rupture of a plasma exhaust duct from the end cell or the tritium feed pipe to the neutral beam injector, accompanied by a fire. In the tritium processing building, the most severe accident would be the rupture of the Isotope Separation System (ISS) distillation columns and vacuum jackets accompanied by a fire.
Date:
November 30, 1983
Creator:
Ghose, S.K.
Object Type:
Article
System:
The UNT Digital Library
[News Clip: GATT protest]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
November 30, 1994, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
NOVA laser facility for inertial confinement fusion
The NOVA laser consists of ten beams, capable of concentrating 100 to 150 kJ of energy (in 3 ns) and 100 to 150 TW of power (in 100 ps) on experimental targets by 1985. NOVA will also be capable of frequency converting the fundamental laser wavelength (1.05 ..mu..m) to its second (0.525 ..mu..m) or third (0.35 ..mu..m) harmonic. This additional capability (80 to 120 kJ at 0.525 ..mu..m, 40 to 70 kJ at 0.35 ..mu..m) was approved by the US Department of Energy (DOE) in April 1982. These shorter wavelengths are much more favorable for ICF target physics. Current construction status of the NOVA facility, intended for completion in the autumn of 1984, will be presented.
Date:
November 30, 1983
Creator:
Simmons, W.W.
Object Type:
Article
System:
The UNT Digital Library
Cadmium sulfide/copper sulfide heterojunction cell research. Quarterly technical progress report, June 1-September 30, 1979
Off-stoiciometry CdS coatings with resistivities of about 10..cap omega..-cm have been deposited by a cyclic reactive sputtering process where the H/sub 2/S injection is periodically switched on and off. Cells with CdS layer fabricated in this way have yielded efficiencies of about 0.6% with short circuit currents of about 3.5 mA/cm/sup 2/, open circuit voltages of about 0.43V, and fill factors of about 0.40. CdS resistivity control by In doping has been achieved both by diffusion from a pre-deposited In layer and by using an In-doped Cd sputtering target. Resistivities of about 30..cap omega..-cm are achieved in CdS coatings about 5 um thick deposited at 250/sup 0/C over 50 nm thick In layers. A Cd cathode doped with 1 atomic percent In has yielded CdS coatings with resistivities of about 0.1 ..cap omega..-cm at substrate temperatures in the 100 to 300/sup 0/C range. Cells fabricated from the 0.1 ..cap omega..-cm CdS with a 0.5 um undoped layer adjacent to the junction have yielded encouraging diode characteristics with a strong photovoltaic effect and will be used to an optimization study. Cu/sub x/S coatings deposited onto CdS under various conditions have been found to have the same properties as those deposited onto …
Date:
November 30, 1979
Creator:
Thornton, J.A.
Object Type:
Report
System:
The UNT Digital Library
Nuclear criticality information system
The nuclear criticality safety program at LLNL began in the 1950's with a critical measurements program which produced benchmark data until the late 1960's. This same time period saw the rapid development of computer technology useful for both computer modeling of fissile systems and for computer-aided management and display of the computational benchmark data. Database management grew in importance as the amount of information increased and as experimental programs were terminated. Within the criticality safety program at LLNL we began at that time to develop a computer library of benchmark data for validation of computer codes and cross sections. As part of this effort, we prepared a computer-based bibliography of criticality measurements on relatively simple systems. However, it is only now that some of these computer-based resources can be made available to the nuclear criticality safety community at large. This technology transfer is being accomplished by the DOE Technology Information System (TIS), a dedicated, advanced information system. The NCIS database is described.
Date:
November 30, 1981
Creator:
Koponen, B. L. & Hampel, V. E.
Object Type:
Article
System:
The UNT Digital Library
Controlled Synthesis of Polyenes by Catalytic Methods. Progress Report for the period December 1, 1989 - November 30, 1992
A more direct approach to polyenes by the direct polymerization of acetylenes has been achieved. We were able to show that polymerization of acetylene itself can be controlled with a well- characterized alkylidene catalyst, but only if a base such as quinuclidine is present in order to slow down the rate of propagation relative to initiation. (Quinuclidine may also stabilize vinylalkylidene intermediates formed in the reaction). Unfortunately, living polyenes'' were no more stable than isolated polyenes, and so this approach had its limitations. Direct polymerization of acetylene by Mo(CH-t-Bu)(NAr)(O-t-Bu){sub 2} was more successful, but inherent polyene instability was still a problem. The most important result of the past grant period is the finding that dipropargyl derivatives (HC=CCH{sub 2}XCH{sub 2}C=CH; X = CH{sub 2}, C(CO{sub 2}R){sub 2}, SiR{sub 2}, etc.), which have been reported to be cyclopolymerized by various classical catalysts by as yet unknown mechanisms, are polymerized by Mo(CH-t-Bu)(NAr)(OCMe(CF{sub 3}){sub 2}){sub 2} in dimethoxyethane. We speculate that intramolecular formation of a five-membered ring in the product of {alpha} addition is fast enough to yield another terminal alkylidene on the time scale of the polymerization reaction, while a six-membered ring is formed in a reaction involving a more reaction terminal alkylidene. …
Date:
November 30, 1992
Creator:
Schrock, R. R.
