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in subjects: "Radionuclide Migration"

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Interactions of tailings leachate with local liner materials found at Canonsburg, Pennsylvania.

The mill tailings site at Canonsburg, Pennsylvania is the first mill site to receive remedial action under the Department of Energy's Uranium Mill Tailings Remedial Action Program. Part of this remedial action will require excavating the 53,500 m/sup 3/ (70,000 yd/sup 3/) of tailings on the site having a specific activity exceeding 100 pCi/g, and encapsulating these contaminated tailings in a clay-lined cell. As part of the remedial action effort, Pacific Northwest Laboratory has been studying … more

Date: April 1, 1984

Creator: Dodson, M.E.; Gee, G.W. & Serne, R.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Redox reactions involving chromium, plutonium, and manganese in soils

Plutonium speciation in soils is discussed. Chromium was selected as a model for studying soil Pu. Similarities between Cr and Pu are pointed out, and a hypotheses concerning Pu speciation in soils is presented. Findings from Cr oxidation studies that may be relevant to the problem of Pu oxidation in soils are discussed. (JGB)

Date: January 1, 1979

Creator: Amacher, M.C. & Baker, D.E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Stochastic model of radioiodine transport

A research project has been underway at the Oak Ridge National Laboratory with the objective to evaluate dose assessment models and to determine the uncertainty associated with the model predictions. This has resulted in the application of methods to propagate uncertainties through models. Some techniques and results related to this problem are discussed.

Date: January 1, 1980

Creator: Schwarz, G. & Hoffman, F.O.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Use of principal components analysis and three-dimensional atmospheric-transport models for reactor-consequence evaluation

This work explores the use of principal components analysis coupled to three-dimensional atmospheric transport and dispersion models for evaluating the environmental consequences of reactor accidents. This permits the inclusion of meteorological data from multiple sites and the effects of topography in the consequence evaluation; features not normally included in such analyses. The technique identifies prevailing regional wind patterns and their frequencies for use in the transport and dispersi… more

Date: January 1, 1982

Creator: Gudiksen, P. H.; Walton, J. J.; Alpert, D. J. & Johnson, J. D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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

Evaluation of environmental dosimetry models for applicability to possible radioactive waste repository discharges

This report presents the results of a review of the available codes, for application to the National Waste Terminal Storage (NWTS) Program. Consideration was given to the types of radionuclides which may be of concern, the possible modes of release of these radionuclides and the various pathways by which members of the general public in the vicinity of a terminal storage facility may be exposed to the releases. Results reveal that the types and quantities of radioactive material requiring dispo… more

Date: September 1, 1977

Creator: Mauro, J. J.; Michlewicz, D. & Letizia, A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Relevance of biotic pathways to the long-term regulation of nuclear waste disposal. A report on Tasks 1 and 2 of Phase I. [Shallow land burial]

The purpose of the work reported here was to evaluate the relevance of biotic transport to the assessment of impacts and licensing of low-level waste disposal sites. Available computer models and their recent applications at low-level waste disposal sites are considered. Biotic transport mechanisms and processes for both terrestrial and aquatic systems are presented with examples from existing waste disposal sites. Following a proposed system for ranking radionuclides by their potential for bio… more

Date: July 1, 1982

Creator: McKenzie, D. H.; Cadwell, L. L.; Cushing, C. E. Jr.; Harty, R.; Kennedy, W. E. Jr.; Simmons, M. A. et al.

Item Type: Report

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

Radiochemical analyses of samples from beneath a solid radioactive waste disposal pit at Los Alamos, New Mexico

Solid radioactive wastes are disposed of by burial in pits excavated in rhyolite tuff at the Los Alamos Scientific Laboratory (LASL). Contaminants in the waste include fission products, uranium, and transuranic elements. In 1976, horizontal core holes were drilled beneath a waste disposal pit that was used from 1963 to 1966. Samples of the core were analyzed for gross alpha, gross beta, total uranium, /sup 90/Sr, /sup 137/Cs, /sup 238/Pu, /sup 239/ /sup 240/Pu, and /sup 241/Am. The measured gro… more

