246 Matching Results

Search Results

Advanced search parameters have been applied.

in subjects: "Transplutonium Elements"

open access

Organic components of nuclear wastes and their potential for altering radionuclide distribution when released to soil

Normal waste processing at the Hanford operations requires the use of many organic materials, chiefly in the form of complexing agents and diluents. These organic materials and their chemical and radiolytic degradation products, have potential for complexing fission products and transuranium elements, both in the waste streams and upon infiltration into soil, perhaps influencing future sorption or migration of the nuclides. Particular complexation characteristics of various nuclides which const… more

Date: August 1, 1980

Creator: McFadden, K.M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Recovery of plutonium and americium from chloride salt wastes by solvent extraction

Plutonium and americium can be recovered from aqueous waste solutions containing a mixture of HCl and chloride salt wastes by the coupling of two solvent extraction systems: tributyl phosphate (TBP) in tetrachloroethylene (TCE) and octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide (CMPO) in TCE. In the flowsheet developed, the salt wastes are dissolved in HCl, the Pu(III) is oxidized to the IV state with NaClO/sub 2/ and recovered in the TBP-TCE cycle, and the Am is then removed from t… more

Date: January 1, 1987

Creator: Reichley-Yinger, L. & Vandegrift, G.F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Status of the translawrencium elements (Z > 103)

As a result of conflicting claims to the discovery of the trans-lawrencium elements (Z > 103), IUPAC's Inorganic Chemistry Nomenclature Commission, (II.2), has been incapable of coming to a decision on rightful discoverer for these elements. In addition, the Atomic Weights Commission, (II.1), has from time to time been interested in the status of the search for the superheavy elements, i.e., those elements which might be found in the vicinity of the 'island of stability'. Theoretical studies ha… more

Date: January 1, 1985

Creator: Holden, Norman E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Studies of nuclear-waste migration in geologic media. Annual report, November 1976--October 1977

The confinement of nuclear wastes in geologic formations is being considered as a method of permanently disposing of the waste. Laboratory experiments (column infiltration, static absorption, and batch partitioning experiments) were performed with nuclides of Cs, Pu, Np, and Am to examine the migratory characteristics of long-lived radionuclides that could be mobilized by groundwaters infiltrating a nuclear waste repository and the surrounding geologic body. In column infiltration experiments, … more

Date: March 1, 1978

Creator: Seitz, M.G.; Rickert, P.G.; Fried, S.M.; Friedman, A.M. & Steindler, M.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Plutonium, americium, and uranium in blow-sand mounds of safety-shot sites at the Nevada Test Site and the Tonopah Test Range

Blow-sand mounds or miniature sand dunes and mounds created by burrowing activities of animals were investigated by the Nevada Applied Ecology Group (NAEG) to determine the influence of mounds on plutonium, americium, and uranium distributions and inventories in areas of the Nevada Test Site and Tonopah Test Range. Those radioactive elements were added to the environment as a result of safety experiments of nuclear devices. Two studies were conducted. The first was to estimate the vertical dist… more

Date: January 1, 1977

Creator: Essington, E. H.; Gilbert, R. O.; Wireman, D. L.; Brady, D. N. & Fowler, E. B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Application of pressurized ion exchange to separations of transplutonium elements

High-pressure ion exchange chromatography, used first for nucleic acid separations, was applied to the production of the heavier actinides, particularly the transcurium elements. Its use at the TRU plant is described. Future developments are considered briefly. (DLC)

Date: January 1, 1980

Creator: Campbell, D.O.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Isotopic distributions, element ratios, and element mass fractions from enrichment-meter-type gamma-ray measurements of MOX

The gamma-ray spectra from infinitely'' thick mixed oxide samples have been measured. The plutonium isotopics, the U/Pu ratio, the high-Z mass fractions (assuming only plutonium, uranium, and americium), and the low-Z mass fraction (assuming the matrix is only oxygen) can be determined by carefully analyzing the data. The results agree well with the chemical determination of these parameters. 8 refs., 3 figs., 3 tabs.

Date: January 1, 1991

Creator: Close, D. A.; Parker, J. L.; Haycock, D. L. & Dragnev, T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Robotic sample preparation for radiochemical plutonium and americium analyses

A Zymate robotic system has been assembled and programmed to prepare samples for plutonium and americium analyses by radioactivity counting. The system performs two procedures: a simple dilution procedure and a TTA (xylene) extraction of plutonium. To perform the procedures, the robotic system executes 11 unit operations such as weighing, pipetting, mixing, etc. Approximately 150 programs, which require 64 kilobytes of memory, control the system. The system is now being tested with high-purity … more

Date: January 1, 1985

Creator: Stalnaker, N.; Beugelsdijk, T.; Thurston, A. & Quintana, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Table of radioactive elements

As has been the custom in the past, the Commission publishes a table of relative atomic masses and halflives of selected radionuclides. The information contained in this table will enable the user to calculate the atomic weight for radioactive materials with a variety of isotopic compositions. The atomic masses have been taken from the 1984 Atomic Mass Table. Some of the halflives have already been documented.

Date: January 1, 1985

Creator: Holden, Norman E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Extraction and recovery of plutonium and americium from nitric acid waste solutions by the TRUEX process - continuing development studies

This report summarizes the work done to date on the application of the TRUEX solvent extraction process for removing and separately recovering plutonium and americium from a nitric acid waste solution containing these elements, uranium, and a complement of inert metal ions. This simulated waste stream is typical of a raffinate from a tributyl phosphate (TBP)-based solvent extraction process for removing uranium and plutonium from dissolved plutonium-containing metallurgical scrap. The TRUEX pro… more

Date: September 1, 1985

Creator: Leonard, R. A.; Vandegrift, G. F.; Kalina, D. G.; Fischer, D. F.; Bane, R. W.; Burris, L. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Literature review of the concentration ratios of selected radionuclides in freshwater and marine fish

Concentration ratios (CR's) used for modeling the uptake and food chain transport of radionuclides in fish have usually been conservative; that is, at the high end of reported values. This practice ensures that the dose to the consumer of contaminated fish will not be underestimated. In many models, however, conservative values have been used for all variables that have any uncertainty associated with them. As a result the dose to the consumer is overestimated. Realistic CR values need to be de… more

Date: September 1, 1986

Creator: Poston, T. M. & Klopfer, D. C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Environmental studies group. Annual report for 1978

Group projects included radioecological studies of aquatic and terrestrial systems, land management activities, foodstuff monitoring, dust transport studies including fugitive dust measurements and modeling, and several support programs involving evaluation of the plant's ambient air samplers and airborne tritium monitoring techniques. Some salient results from the several project reports include determination of an appropriate model for mechanically generated fugitive dust dispersion, a r… more

Date: August 21, 1980

Creator: Hunt, D. C. & Hurley, J. D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Actinide partitioning and transmutation program. Progress report, July 1--September 30, 1977

In Purex process modifications, two cold runs with mixer-settlers were made on the extraction and stripping of ruthenium and zirconium without the presence of uranium. Efforts in actinide recovery from solids were directed toward the determination of dissolution parameters in various reagents for /sup 241/Am and /sup 239/Pu oxide mixtures, /sup 233/U oxide, /sup 237/Np oxide, /sup 244/Cm oxide, /sup 232/Th oxide, and PuO/sub 2/. Studies in americium-curium recovery with OPIX (oxalate precipitat… more

Date: February 1, 1978

Creator: Tedder, D.W. & Blomeke, J.O. (comps.)

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Fabrication and characterization of MCC approved testing material: ATM-11 glass

ATM-11 glass is designed to be representative of defense high-level waste glasses that will be produced by the Defense Waste Processing Facility at the Savannah River Plant in Aiken, South Carolina. It is representative of a 300-year-old nuclear waste glass and was intended as a conservative compromise between 10-year-old waste and 1000-year-old waste. The feedstock material for this glass was supplied by Savannah River Laboratory, Aiken, SC, as SRL-165 black frit to which was added Ba, Cs, Mo,… more

Date: August 1, 1986

Creator: Wald, J. W. & Daniel, J. L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Quantum mechanical theory of positron production in heavy ion collisions with nuclear contact

The interplay between atomic and nuclear interactions in heavy ion collisions with nuclear contact is studied. The general theoretical description is outlined and analyzed in a number of different limits (semiclassical approximation, DWBA, fully quantal description). The two most important physical mechanisms for generating atomic-nuclear interference, i.e., energy conservation and the introduction of additional phase shifts by nuclear reactions, are extracted. The resulting typical coupling ma… more

Date: January 1, 1986

Creator: Heinz, U.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Secondary recovery of plutonium and americium from process waste streams by solvent extraction

A solvent extraction process is being evaluated for the secondary recovery of plutonium and americium from Rocky Flats waste streams. The bidentate organophosphorus compounds dihexyl-N,N-diethylcarbamylmethylene phosphonate and its dibutyl analogue have been shown to be selective extractants for the actinides from solutions of nitric acid. The results from laboratory test runs in which the organophosphorus extractants were used for processing secondary waste solutions will be presented. Solvent… more

Date: January 16, 1978

Creator: Hagan, P. G. & Navratil, J. D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Influence of humic-acid complexing on the mobility of Americium in the soil aquatic environment