Object Type:
Report
System:
The UNT Digital Library
[News Clip: Grapevine]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
November 30, 1993, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
Design of a separator/neutralizer to limit impurities and non-primary species in the Mirror Fusion Test Facility
The optimum plasma for the tandem Mirror Fusion Test Facility (MFTF-B) at Lawrence Livermore National Laboratory (LLNL) is very sensitive to heavy contaminates, such as oxygen and metals. Unfortunately the current neutral beam sources generate not only high energy deuterium particles but also high energy oxygen particles. A new MFTF-B separator/neutralizer has been designed to filter out the unwanted oxygen and allow only primary species neutrals to reach the plasma.
Date:
November 30, 1983
Creator:
Goldner, A.I.
Object Type:
Article
System:
The UNT Digital Library
Transport and thermodynamic properties of solids. Final report
During the last year of operation the principal area of research has been ternary diffusion in solid solution alloys. Specific research projects deal with diffusion in the Cu--Ni--Zn and Fe--Ni--Al systems. Research activities in these areas are summarized.
Date:
November 30, 1977
Creator:
Grace, R.E. & Dayananda, M.A.
Object Type:
Report
System:
The UNT Digital Library
Systems study for the use of geothermal energies in the Pacific Northwest. Final report, June 1, 1974--November 30, 1974
None
Date:
November 30, 1974
Creator:
Bodvarsson, G.; Boersma, L.; Couch, R.; Davis, L. & Reistad, G.
Object Type:
Report
System:
The UNT Digital Library
Anisotropic yielding of rocks at high temperatures and pressures; Annual Progress Report, 1988-1989
The experimental results we have obtained on Four-Mile gneiss have demonstrated that the yield behavior of quartzo-feldspathic rocks containing only a small percentage (10%) of mica can be markedly anisotropic, provided the mica minerals exhibit a strong crystallographic preferred orientation. Samples of gneiss oriented such that resolved shear stresses on the foliation plane are large are considerably weaker than granites of similar grain size and composition, and this weakness is attributed to enhanced nucleation of microcracks in quartz and feldspar adjacent to mica grains that are suitably oriented for slip. We expect the yield behavior of rocks containing a higher proportion of phyllosilicates to be influenced by the strongly anisotropic nature of these minerals as well, although the strengths, temperature and pressure dependencies, and flow-controlling mechanisms in such rocks may be significantly different.
Date:
November 30, 1989
Creator:
Kronenberg, A. K.; Russell, J. E. & Carter, N. L.
Object Type:
Report
System:
The UNT Digital Library
Coal as an option for power generation in US territories of the Pacific
A survey of general considerations relating to the use of coal in US territories and trust territories of the Pacific suggests that coal is a viable option for power generation. Future coal supplies, principally from Australia and the west coast of America, promise to be more than adequate, but large bulk carriers will probably not be able to land coal directly because of inadequate port facilities. Hence, smaller than Panamax-class vessels (60,000 dwt) or some arrangement utilizing self-loading barges or lighters would have to be used. Except for Guam, with peak power requirements on the order of 175 MW/sub e/, most territories have current, albeit inadequate, installations of 1 to 25 MW/sub e/ Turnkey, conventional-coal-fired, electrical-power generating systems are available in that size range. US environmental laws are now applicable to Guam and American Samoa; the trust territories are exempt. However, the small power requirements of many small islands will qualify for exemption from the New Source Performance Standards called for in the Clean Air Act. The principal problems with coal use in the territories, apart from the shallow draft of most harbors, are the limited amount of land available and the high capital costs associated with conversion. Ocean dumping …
Date:
November 30, 1981
Creator:
Borg, I. Y.
Object Type:
Report
System:
The UNT Digital Library
The Logan County News. (Crescent, Okla.), Vol. 14, Ed. 1 Thursday, November 30, 1916
Weekly newspaper from Crescent, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 30, 1916
Creator:
Jent, H. C.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Mangum Star. (Mangum, Okla.), Vol. 11, Ed. 1 Wednesday, November 30, 1898
Weekly newspaper from Mangum, Oklahoma that includes local, territorial, and national news along with advertising.
Date:
November 30, 1898
Creator:
Townsend, G. B. & Wileman, J. M.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Taloga Times-Advocate (Taloga, Okla.), Vol. 29, No. 25, Ed. 1 Thursday, November 30, 1922
Weekly newspaper from Taloga, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 30, 1922
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Mangum Star. (Mangum, Okla. Terr.), Vol. 18, No. 22, Ed. 1 Thursday, November 30, 1905
Weekly newspaper from Mangum, Oklahoma that includes local, territorial, and national news along with advertising.
Date:
November 30, 1905
Creator:
Echols, R. C.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Oklahoma Democrat (Altus, Okla.), Vol. 9, No. 38, Ed. 1 Thursday, November 30, 1916
Weekly newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 30, 1916
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Oklahoma State Register (Guthrie, Okla.), Vol. 26, No. 30, Ed. 1 Thursday, November 30, 1916
Weekly newspaper from Guthrie, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 30, 1916
Creator:
Golobie, John
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Mangum Mirror (Mangum, Okla.), Vol. 1, No. 74, Ed. 1 Friday, November 30, 1917
Semi-weekly newspaper from Mangum, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 30, 1917
Creator:
Gilmour, C. L.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Ashland News (Ashland, Okla.), Vol. 1, No. 19, Ed. 1 Thursday, November 30, 1911
Weekly newspaper from Ashland, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 30, 1911
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History