37 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Strontium"  
Results: 1 - 24 next
open access

Microstructural interactions of geologic media with waste radionuclides

Description: A preliminary investigation of the microstructure of four geologic media was taken to examine the interaction of Cs, Sr, Gd and U with those media. Since K/sub D/ measurements often vary by more than an order of magnitude on rocks of the same strata separated by several feet, it was probable that minor rock components play an important role in radionuclide sorption. A qualitative analysis of the rock surfaces after equilibration with solutions of Cs/sup +/, Sr/sup + +/, Gd/sup + + +/ and UO/sub… more
Date: March 1, 1978
Creator: Hinkebein, T. E. & Hlava, P. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Investigation of the transport of actinide-bearing soil colloids in the soil-aquatic environment

Description: Research indicated that organic and inorganic particles strongly influence the distribution ratios of Am(III), Np(V), and Cm(III). Gel Permeation chromatography experiments indicate that distribution ratios are stongly dependent on the concentration of particles having molecular weights of approximately 50,000. These molecules or particles are probably polymers of humic acid. Particle-size dependent distribution ratios have been obtained for the Ritzville, Burbank, and Fuquay soils. Equations a… more
Date: November 1, 1978
Creator: Sheppard, J.C.; Campbell, M.; Kittrick, J. & Cheng, T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Sensitized photoelectrolysis of water with sunlight. Final report, June 1, 1977-December 31, 1978

Description: A study was made of solar driven water photoelectrolysis cells employing semiconductor electrodes. An extensive review of the literature was undertaken, and the three major problem areas for these devices were identified: corrosion, poor sunlight absorption, and external bias requirement. Although many semiconductors had been tested, none had proven free of all three defects. Two approaches were thus followed for the experimental studies: impurity sensitization of wide band gap stable oxides, a… more
Date: December 1, 1978
Creator: Ghosh, A.K. & Maruska, H.P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Studies of concrete as a host for Savannah River Plant radioactive waste

Description: Formulations of simulated and actual Savannah River Plant high-level radioactive wastes in concrete were prepared and evaluated. Laboratory-scale castings were tested for compressive strength; for leachability of /sup 90/Sr, /sup 137/Cs, and alpha emitters; and for long-term thermal stability. Effects of cement type, waste type, and waste loading were measured. Properties of concrete were found adequate for fixation of these wastes.
Date: January 1, 1978
Creator: Stone, J.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Amchitka Radiobiological Program. Progress report, January 1977--December 1977. [/sup 3/H, /sup 90/Sr, /sup 239/Pu, /sup 240/Pu, /sup 40/K, /sup 7/Be]

Description: The Amchitka Radiobiological Program began in 1970 and is a continuing program to collect biological and environmental samples for radiometric analyses. An account of the program from July 1970, to December 1976, has been given in seven previous progress reports from the Laboratory of Radiation Ecology to the Nevada Operations Office of the U.S. Department of Energy. This report is an account of the program for calendar year 1977. Results of analyses for samples collected in September 1977 have… more
Date: July 1, 1978
Creator: Seymour, A.H. & Johnson, A.F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of concrete as a matrix for solidification of Savannah River Plant waste

Description: Some of the favorable and unfavorable characteristics of concrete as a matrix for solidification of SRP waste, as found in this study, are listed. Compressive strength and leachability of waste forms containing /sup 90/Sr and alpha emitters are very good. The waste forms have reasonable long-term thermal stability up to 400/sup 0/C, although water is evolved above 100/sup 0/C. Long-term radiation stability of the solid, as measured by strength and leachability, is excellent. For the unfavorable… more
Date: January 1, 1978
Creator: Stone, J.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Bibliography on Cycling of Trace Metals in Freshwater Ecosystems

Description: This bibliography is a listing of pertinent literature directly addressing the cycling of trace metals in freshwater ecosystems. Data on cycling, including the influences of environmental mediators, are included. 151 references.
Date: July 1, 1978
Creator: LaRiviere, M. G.; Scott, A. J.; Woodfield, W. G. & Cushing, C. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Leaching of fully radioactive high-level waste glass

Description: As part of continuing Department of Energy (DOE)-sponsored studies in waste management, the Pacific Northwest Laboratory (PNL) has been conducting the High-Level Waste Immobilization Program. The purpose of this program is to develop and demonstrate technology for incorporating nuclear wastes into final waste forms. The preparation and leach testing of fully radioactive, zinc borosilicate glass, which was prepared from power reactor waste, are described. Leach testing using the International At… more
Date: September 1, 1978
Creator: Bradley, D.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Sorption--desorption studies of Nevada Test Site alluvium and leaching studies of nuclear test debris

