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Tracer diffusion of /sup 60/Co and /sup 63/Ni in amorphous NiZr alloy

Description: Tracer diffusion of /sup 60/Co and /sup 63/Ni in equiatomic amorphous NiZr alloy in the temperature range between 486 and 641/sup 0/K can be described by: D/sub Co/sup */ = 3.7 x 10/sup -7/ exp(-(135 +- 14) kJ mole/sup -1//RT) m/sup 2//sec and D/sub Ni//sup */ = 1.7 x 10/sup -7/ exp(-(140 +- 9) kJ mole/sup -1//RT) m/sup 2//sec. The values of D/sub Ni//sup */ are in reasonable agreement with those measured by the Rutherford backscattering technique. The measured diffusivities were independent of… more
Date: January 1, 1987
Creator: Hoshino, K.; Averback, R. S.; Hahn, H. & Rothman, S. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Influence of quasi-elastic channels on fusion

Description: Experiments that measure the strength of different transfer reactions in heavy reaction systems at energies in the vicinity of the Coulomb barrier are discussed. A short discussion is given of experimental techniques that are available in this field and their advantages and shortfalls. The main features of the transfer reactions are summarized. Questions concerning the system dependence and energy dependence of the strongest reaction channels are addressed. A systematic picture of the strength … more
Date: March 1, 1986
Creator: Rehm, K.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Evaluation of uncertainties in irradiated hardware characterization: Final report, September 30, 1986-March 31, 1987

Description: Waste Management Group, Inc. has evaluated the techniques used by industry to characterize and classify irradiated hardware components for disposal. This report describes the current practices used to characterize the radionuclide content of hardware components, identifies the uncertainties associated with the techniques and practices considered, and recommends areas for improvement which could reduce uncertainty. Industry uses two different characterization methods. The first uses a combinatio… more
Date: October 1, 1987
Creator: Bedore, N.; Levin, A. & Tuite, P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Recovery and purification of nickel-63 from HFIR-irradiated targets

Description: The production of large quantities of high-specific-activity [sup 63]Ni (>10 Ci/g) requires both a highly enriched [sup 62]Ni target and a long irradiation period at high neutron flux. Trace impurities in the nickel and associated target materials are also activated and account for a significant fraction of the discharged activity and essentially all of the gamma activity. While most of these undesirable activation products can be removed as chloride complexes during anion exchange, chromium, p… more
Date: June 1, 1993
Creator: Williams, D. F.; O'Kelley, G. D.; Knauer, J. B.; Porter, C. E. & Wiggins, J. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Long-term uncertainty in radiological performance assessments of low-level waste facilities at Savannah River Site

Description: Radiological performance assessments are being conducted for the Saltstone Disposal Facility and the E-Area Vaults at the Savannah River Site near Aiken, South Carolina. Saltstone is a solidified waste form which will contain very low levels of radionuclides but considerable levels of nitrate. The E-Area Vaults will contain solid, radioactively contaminated waste. Preliminary results of the assessments indicate that adequate performance will be very sensitive to the degradation scenario adopted… more
Date: January 1, 1991
Creator: McDowell-Boyer, L.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Assay of long-lived radionuclides in low-level wastes from power reactors

Description: The 10 CFR Part 61 waste classification system includes several nuclides which are difficult to assay without expensive radiochemical methods. In order for waste generators to classify wastes practically, NRC Staff has recommended the use of correlation factors to scale the difficult-to-measure nuclides with nuclides which can be measured more easily (i.e., gamma emitters such as /sup 60/Co or /sup 137/Cs). In this study, Science Applications International Corporation (SAIC) performed complete … more
Date: April 1, 1985
Creator: Cline, J.E.; Noyce, J.R.; Coe, L.J. & Wright, K.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Diffusion studies in amorphous NiZr alloys

Description: Tracer impurity and self diffusion measurements have been made on amorphous (a-) NiZr alloys using radioactive tracer, Secondary Ion Mass Spectrometry and Rutherford backscattering techniques. The temperature dependence of diffusion in a-NiZr can be represented in the form D = D/sub 0/exp(-Q/kT), with no structural relaxation effects being observed. The mobility of an atom in a-NiZr increased dramatically with decreasing atomic radius of the diffusing atom and also with decreasing Ni content fo… more
Date: June 1, 1987
Creator: Hahn, H.; Averback, R. S.; Hoshino, K. & Rothman, S. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Grain-boundary diffusion: structural effects, models and mechanisms

Description: Grain boundary diffusion phenomena were considered including: anisotropy, effect of orientation, crystallographic transformation, boundary type, dislocation dissociation, pressure, and isotope effects. Diffusivity is different for various boundaries. Dissociated dislocations and stacking faults are not efficient paths for grain boundary diffusion. Results suggest a vacancy mechanism along the dislocation core, and involves atomic jumps away from the back towards the dislocation as well as jumps… more
Date: January 1, 1979
Creator: Peterson, N. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Measurement of long-lived isotopes in fusion materials

Description: Neutron cross section measurements are reviewed for the production of long-lived isotopes in fusion reactor materials. Samples were irradiated at 14.5 to 14.8 MeV at the RTNSII facility. Long-lived reaction products were detected using gamma and x-ray spectroscopy, liquid scintillation spectrometry, and accelerator mass spectrometry. Radiochemical separations were performed for many samples prior to analysis. Results are summarized for reactions leading to /sup 26/Al (720,000 y), /sup 53/Mn (3,… more
Date: January 1, 1987
Creator: Greenwood, L.R. & Bowers, D.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Bioaccumulation and food chain transfer of corrosion products from radioactive stainless steel

Description: Two sets of experiments were conducted to determine if corrosion products from radioactive Type 347 stainless steel could be biologically transferred from sediment through a marine food chain, and whether corrosion products dissolved in seawater could be bioaccumulated and then eliminated. Corrosion products containing /sup 60/Co and /sup 63/Ni from the radioactive stainless steel were introduced into marine sediments. Infaunal polychaete worms exposed to these sediments bioaccumulated the radi… more
Date: July 1, 1986
Creator: Young, J. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Mechanisms of impurity diffusion in rutile

Description: Tracer diffusion of /sup 46/Sc, /sup 51/Cr, /sup 54/Mn, /sup 59/Fe, /sup 60/Co, /sup 63/Ni, and /sup 95/Zr, was measured as functions of crystal orientation, temperature, and oxygen partial pressure in rutile single crystals using the radioactive tracer sectioning technique. Compared to cation self-diffusion, divalent impurities (e.g., Co and Ni) diffuse extremely rapidly in TiO/sub 2/ and exhibit a large anisotropy in the diffusion behavior; divalent-impurity diffusion parallel to the c-axis i… more
Date: January 1, 1984
Creator: Peterson, N. L. & Sasaki, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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[Research programs from the University of South Carolina on High Energy Physics]. Technical progress report for 1992

Description: Work on three main experiments is summarized: (1) study of charm physics in a wide-band photon beam; (2) charmless two-body decays of b-flavored mesons and baryons studied with a ring imaging Cherenkov counter; and (3) the AMY Program, which studies e{sup +}e{sup {minus}} interactions using the TRISTAN collider at KEK, with emphasis on trigger upgrades. Future work related to the existence of a 17-keV neutrino in {beta} decay and {nu}{sub {mu}}/{nu}{sub {tau}} oscillation is described.
Date: February 1, 1993
Creator: Rosenfeld, C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Recovery and purification of nickel-63 from HFIR-irradiated targets

Description: The production of large quantities of high-specific-activity {sup 63}Ni (>10 Ci/g) requires both a highly enriched {sup 62}Ni target and a long irradiation period at high neutron flux. Trace impurities in the nickel and associated target materials are also activated and account for a significant fraction of the discharged activity and essentially all of the gamma activity. While most of these undesirable activation products can be removed as chloride complexes during anion exchange, chromium, p… more
Date: June 1, 1993
Creator: Williams, D. F.; O`Kelley, G. D.; Knauer, J. B.; Porter, C. E. & Wiggins, J. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Environmental Assessment for DOE permission for off-loading activities to support the movement of Millstone Unit 2 steam generator sub-assemblies across the Savannah River Site

Description: The Department of Energy (DOE) has prepared an Environmental Assessment (EA), for the proposed granting of DOE permission of offloading activities to support the movement Millstone Unit 2 steam generator sub-assemblies (SGSAs) across the Savannah River Site (SRS). Based on the analyses in the EA, DOE has determined that the proposed action is not a major Federal action significantly affecting the quality of the human environment within the meaning of the National Environmental Policy Act (NEPA)… more
Date: October 1, 1992
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Low-energy beta spectroscopy using pin diodes to monitor tritium surface contamination