Date: June 1, 1980

Creator: Purtymun, W. D.; Rogers, M. A. & Wheeler, M. L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Rapid seepage of contaminants through the highwall of a uranium mill tailings pit. [MIGRAT]

A computer code (MIGRAT) is used to quantify the migration of moisture and multiple retarded contaminants in the unsaturated zone and assess the impact of open mine disposal of uranium mill tailings. The model is applied to a generic uranium mill tailings. The model is applied to a generic uranium mill tailings pit constructed with a clay-lined bottom and steep unlined sidewalls. The migration of a two contaminant system is modeled assuming that neither contaminant decays and only one contamina… more

Date: January 1, 1984

Creator: Pin, F.G.; Witten, A.J.; Sharp, R.D. & Long, E.C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Investigations of the Natural Fission Reactor Program. Progress report, October 1976--September 1977

During Fiscal Year 1977, efforts of the Natural Fission Reactor Program have been directed toward (1) further measurements and predictions of reactor product migration at Oklo, (2) uraninite solubility studies, (3) radiogenic equilibria studies of natural Pu, Ra, and Th in U ores, (4) search for evidence of other natural fission reactors, and (5) supportive analytical measurements and procedures development.

Date: November 1, 1977

Creator: Apt, K.E. (ed.)

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

FEMWATER: a finite-element model of water flow through saturated-unsaturated porous media

Upon examining the Water Movement Through Saturated-Unsaturated Porous Media: A Finite-Element Galerkin Model, it was felt that the model should be modified and expanded. The modification is made in calculating the flow field in a manner consistent with the finite element approach, in evaluating the moisture-content increasing rate within the region of interest, and in numerically computing the nonlinear terms. With these modifications, the flow field is continuous everywhere in the flow regime… more

Date: October 1, 1980

Creator: Yeh, G.T. & Ward, D.S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Proceedings of the Fifth Annual Participants' Information Meeting: DOE Low-Level Waste Management Program

The meeting consisted of the following six sessions: (1) plenary session I; (2) disposal technology; (3) characteristics and treatment of low-level waste; (4) environmental aspects and performance prediction; (5) overall summary sessions; and (6) plenary session II. Fifty two papers of the papers presented were processed for inclusion in the Energy Data Base. (ATT)

Date: December 1, 1983

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

FY 1992 task plans for the Hanford Environmental Dose Reconstruction Project

Phase 1 of the HEDR Project was designed to develop and demonstrate a method for estimating radiation doses people may have received from Hanford Site operations since 1944. The method researchers developed relied on a variety of measured and reconstructed data as input to a modular computer model that generates dose estimates and their uncertainties. As part of Phase 1, researchers used the reconstructed data and computer model to calculate preliminary dose estimates for populations from limit… more

Date: October 1, 1991

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Radiolytic Effects on Ion Exchangers During the Storage of Radioactive Wastes

Radiolytic effects on ion exchangers are being recognized as a significant problem in the processing and storage of high-specific-activity radioactive waste forms. Two major literature surveys and a series of scoping experiments conducted during this investigation indicate that radiation decomposition of ion exchange materials has the potential for a variety of undesirable consequences. These include the ready dispersion of adsorbed radionuclides to the environment, corrosion and pressurization… more

Date: January 1, 1982

Creator: Pillay, K. K. S. & Palau, G. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Surface footprint from initial Chernobyl release as indicated by the meso-alpha MLAM (Multi-Layer Air Mass) model

This document reports the results of dose calculations from the Chernobyl reactor accident in April 1986. The calculations were completed in 1987. The results are now being published to disseminate the information to an audience of potential users. This study's objective was to model the transport path of materials released during April 26 and 27, the first 48 hours of the accident. 5 refs., 15 figs.

Date: December 1, 1989

Creator: Davis, W. E.; Olsen, A. R.; Didier, B. T.; Tucker, P. E. & Damschen, D. W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Evaluation of the radionuclide concentrations in soil and plants from the 1975 terrestrial survey of Bikini and Eneu Islands

In June 1975 a radiological survey was conducted of the terrestrial environment of Bikini and Eneu islands (Bikini Atoll) to evaluate the potential radiation dose to the returning Bikini population. In this report, we present measurements of the radionuclide concentration in soil profiles and in dominant species of edible and nonedible, indicator plants. The use of these data to derive relationships to predict the plant uptake of radionuclides from soil is described. Approximately 620 soil and … more

Date: January 21, 1977

Creator: Colsher, C. S.; Robison, W. L. & Gudiksen, P. H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Study of technetium uptake in vegetation in the vicinity of the Portsmouth Gaseous Diffusion Plant

Technetium-99 was measured in vegetation and soil collected on and near the Portsmouth Gaseous Diffusion Plant to obtain an estimate of the soil-to-vegetation concentration factors. The concentration factors appear to be lognormally distributed with a geometric mean of 3.4 (Bq/kg dry wt. tissue per Bq/kg dry wt. soil) and a geometric standard deviation of 4.7. A dose commitment was calculated using a hypothetical 3.7 x 10/sup 10/ Bq Tc-99/year release and the actual CY-1981 concentration releas… more

Date: January 1, 1982

Creator: Acox, T.A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Transport and transfer rates in the waters of the continental shelf. Annual report

The goal of govern project is to understand and quantify the processes that the transport and dispersal of energy-related pollutants introduced to the waters of the continental shelf and slope. The report is divided into sections dealing with processes associated with suspended solids; processes associated with sediments sinks for radionuclides and other pollutants; and spreading of water characteristics and species in solution. (ACR)

Date: September 1, 1980

Creator: Biscaye, P. E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Residual radioactivity in the vicinity of formerly utilized MED/AEC sites

As demand for uranium and thorium was accelerated during the 1940's, services of chemical and metallurgical firms and major research facilities were contracted as needed by the Manhattan Engineer District (MED). A lack of documentation of the radiological status at the time contracts were terminated at these facilities led the Department of Energy (DOE), and its predecessor the Energy Research and Development Administration (ERDA), to develop a major radiological resurvey program to fill this i… more

Date: January 1, 1980

Creator: Haywood, F. F. & Goldsmith, W. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Steady-state and transient radionuclide transport through penetrations in nuclear waste containers

The transport of radionuclides through penetrations in wastes containers is analyzed. Penetrations may result from corrosion or cracks and may occur in the original container material, in degraded or corroded material, or in deposits of corrosion products. In this report we do not consider how these penetrations occur or the characteristics of expected penetrations in waste containers. We are concerned here only with the analytical formulation and solutions of equations to predict rates of mass… more

Date: July 1, 1986

Creator: Chambre, P. L.; Lee, W. W. L.; Kim, C. L. & Pigford, T. H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Prediction of the migration of several radionuclides in ocean sediment with the computer code IONMIG: a preliminary report

A computer code, IONMIG, which is used to calculate the far-field transport of radionuclides through ocean sediment by diffusion and convection is described. The code uses a two-dimensional, axisymmetric, explicit finite difference formulation. Preliminary results for several species (Cs, Pu, I, Tc) are given.

Date: May 1, 1980

Creator: Russo, A.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Environmental radiation safety: source term modification by soil aerosols. Interim report

The goal of this project is to provide information useful in estimating hazards related to the use of a pure refractory oxide of /sup 238/Pu as a power source in some of the space vehicles to be launched during the next few years. Although the sources are designed and built to withstand re-entry into the earth's atmosphere, and to impact with the earth's surface without releasing any plutonium, the possibility that such an event might produce aerosols composed of soil and /sup 238/PuO/sub 2/ ca… more

Date: August 1, 1980

Creator: Moss, O.R.; Allen, M.D.; Rossignol, E.J. & Cannon, W.C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Low level waste management: a compilation of models and monitoring techniques. Volume 1

In support of the National Low-Level Waste (LLW) Management Research and Development Program being carried out at Oak Ridge National Laboratory, Science Applications, Inc., conducted a survey of models and monitoring techniques associated with the transport of radionuclides and other chemical species from LLW burial sites. As a result of this survey, approximately 350 models were identified. For each model the purpose and a brief description are presented. To the extent possible, a point of con… more

Date: April 1, 1980

Creator: Mosier, J. E.; Fowler, J. R. & Barton, C. J. (comps.)

Item Type: Report

Partner: UNT Libraries Government Documents Department