Description: Distribution coefficients were determined for sorption-desorption of radioactive tracers between Nevada Test Site alluvium and alluvial ground water. The order of increasing distribution coefficient by element is: Sb, Sr, U(VI), I, Ru, Nb, Ba, Cs, Co, Y, Ce, and Eu. Some distribution data were also obtained for bentonite. Volatile and refractory debris samples from nuclear tests in tuff, alluvium, and rhyolite were leached with ground water. Most leachable are the volatile species I, Mo, and Sb… more
Date: April 1, 1978
Creator: Wolfsberg, Kurt
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Use of titanates in decontamination of defense waste

Description: Sodium titanate, an inorganic ion exchange material, has been evaluated for use in a process to remove strontium from Defense Waste or other high-sodium, caustic solutions. Distribution coefficients on the order of 10/sup 5/ were observed at sub part per million concentrations of Sr, and the effects of other cation impurities and complexants in the waste were investigated. The preparation and general chemical properties of the exchange material are discussed. This information was used in develo… more
Date: June 1, 1978
Creator: Dosch, R.G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Quarterly report on the strontium heat source development program, Advanced Systems and Materials Production Division for April--June 1978

Description: All of the remaining compatibility tests are proceeding as scheduled. Results of the 20,000-hr compatibility tests with nonradioactive SrF/sub 2/ show that, with one exception, attack of the specimens by the SrF/sub 2/ after 20,000 hr is no greater than after 6000 and 12,000 hr. The one exception involved Haynes Alloy 25 specimens tested at 1000/sup 0/C. These test specimens exhibited isolated subsurface voids to depths of 0.025 in., although the general surface attack was only about 0.001 inch… more
Date: July 1, 1978
Creator: Fullam, H. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Sequim Marine Research Laboratory routine environmental measurements during CY-1977

Description: Beginning in 1976, a routine environmental program was established at the Marine Research Laboratory (MRL) at Sequim, Washington. The program is intended to demonstrate the negligible impact of current MRL operations on the surrounding environs and to provide baseline data through which any cumulative impact could be detected. The sampling frequency is greater during the first 2 years of the program to provide sufficient initial information to allow reliable estimates of observed radionuclide c… more
Date: June 1, 1978
Creator: Fix, J. J. & Blumer, P. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Fission Product Holdup in Graphite. [HTGR]

Description: Multicomponent time-dependent concentration diffusion and radioactive decay of isotopic species is an important aspect of fission product migration and release from fuel particles and fuel elements in a High Temperature Gas-Cooled Reactor (HTGR). After fission products escape from a fuel particle in an HTGR, it is still necessary for them to diffuse across the graphite web of a fuel block to a coolant hole before they can be entrained in the primary coolant. The time required for a given fissio… more
Date: January 1, 1978
Creator: Apperson, C., (Jr.); Carruthers, L. M. & Anderson, C. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Hydrothermal reactions of nuclear waste solids. A preliminary study.

Description: A simulated high-level waste glass, Supercalcine, and some common ceramic and metallic solids were exposed to hydrothermal conditions at 250 and 350/sup 0/C for time periods ranging from three days to three weeks. Most of the experiments were done in salt brine, but the glass study did include deionized water tests so that the influence of salt could be better understood. Under the extreme hydrothermal conditions of these tests, all of the materials examined underwent measurable changes. The gl… more
Date: September 1, 1978
Creator: Westsik, J. H. Jr. & Turcotte, R. P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Simulated high-level waste-basalt interaction experiments. Annual progress report, October 1, 1977--September 30, 1978

Description: Reconnaissance experiments suggested that the observed reactivity of calcine and glass as 300/sup 0/C would be anticipated at lower temperatures but only after longer times of hydrothermal treatment. Long-duration experiments at 100/sup 0/ and 300/sup 0/C were initiated to determine the time dependence of the alterations at lower temperatures. The reconnaissance experiments also suggested that equilibrium conditions were not yet achieved in these closed system experiments. Glass was observed to… more
Date: November 1, 1978
Creator: Scheetz, B. E.; Smith, D. K.; Barnes, M. W.; Komarneni, S.; Stull, L. M. & Smith, C. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Animal Investigation Program 1976 annual report: Nevada test site and vicinity. [Radioanalysis of tissues from animals residing on or near NTS in 1976]

Description: Data are presented from the radioanalysis of tissues collected from cattle and mule deer, desert bighorn sheep, feral horses, and other wildlife that resided on or near the Nevada Test Site during 1976. Other than the naturally occurring potassium-40, gamma-emitting radionuclides were detected infrequently with the exception of /sup 131/I in animal thyroid samples collected after September 25 (the date of a Chinese nuclear test). Strontium-90 concentrations in bones from deer, cattle, and deser… more
Date: November 1, 1978
Creator: Smith, D. D.; Giles, K. R.; Bernhardt, D. E. & Brown, K. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Nuclide migration in fractured or porous rock

Description: In the ARDISC model, adsorption and desorption are treated independently. This paper describes an experimental study of the application of the ARDISC model to laboratory studies of nuclide migration in geologic media. Americium and strontium were used in the experiments. Results show that the migration can be treated in at least a semiquantitative fashion, that the ARDISC model is a useful aid, although it is limited to first-order sorption kinetics, and that kinetic parameters may be as import… more
Date: January 1, 1978
Creator: Rickert, P.G.; Strickert, R.G. & Seitz, M.G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Quarterly report on the strontium heat source development program, advanced systems and materials production division for July-September 1978.