Description: We show that tritium betas emitted from a surface can be counted using a pin photodiode as a solid state charged particle detector. Furthermore, we show that the range of tritium betas through air is sufficient to allow measurement of tritium on samples in air by this method. These two findings make possible a new method to survey tritium surface contamination which has advantages over existing methods. We have built and tested several prototype instruments which use this method to measure trit… more
Date: June 1, 1994
Creator: Wampler, W. R. & Doyle, B. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Preliminary survey of separations technology applicable to the pretreatment of Hanford tank waste (1992--1993)

Description: The US Department of Energy has established the Tank Waste Remediation System (TWRS) to manage and dispose of radioactive wastes stored at the Hanford Site. Within this program are evaluations of pretreatment system alternatives through literature reviews. The information in this report was collected as part of this project at Pacific Northwest Laboratory. A preliminary survey of literature on separations recently entered into the Hanford electronic databases (1992--1993) that have the potentia… more
Date: April 1, 1994
Creator: Lawrence, W. E. & Kurath, D. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Beta decay anomalies and the 17-keV conundrum

Description: Recent developments in pursuance of the 17-keV neutrino are reviewed. Several different experiments found anomalies in {beta} decay spectra which were consistently interpreted as evidence for a heavy neutrino. On the other hand, recent null results definitively rule out the existence of a 17-keV neutrino, as well as escaping criticisms applicable to earlier experiments. While missing links remain, it seems that any strong evidence for a 17-keV neutrino has vanished. Specifically, the anomalies … more
Date: March 1, 1993
Creator: Hime, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Radiological characterization of spent control rod assemblies

Description: This document represents the final report of an ongoing study to provide radiological characterizations, classifications, and assessments in support of the decommissioning of nuclear power stations. This report describes the results of non-destructive and laboratory radionuclide measurements, as well as waste classification assessments, of BWR and PWR spent control rod assemblies. The radionuclide inventories of these spent control rods were determined by three separate methodologies, including… more
Date: October 1, 1995
Creator: Lepel, E. A.; Robertson, D. E.; Thomas, C. W.; Pratt, S. L. & Haggard, D. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A decommissioning plan for the Heavy Water Components Test Reactor

Description: Three alternatives to decommission the Heavy Water Components Test Reactor (HWCTR) have been analyzed as summarized in Table 1. The protective confinement approach is advantageous as long as current activities onsite limit access by the general public; excellent confinement of the residual activity is provided by in situ dry storage as the radiation from {sup 60}Co diminishes. Entombment provides the most-secure confinement of the activity but at some increased cost. Dismantling HWCTR has no ap… more
Date: January 1, 1976
Creator: Owen, M. B. & Field, F. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

[Research programs from the University of South Carolina on High Energy Physics]. [119 Technical Progress Report]

Description: Work on three main experiments is summarized: (1) study of charm physics in a wide-band photon beam; (2) charmless two-body decays of b-flavored mesons and baryons studied with a ring imaging Cherenkov counter; and (3) the AMY Program, which studies e[sup +]e[sup [minus]] interactions using the TRISTAN collider at KEK, with emphasis on trigger upgrades. Future work related to the existence of a 17-keV neutrino in [beta] decay and [nu][sub [mu]]/[nu][sub [tau]] oscillation is described.
Date: January 1, 1993
Creator: Rosenfeld, C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Experimental permeability studies at elevated temperature and pressure of granitic rocks

Description: Permeability of quartz monzonite from the Los Alamos hot-dry-rock geothermal well GT-2 was experimentally measured as a function of pressure and temperature. Permeability of the GT-2 rocks from depths of 8580 ft and 9522 ft behaves like Westerly granite for changes in effective confining pressure. However, permeability of these rocks behaves much differently with increasing temperature. As temperature is increased, the permeability of Westerly granite passes through a slight minimum and then in… more
Date: May 1, 1978
Creator: Potter, J. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Beta decay anomalies and the 17-keV conundrum

Description: Recent developments in pursuance of the 17-keV neutrino are reviewed. Several different experiments found anomalies in [beta] decay spectra which were consistently interpreted as evidence for a heavy neutrino. On the other hand, recent null results definitively rule out the existence of a 17-keV neutrino, as well as escaping criticisms applicable to earlier experiments. While missing links remain, it seems that any strong evidence for a 17-keV neutrino has vanished. Specifically, the anomalies … more
Date: January 1, 1993
Creator: Hime, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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