Diffusion data indicate the Am, Cm and Np migrate 1.2, 0.8, and 26 centimeters, respectively, in a thousand years. Thus, excluding mass transport by moving water or wind, actinide elements, such as Cm, Am, and Np that find their way to the soil-aquatic environment are relatively immobile. Measured diffusion coefficients, corrected for distribution between the aqueous and soil phases, tortuosity, negative absorption, and relative fluidity are in reasonable agreement with aqueous diffusion coeffi… more

Date: March 1, 1982

Creator: Sheppard, J.C.; Campbell, M.J. & Kittrick, J.A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Americium purification by a combined anion exchange and bidentate organophosphorus solvent extraction process. [Patent application]

Americium is separated from mixtures containing plutonium, other actinides, and other non-lanthamide impurities, by a combined process of anion exchange resin sorption to remove plutonium, and a bidentate organophosphorus solvent extraction of americium of the anion exchange resin effluent. Dihexyl-N,N-diethylcarbamylmethylenephosphonate is a preferred solvent. The initial mixture may be subjected to a cation exchange operation to remove monovalent impurities. The process is especially effectiv… more

Date: April 10, 1981

Creator: Navratil, J.D. & Martella, L.L.

Item Type: Patent

Partner: UNT Libraries Government Documents Department

open access

Procedure for the analysis of americium in complex matrices

A radioanalytical procedure for the analysis of americium in complex matrices has been developed. Clean separations of americium can be obtained from up to 100 g of sample ash, regardless of the starting material. The ability to analyze large masses of material provides the increased sensitivity necessary to detect americium in many environmental samples. The procedure adequately decontaminates from rare earth elements and natural radioactive nuclides that interfere with the alpha spectrometric… more

Date: February 1, 1978

Creator: Knab, D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Influence of dissolved organic substances in groundwater on sorption behavior of americium and neptunium

Groundwaters typically contain dissolved organic carbon consisting largely of high molecular weight compounds of humic and fulvic acids. To evaluate whether these dissolved organic substances can enhance the tranport of radionuclides through the groundwater system, experiments were conducted to examine the sorption of americium and neptunium onto crushed basalt in the presence of dissolved humic- and fulvic-acid organic carbon introduced into synthetic groundwater. The partitioning experiments … more

Date: January 1, 1984

Creator: Boggs, S. Jr. & Seitz, M.G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Comparative Evaluation of DHDECMP (dihexyl-N,N-diethylcarbamoyl-methylphosphonate) and CMPO (octylphenyl-N,N,-diisobutylcarbamoylmethylphosphine oxide) as Extractants For Recovering Actinides From Nitric Acid Waste Streams

Certain neutral, bifunctional organophosphorous compounds are of special value to the nuclear industry. Dihexyl-N,N-diethylcarbomoylmethylphosphonate (DHDECMP) and octylphenyl-N,N-diisobutylcarbamoylmethylphosphine oxide (CMPO) are highly selective extractants for removing actinide and lanthanide elements from nitric acid. We obtained these two extractants from newly available commercial sources and evaluated them for recovering Am(III), Pu(IV), and U(VI) from nitric acid waste streams of pluto… more

Date: February 1, 1988

Creator: Marsh, S.Fredric & Yarbro, Stephen L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Actinide Partitioning and Transmutation Program. Progress report, April 1--June 30, 1977

Experimental work on the 16 tasks comprising the Actinide Partitioning and Transmutation Program was continued. Summaries of work are given on Purex Process modifications, actinide recovery, Am-Cm recovery, radiation effects on ion exchangers, LMFBR transmutation studies, thermal reactor transmutation studies, fuel cycle studies, and partitioning-transmutation evaluation. (JRD)

Date: October 1, 1977

Creator: Tedder, D. W. & Blomeke, J. O.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Separation of Am-Cm from Al(NO/sub 3/)/sub 3/ waste solutions by in-canyon-tank precipitation as oxalates

A process for recovery of Am-Cm residues from high-activity waste concentrates has been developed specifically for application in Savannah River Plant (SRP) canyon tanks. The Am-Cm residues were collected from a campaign to produce plutonium containing high isotopic concentrations of /sup 242/Pu. The separation of Am-Cm from the high-activity waste stream, containing about 2M Al(NO/sub 3/)/sub 3/, is necessary to produce an acceptable feed solution for a later pressurized cation exchange chroma… more

Date: April 1, 1982

Creator: Gray, L. W.; Burney, G. A.; Wilson, T. W.; McKibben, J. M.; Bibler, N. E.; Holtzscheiter, E. W. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Chemistry research and development. Research and development semiannual progress report, January--June 1977

Results of investigations and developmental activities are reported in chemical research, component research, instrumental and statistical systems, pilot plant research, and process chemistry and instrumentation. (JRD)

Date: October 21, 1977

Creator: Miner, F. J.

Item Type: Report

Partner: UNT Libraries Government Documents Department