Download or read book Sources Speciation and Mobility of Plutonium and Other Transuranics in the Groundwater at the Savannah River Site written by Ken O. Buesseler and published by . This book was released on 2003 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: This annual report summarizes work to date on our EMSP project: Sources, Speciation and Mobility of Plutonium and Other Transuranics in the Groundwater at the Savannah River Site? (Sept. 2003-Sept. 2006 SIGNIFICANCE TO DOE EMSP Migration of plutonium in the environment is a major issue at several DOE sites (Riley and Zachara, 1992)). As such, fundamental data concerning the interactions between various chemical forms of plutonium with compounds in the environment are essential for predicting Pu's behavior in the aqueous environment. Our research has focused on two important DOE sites, namely the Savannah River Site and the Hanford Site, and at both sites we see no need to invoke colloid facilitated transport to explain Pu groundwater distributions. This conclusion has important practical implications because much of the uncertainty associated with Pu subsurface transport, including at the Hanford Site (Mann et al. 1998) and the SRS (McDowell et al., 2000) is attributed directly to the uncertainty associated with the role that mobile colloids may or may not play in transporting Pu.
Download or read book Sources Speciation and Mobility of Plutonium and Other Transuranics in the Groudwarter at the Savannah River Site written by Ken O. Buesseler and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This annual report summarizes work to date on our EMSP project:?Sources, Speciation and Mobility of Plutonium and Other Transuranics in the Groundwater at the Savannah River Site (Sept. 2003-Sept. 2006). Our research focus is to further evaluate the sources and fate of Pu and other transuranics in groundwater at the Savannah River Site (SRS). Our overarching goal is to understand Pu speciation and mobility well enough to support safe remediation, containment and long term stewardship at any site with transuranic wastes and sources. Methods developed under prior funding for the determination Pu isotopes, oxidation state and size fractionation in groundwater are providing the best direct evidence for rejecting or not, hypotheses concerning whether colloids enhance the transport of Pu and other transuranics in groundwater. Survey samples collected in the fall of 2003 from F-area well FSB 78 had a 240/239 Pu atom ratio 7.087 +/-0.048 and reflects the continued presences of decayed 244Cm. In October 2004, we returned to the F-area and completed comprehensive field sampling of 7 wells. Field experiments included 6 different extraction rates at well 92D to test sensitivity to artifacts related to well pumping rates, and an aging experiment to evaluate Pu behavior by re-oxidation of reducing groundwater. Sampling of Pond B was included in the site visit to explore unique conditions of redox potential on Pu within the pond. To date, more than 70 Pu redox and whole water samples have been processed and are awaiting analysis at PNNL. Also, five samples from our 1998 visit are undergoing chemistry at PNNL to directly measure Cm with analysis of 2004 samples to follow. Work is continuing to evaluate particle affinity under controlled conditions and a site specific groundwater transport model which we will apply to our lab and field data to obtain a better understanding of the importance of these processes on Pu transport.
Download or read book Sources Speciation and Mobility of Plutonium and Other Transuranics in the Groundwater at the Savannah River Site Sept 2003 Sept 2006 written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The intent of this research effort is to: (1) provide the basis for accurate modeling and prediction of actinide transport; (2) allow for remediation strategies to be planned that might use in-situ manipulations of geochemical variables to enhance (for extraction) or retard (for immobilization) Pu mobility in the groundwater zone; (3) identify specific Pu sources and the extent of far field, or long-term migration of transuranics in groundwater; (4) reduce costly uncertainty in performance and risk assessment calculations. This new knowledge is essential to ensure continued public and worker safety at the DOE sites and the efficient management of cleanup and containment strategies.
Download or read book New Horizons of Human Movement written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Speciation of Plutonium and Americium in Ground Waters from the Radioactive Waste Management Complex Idaho National Engineering Laboratory Idaho written by Jesse M. Cleveland and published by . This book was released on 1993 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book F Canyon Plutonium Solutions Savannah River Site Aiken County Barnwell County written by and published by . This book was released on 1994 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Assessment of Plutonium in the Savannah River Site Environment Revision 1 written by and published by . This book was released on 1992 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plutonium in the Savannah River Site Environment is published as a part of the Radiological Assessment Program (RAP). It is the fifth in a series of eight documents on individual radioisotopes released to the environment as a result of Savannah River Site (SRS) operations. These are living documents, each to be revised and updated on a two-year schedule. This document describes the sources of plutonium in the environment, its release from SRS, environmental transport and ecological concentration of plutonium, and the radiological impact of SRS releases to the environment. Plutonium exists in the environment as a result of above-ground nuclear weapons tests, the Chernobyl accident, the destruction of satellite SNAP 9-A, plane crashes involving nuclear weapons, and small releases from reactors and reprocessing plants. Plutonium has been produced at SRS during the operation of five production reactors and released in small quantities during the processing of fuel and targets in chemical separations facilities. Approximately 0.6 Ci of plutonium was released into streams and about 12 Ci was released to seepage basins, where it was tightly bound by clay in the soil. A smaller quantity, about 3.8 Ci, was released to the atmosphere. Virtually all releases have occurred in F- and H-Area separation facilities. Plutonium concentration and transport mechanisms for the atmosphere, surface water, and ground water releases have been extensively studied by Savannah River Technology Center (SRTC) and ecological mechanisms have been studied by Savannah River Ecology Laboratory (SREL). The overall radiological impact of SRS releases to the offsite maximum individual can be characterized by a total dose of 15 mrem (atmospheric) and 0.18 mrem (liquid), compared with the dose of 12,960 mrem from non-SRS sources during the same period of time (1954--1989). Plutonium releases from SRS facilities have resulted in a negligible impact to the environment and the population it supports.
Download or read book Chemical Speciation of Plutonium in the Radioactive Waste Burial Ground at the Savannah River Plant written by E. L. Wilhite and published by . This book was released on 1978 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measured Solubilities and Speciations of Neptunium Plutonium and Americium in a Typical Groundwater J 13 from the Yucca Mountain Region Milestone Report 3010 WBS 1 2 3 4 1 3 1 written by Heino Nitsche and published by . This book was released on 1993 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book SUBSURFACE MOBILE PLUTONIUM SPECIATION written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A recent review found several conflicting conclusions regarding colloid-facilitated transport of radionuclides in groundwater and noted that colloids can both facilitate and retard transport. Given these contrasting conclusions and the profound implications even trace concentrations of plutonium (Pu) have on the calculated risk posed to human health, it is important that the methodology used to sample groundwater colloids be free of artifacts. The objective of this study was: (1) to conduct a field study and measure Pu speciation, (239Pu and 24°Pu for reduced-Pu{sub aq}, oxidized-Pu{sub aq}, reduced-Pu{sub colloid}, and oxidized-Pu{sub colloid}), in a Savannah River Site (SRS) aquifer along a pH gradient in F-Area, (2) to determine the impact of pumping rate on Pu concentration, Pu speciation, and Pu isotopic ratios, (3) determine the impact of delayed sample processing (as opposed to processing directly from the well).
Download or read book Plutonium Speciation Solubilization And Migration in Soils written by and published by . This book was released on 2000 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The DOE is currently conducting cleanup activities at its nuclear weapons development sites, many of which have accumulated plutonium (Pu) in soils for 50 years. To properly control Pu migration within Federal areas and onto public lands, to better evaluate the public risk, and to design effective remediation strategies, a fundamental understanding of Pu speciation and environmental transport is needed. Our goal is to use characterization, mobility, thermodynamic, and mineral-interaction data to develop better models of radionuclide transport and risk assessment which will enable the development of science-based decontamination strategies. In addition, if direct characterization of Pu in samples from a contaminated site reveal that the Pu is predominantly in an exceedingly low soluble, low mobility form, then acceptable, reasonable limits for site remediation and closure can be set in a directly defensible manner. Our overarching research approach has the following three interrelated facets: characterization of Pu in samples from a contaminated site; fundamental study of environmentally-relevant Pu species; and thermodynamic geochemical modeling of PU speciation and mobility. This approach differs from those of most other projects funded at a similar level because of its very broad scope and the range of specific methods and techniques used in the research. While one can argue that our approach is overly ambitious, it is absolutely mandated by the state of actinide environmental science. Unlike most other contaminant metals, the knowledge on Pu within each of these subfields is woefully inadequate to support site remediation and stewardship. There are also clear transition paths for each type of information, i.e. site characterization results can be used by owners and stake holders to better understand their contamination problems and remediation issues; fundamental data on Pu species can fill important gaps in existing geochemical databases; thermodynamic modeling using improved data and better defined site conditions can be used to predict long-term contaminant behavior and can suggest particular Pu species for further study. Within this context, the specific tasks described in our original proposal are the following: l Site Characterization. The total plutonium content in soils surrounding the Rocky Flats Environmental Technology Site (RFETS) had been thoroughly characterized previously; however, less work has been done to separate plutonium in these soils into its sources (site activities at Rocky Flats or global fallout) and no work has successfully determined the speciation of the plutonium. Personnel at the site supported this effort by providing information, samples, and mechanisms to disseminate our results. Task 1--Characterize the plutonium in soils and groundwaters from the RFETS site, determining both the speciation, including concentration, isotopic ratio (239/240), oxidation state and specific chemical form, and the distribution, from a microscopic level (particle size, association with other elements) to a macroscopic level (depth in soil, location). To our knowledge, characterization with this level of detail has never been done for an environmental plutonium sample. Task 2--Communicate these results to the site to assist in site management, remediation, and stewardship.
Download or read book Mobilization of Plutonium IV from Savannah River Site Sediments written by Leo Gumapas and published by . This book was released on 2005 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Speciation and Structural Characterization of Plutonium and Actinide organic Complexes in Surface and Ground Waters Sept 1996 Sept 1999 Speciation Mobility and Fate of Actinides in the Groundwater at the Hanford Site Sept 1999 Sept 2002 written by and published by . This book was released on 2000 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our first project focused on the development and testing of appropriate sampling and analytical techniques to study the association of actinides with dissolved organic complexes in subsurface waters. Our ongoing project is designed for: (1) the determination of the speciation of plutonium and other actinides (Np, U) in groundwater at the 100 and 200 areas at the Hanford Site. This includes the separation of Pu into particulate, colloidal and
Download or read book Speciation and Structural Characterization of Plutonium and Actinide organic Complexes in Surface and Groundwaters 1998 Annual Progress Report written by and published by . This book was released on 1998 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors proposed research is designed to study the association of actinides with dissolved organic complexes in subsurface waters. This study expands considerably on prior work due to the combination of Pu oxidation studies (for Pu speciation/chemical reactivity information), Pu isotope ratio work (for Pu source function information), and the detailed characterization of organic matter in size-fractionated groundwater samples. The authors have postulated that actinide associations with organic matter may be enhanced due to colloidal biopolymers. This report summarizes work completed after less than 2 years of a 3-year project. Activities thus far have included: (1) the development of sampling techniques to minimize contamination and artifact formation, (2) the separation of Pu isotopes by oxidation state in groundwater, (3) the development of techniques for the separation and identification of organic constituents from natural waters, (4) a study of background Pu and organic carbon concentrations at the proposed study sites, and (5) field work at the Savannah River Site (SRS).
Download or read book Sources Distribution and Mobility of Plutonium and Radiocesium in Soils Sediments and Water of the Hudson River Estuary and Watershed written by Paul Linsalata and published by . This book was released on 1984 with total page 802 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plutonium and Neptunium Speciation and Mobility in Soils and the Subsurface written by Mary P. Neu and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The DOE is conducting cleanup and stabilization activities at its nuclear weapons development sites, many of which have accumulated plutonium in soils for 60 years. To properly control Pu migration in soils and groundwaters within Federal sites and onto public lands, better evaluate the public risk, and design effective remediation strategies, a fundamental understanding of Pu speciation and environmental transport is needed. The DOE is increasingly relying on monitored natural attenuation (MNA) for site stewardship. While this is practical, and defensible based on fundamental actinide chemistry and most environmental data, there are significant gaps in the foundation of the approach. Key among them is the inability to project migration rates and redistribution of actinide contaminants, particularly given the diversity and heterogeneity of sites. Matrix sorption/desorption processes are the main factors that determine contaminant transport, but little data of this type are available for Pu or Np with minerals and sediments. To support MNA and predictive geochemical models we conducted the following research: (1) Studied environmentally relevant Pu and Np species. (2) Determined the mechanisms and thermodynamics of interactions of Pu and Np species with Mn and Fe (oxy)hydroxides and with sediments, including actinide sorption/desorption during mineral formation and redox cycling.
Download or read book The Transuranium Elements written by Glenn Theodore Seaborg and published by . This book was released on 1949 with total page 896 pages. Available in PDF, EPUB and Kindle. Book excerpt:
