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Modeling studies on the precipitation of Kr after implantation into metals

Description: A rate-theory approach is applied to interpreting observations on the precipitation of Kr injected into Ni at temperatures between 25 and 560/degree/C. At temperatures of 400/degree/C or higher, the implanted Kr precipitates evolve into a bi-modal size distribution containing small solid precipitates and an additional population of larger, faceted bubbles. The calculations explore the dependence of the observed bi-modal distribution on the maximum size of the solid Kr precipitates and the effec… more
Date: February 1, 1988
Creator: Rest, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Analysis of fission product behavior in the Saclay Spitfire Loop Test SSL-1. [HTGR]

Description: The behavior of the fission metal cesium and the fission gases krypton and xenon in the Saclay Spitfire Loop SSL-1 test has been compared to that predicted using General Atomic reference data and computer code models. This is the first in a series of analyses planned in order to provide quantitative validation of HTGR fission product design methods. In this analysis, the first attempt to rigorously verify fission product design methods, the FIPERQ code was used to model the diffusion of cesium … more
Date: February 1, 1978
Creator: Jensen, D. D.; Haire, M. J. & Ballagny, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental investigation of the chemistry of excited states of rare gases. First quarterly progress report, October 15, 1977--January 15, 1978

Description: The quenching of XeF(B) was studied using the steady-state photolysis of XeF/sub 2/ as the source of XeF(B). The product states from the sensitized reaction of Xe(/sup 3/P/sub 1/) with Cl/sub 2/ and COCl/sub 2/ also were studied. The new XeF(B) quenching rate constants are described. The pulsed laser induced fluorescence technique was used to measure radiative lifetimes and two-body quenching rate constant (with Ar) for the low energy Xe(6p)* states. Serious signal/noise problems for the lowest… more
Date: February 1978
Creator: Setser, D. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Krypton retention on solid adsorbents. [Activated alumina; hydrogen mordenite, silver mordenite, sodium mordenite, cerium mordenite-H, cerium mordenite-Na, potassium mordenite-H, potassium mordenite-Na]

Description: An experimental laboratory program was conducted to develop economical solid adsorbents for the retention of krypton from a dissolver off-gas stream. The study indicates that a solid adsorbent system is feasible and competitive with other developing systems which utilize fluorocarbon absorption nd cryogenic distillation. This technology may have potential applications not only in nuclear fuel reprocessing plants, but also in nuclear reactors and in environmental monitoring. Of the 13 prospectiv… more
Date: January 1, 1982
Creator: Monson, P.R. Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Inner-shell photoemission from atoms and molecules using synchrotron radiation

Description: Photoelectron spectroscopy, in conjunction with synchrotron radiation, has been used to study inner-shell photoemission from atoms and molecules. The time structure of the synchrotron radiation permits the measurements of time-of-flight (TOF) spectra of Auger and photoelectrons, thereby increasing the electron collection efficiency. The double-angle TOF method yielded angle-resolved photoelectron intensities, which were used to determine photoionization cross sections and photoelectron angular … more
Date: December 1, 1983
Creator: Lindle, D.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Discharge excitation of the XeF C to A transition

Description: Recent success in high efficiency and high energy laser extraction of tunable radiation in the blue-green C-A transition of XeF under intense, short-pulse electron beam excitation has renewed interest in the possibility of similar performance in avalanche discharges. We present preliminary results of discharge excited fluorescence studies in a variety of devices having different degrees of energy loading.
Date: January 1, 1987
Creator: Sze, R. C.; Greene, D. P.; Bigio, I. J.; Shay, T. M.; McCown, A. W.; Figueira, J. F. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Multi-pion production

Description: Preliminary analysis of pion production in 1.2 GeV/nucleon Kr-RbBr collisions is presented. The negative pion multiplicity is consistent with a convolution of Poisson distributions and a freeze-out density between 1/3 and 1/2 normal nuclear density is extracted. Global negative pion kinematic variables are used to search for possible structure in the multi-pion emission. No evidence for structured emission or conservation constraints is found. Pion interferometry analysis gives a source radius … more
Date: January 1, 1984
Creator: Beavis, D.; Fung, S.Y.; Gorn, W.; Keane, D.; Liu, Y.M.; Poe, R.T. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Nuclear waste management. Quarterly progress report, January-March 1980

Description: Reported are: high-level waste immobilization, alternative waste forms, nuclear waste materials characterization, TRU waste immobilization, TRU waste decontamination, krypton solidification, thermal outgassing, iodine-129 fixation, unsaturated zone transport, well-logging instrumentation development, mobile organic complexes of fission products, waste management system and safety studies, assessment of effectiveness of geologic isolation systems, waste/rock interactions, engineered barriers, cr… more
Date: June 1, 1980
Creator: Platt, A.M. & Powell, J.A. (comps.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Calibration of a monochromator/spectrometer system for the measurement of photoelectron angular distributions and branching ratios

Description: We describe the techniques used in calibrating a monochromator/spectrometer system for gas-phase photoelectron angular distribution and branching ratio measurements. We report a self-consistent set of values for the Ne 2p, Ar 3p, Kr 4p/sub 3/2/ and 4p/sub 1/2/, and Xe 5p/sub 3/2/ and 5p/sub 1/2/ photoelectron asymmetry parameters and for the Kr 4p/sub 3/2/:4p/sub 1/2/ and Xe 5p/sub 3/2/:5p/sub 1/2/ branching ratios for the energy regions from threshold to approximately 15 iV. 22 refs., 7 figs.
Date: January 1, 1985
Creator: Southworth, S. H.; Parr, A. C.; Hardis, J. E.; Dehmer, J. L. & Holland, D. M. P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Vacuum ultraviolet light generation applications to resonance ionization spectroscopy

Description: A theoretical discussion is given for sum mixing with unfocused Gaussian beams. The four-wave sum and difference mixing are carried out in two ''active'' gases: xenon and krypton. In the negatively dispersive regions buffer gases are added to achieve phase matching. 6 refs., 2 figs. (WRF)
Date: August 1, 1986
Creator: Payne, M.G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Nuclear-waste-management. Quarterly progress report, July-September 1981

Description: Progress reports and summaries are presented for the following: high-level waste process development, alternate waste forms; TMI zeolite vitrification demonstration program; nuclear waste materials characterization center; TRU waste immobilization; TRU waste decontamination; krypton implantation; thermal outgassing; iodine-129 fixation; NWVP off-gas analysis; monitoring and physical characterization of unsaturated zone transport; well-logging instrumentation development; verification instrument… more
Date: December 1, 1981
Creator: Chikalla, T. D. & Powell, J. A. (comps.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Weak interaction studies using resonance ionization spectroscopy

Description: Important developments in laser sources for the vacuum ultraviolet (VUV) region of the spectrum are making it possible to carry out resonance ionization of some of the noble gases. It has already been shown that xenon can be ionized in a two-photon allowed excitation from the ground state. Recently a new method of generating radiation by four-wave mixing in mercury vapor enables excitation of xenon in a one-photon resonance process. With these new laser sources we expect to have effective ioniz… more
Date: January 1, 1982
Creator: Payne, M.G. & Hurst, G.S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Total scattering cross sections and interatomic potentials for neutral hydrogen and helium on some noble gases

Description: Measurements of energy-dependent scattering cross sections for 30 to 1800 eV D incident on He, Ne, Ar, and Kr, and for 40 to 850 eV He incident on He, Ar, and Kr are presented. They are determined by using the charge-exchange efflux from the Princeton Large Torus tokamak as a source of D or He. These neutrals are passed through a gas-filled scattering cell and detected by a time-of-flight spectrometer. The cross section for scattering greater than the effective angle of the apparatus (approx. =… more
Date: April 1, 1985
Creator: Ruzic, D.N. & Cohen, S.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Single-column-based absorption process for treating dissolver off-gas

Description: The fluorocarbon absorption process for krypton and xenon removal from dissolver off-gas is based on exploitation of solubility differences which exist among noble gases and other gas-phase constituents in the fluorocarbon solvent dichlorofluoromethane (refrigerant-12). Process performance and reliability have been demonstrated on an engineering scale with over 10 years of pilot plant operation, including testing with /sup 85/Kr, /sup 133/Xe, and /sup 131/I. The culmination of this work is a si… more
Date: May 21, 1982
Creator: Eby, R. S.; Little, D. K.; Merriman, J. R. & Stephenson, M. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Carbon dioxide-krypton separation and radon removal from nuclear-fuel-reprocessing off-gas streams

Description: General Atomic Company (GA) is conducting pilot-plant-scale tests that simulate the treatment of radioactive and other noxious volatile and gaseous constituents of off-gas streams from nuclear reprocessing plants. This paper reports the results of engineering-scale tests performed on the CO/sub 2//krypton separation and radon holdup/decay subsystems of the GA integrated off-gas treatment system. Separation of CO/sub 2/ from krypton-containing gas streams is necessary to facilitate subsequent wa… more
Date: July 1, 1982
Creator: Hirsch, P. M.; Higuchi, K. Y. & Abraham, L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Laser discharges in attaching gases, June 25, 1976--June 24, 1977. Final report

Description: A significant problem in the development of high-power gas discharge lasers is the glow-to-arc transition, which limits the electrical energy that can be deposited in the diffuse glow plasma, especially in attaching gases. A combined experimental and theoretical study of the maintenance and stability of glow discharges in attaching gas mixtures similar to those used in rare gas-halide excimer laser discharges is described. A discharge test apparatus has been constructed for establishing uv-prei… more
Date: September 1, 1977
Creator: Rogoff, G. L.; Kline, L. E.; Pack, J. L. & Kasner, W. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Nuclear waste management quarterly progress report, April--June 1977

Description: Progress is reported in sections on decontamination and densification of chop-leach cladding residues, monitoring methods for effluents from waste solidification, TRU waste fixation studies, krypton solidification, /sup 14/C and /sup 129/I fixation, waste management system studies, waste isolation assessment, stored waste migration monitoring, properties of fission product organic complexes, and decontamination of metals. (JRD)
Date: November 1, 1977
Creator: Platt, A.M. (comp.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Nuclear waste management. Quarterly progress report, October-December 1979

Description: Progress and activities are reported on the following: high-level waste immobilization, alternative waste forms, nuclear waste materials characterization, TRU waste immobilization programs, TRU waste decontamination, krypton solidification, thermal outgassing, iodine-129 fixation, monitoring of unsaturated zone transport, well-logging instrumentation development, mobile organic complexes of fission products, waste management system and safety studies, assessment of effectiveness of geologic iso… more
Date: April 1, 1980
Creator: Platt, A.M. & Powell, J.A. (comps.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Fundamental studies in isotope chemistry. Progress report, 1 July 1976--30 Jun 1977

Description: The current thrust of the program is the use of isotope effects to study the fundamental properties of matter, measurement and calculation of isotope fractionation factors of systems of potential technological importance and the correlation of isotope effects with molecular structure. The first measurements of the isotopic fractionation factors for two components in a solution were completed by the study of argon-krypton mixtures. The measurements cover the range from pure argon to pure krypton… more
Date: January 1, 1977
Creator: Bigeleisen, J. & Harris, T.H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Krypton entrapment in pulse biased sputter-deposited metals

Description: A supported gas discharge sputtering system was constructed to investigate krypton entrapment in high-rate sputter-deposited thick films. Krypton entrapment was studied as a function of substrate and target voltage for nickel, aluminum, titanium and iron deposits. Control of substrate and target voltages was achieved with pulse circuits capable of adjusting the pulse duration and repetition rate. A water-cooled cylindrical copper substrate 15 cm in diameter was used to collect the sputtered met… more
Date: January 1, 1978
Creator: Bayne, M. A.; Moss, R. W. & McClanahan, E. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Resonantly-enhanced, four-photon ionization of krypton at laser intensities exceeding 10/sup 13/ W/cm/sup 2/

Description: The yield of singly- and multiply- charged ions of krypton and xenon is presented as a function of laser intensity and frequency. The measurements were performed using the second harmonic output of a well-characterized, tunable picosecond dye laser in the range 285 to 310 nm at laser intensities from 1 x 10/sup 12/ to 10/sup 14/ W/cm/sup 2/. Enhancement of the Kr/sup +/ yield by two orders of magnitude by three-photon resonant, four-photon ionization is observed in the vicinity of the 4d'(5/2)/… more
Date: December 1, 1987
Creator: Perry, M.D.; Landen, O.L. & Campbell, E.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Assessment of improved fission-product transport models in VICTORIA against the ORNL HI and VI tests

Description: New models for the release of fission-products from fuel have recently been incorporated into a comprehensive code, VICTORIA, for the prediction of radionuclide behavior under severe reactor accident conditions as an alternative to a simple Booth diffusion calculation. It is widely known that the Booth model has severe limitations when used under conditions of changing temperature and power. A new transport model based on a two node diffusive flow formulation has been implemented into VICTORIA.… more
Date: January 1, 1991
Creator: Domagala, P.; Rest, J. & Zawadzki, S.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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