Description: Metallographic examination of the specimens from the 12,000-hr tests with /sup 90/SrF/sub 2/ was completed this quarter. The 12,000-hr Hastelloy C-276 specimens exhibited substantially greater attack than did the 6000-hr specimens. The 12,000-hr Haynes 25 and TZM specimens, however, showed no more attack than did the 6000-hr specimens. The 20,000-hr tests with /sup 90/SrF/sub 2/ have also been completed, and arrangements have been made to ship the capsules to Oak Ridge National Laboratory (ORNL… more
Date: December 1, 1978
Creator: Fullam, H. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Measurement of sorption ratios for selected radionuclides on various geologic media

Description: Experiments have been conducted to determine the sorptive characteristics of a variety of rocks and minerals with respect to several radionuclides of interest. This information will be used in the determination of the rates of radionuclide migration from nuclear waste repositories. The R/sub d/ values can be arranged according to the following inequalities: Pu greater than Cs, except for biotite; Cs greater than Sr, except for limestone; Sr greater than Tc. The exceptions are considered signifi… more
Date: September 1, 1978
Creator: MacLean, S. C.; Coles, D. G. & Weed, H. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Economic feasibility of strontium-90 fueled heaters for use in cold regions

Description: This study was conducted to conceptually design and obtain cost estimates for various radioisotope fueled heating systems for use in potential cold regions applications, and to determine the economic feasibility of radioisotope fueled heaters by comparing them to fuel oil systems. The applications have been identified and grouped, according to thermal output: (1) 1 kWt septic tank heaters, well-head heaters, heaters to assist operation of sewage lagoons, and (2) 7 or 12 kWt potable water system… more
Date: February 1, 1978
Creator: Sande, W. E. & Aaberg, R. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Multielement flame emission spectroscopy using a scanning Fabry--Perot interferometer

Description: A system for multielement flame emission analysis based on a scanning Fabry-Perot interferometer is described and evaluated. Detection limits and linearity of response for ten elements commonly determined by flame photometry compare favorably to conventional single-element methods. Analyses for several elements in tap water, serum, urine, NBS SRM 1571 orchard leaves and low alloy steel demonstrate the excellent accuracy and precision of the technique. Resolution of the system allows up to five … more
Date: April 1, 1978
Creator: Korba, G.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Annual report on the Characterization on the high-level waste glasses.

Description: The waste compo itions PW-7c and PW-9 were defined and glass development was completed. Major variations in major oxide concentration would not grossly affect the leach rates of the glass. Impact and strength tests on nonradioactive glass showed that the waste glasses produced slightly less fine particulate than commercial glass. Waste glass had 60% of the strength of the soda-lime glass. A water-quench reduced thermal conductivity about 20%, and a 24-h hold at devitrification temperatures did … more
Date: June 1, 1978
Creator: Ross, W.A.; Bradley, D.J. & Bunnell, L.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Solid phases and solution species of different elements in geologic environments

Description: An investigation was conducted to predict from thermodynamic data the nature of the solid phases and solution species in various weathering environments of different elements (Am, Sb, Ce, Cs, Co, Cm, Eu, I, Np, Pu, Pm, Ra, Ru, Sr, Tc, T, U, and Zr) that are present in radioactive wastes, to predict the degree of adsorption of different elements by the solid matrices and to compare these predictions with observed results, and to determine the influence of different factors (such as Ph, Eh, compl… more
Date: March 1, 1978
Creator: Rai, D. & Serne, R.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Quarterly report on the Strontium Heat Source Development Program, Advanced Systems and Materials Production Division for January--March 1978. [WESF /sup 90/SrF/sub 2/ capsules]

Description: Work has started on a theoretical analysis of the possible consequences of a WESF /sup 90/SrF/sub 2/ capsule rupture in an ocean environment. ORNL has begun work on sectioning the capsules from the 12,000 hr compatibility tests with WESF /sup 90/SrF/sub 2/. Examination of the Haynes Alloy 25 specimens which were exposed to WESF /sup 90/SrF/sub 2/ for 6000 hr has been completed. The 6000-hr specimens suffered much greater attack than the equivalent 1000-hr specimens. The chemical attack mechanis… more
Date: April 1, 1978
Creator: Fullam, H. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen