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Research Program To Investigate The Fundamental Chemistry Of Technetium
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Book Synopsis Research Program to Investigate the Fundamental Chemistry of Technetium by : Carol J. Burns
Download or read book Research Program to Investigate the Fundamental Chemistry of Technetium written by Carol J. Burns and published by . This book was released on 2003 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this research is to increase the knowledge of the fundamental technetium chemistry that is necessary to address challenges to the safe, long-term remediation of high-level waste posed by this element. These challenges may be divided into two categories: unexpected behavior of technetium in high-level waste tanks at the Hanford and Savannah River Sites and the behavior of technetium in waste forms.
Book Synopsis Research Program to Investigate the Fundamental Chemistry of Technetium by :
Download or read book Research Program to Investigate the Fundamental Chemistry of Technetium written by and published by . This book was released on 2004 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: Technetium (99Tc, half-life = 2.13 x 105 years,?-emitter) is one of the radionuclides of major concern for nuclear waste disposal. This concern is due to the long half-life of 99Tc, the ease with which pertechnetate, TcO4−, migrates in the geosphere, difficulties in incorporating technetium into glass waste forms, and the corresponding regulatory considerations. The problem of mobility of pertechnetate in the environment is compounded by the fact that pertechnetate is the thermodynamically stable form of technetium in oxidizing environments. These factors present challenges for the separation and immobilization of technetium. The objective of this research project is to provide new knowledge about the chemical behavior of technetium so that the factors underlying technetium speciation in nuclear waste and in waste forms can be understood and the problems can be addressed. In particular, the behavior of technetium and rhenium in glass will be examined since rhenium is ofte n used as a non-radioactive surrogate to predict the behavior of technetium. In this project, glasses containing both rhenium and technetium will be prepared, so that the behavior of both metals can be compared under identical conditions.
Book Synopsis Research Program to Investigate the Fundamental Chemistry of Technetium by : Ian Pegg
Download or read book Research Program to Investigate the Fundamental Chemistry of Technetium written by Ian Pegg and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Tc and Re glasses were prepared using waste surrogates and glass additives for the Low Activity Waste (LAW) fractions from the Hanford Waste tanks AN-107 and AN-105. The AN 107 waste has a higher organic content than the AN-105 waste and should, therefore, provide more reducing environments during glass synthesis. Tc K-edge and Re LII-edge XANES spectra were measured for this series of glasses that were each prepared under slightly different conditions.
Book Synopsis הקשר בין יציבות לחומרים אנטיביוטיים ובין אלימות אצל חידקי KLEBSIELLA by :
Download or read book הקשר בין יציבות לחומרים אנטיביוטיים ובין אלימות אצל חידקי KLEBSIELLA written by and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stobwasser's Bilderkabinet in Berlin by :
Download or read book Stobwasser's Bilderkabinet in Berlin written by and published by . This book was released on 1986 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Research Program to Investigate the Fundamental Chemistry of Technetium. 1998 Annual Progress Report by :
Download or read book Research Program to Investigate the Fundamental Chemistry of Technetium. 1998 Annual Progress Report written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Technetium ([sup 99]Tc, [beta] emitter, half-life 2.1 x 10[sup 5] years, spA= 1.7 x 10[sup -2] Ci/g) is one of the radionuclides of major concern because of regulatory considerations for radioactive waste disposal. The propensity of Tc as pertechnetate, TcO[sub 4][sup -], to migrate in the geosphere necessitates its safe, long-term immobilization. Technetium is found in the nuclear waste storage tanks at the Hanford and at the Savannah River sites in highly alkaline environments along with multi-molar concentrations of nitrate, nitrite, and Na ions and lesser amounts of organic complexants, phosphate, sulfate chloride, fluoride, and carbonate. It has been assumed that technetium is present in the waste tanks as the pertechnetate ion but a recent study has suggested that at least in part, technetium is present in another form. There is a lack of information on Tc chemistry in oxidation states III-V with simple inorganic (OH[sup -], CO[sub 3][sup 2-], PO[sub 4][sup 3-], SiO[sub 4][sup 4-]) and common organic ligands (EDTA, citrate, oxalate) under alkaline conditions. This is essential information needed for pretreatment schemes, processing, and the assessment of stability of Tc in waste form materials. Further complicating the Tc waste tank chemistry is the added effect of an intense radiation field originating from[sup 137]Cs and[sup 90]Sr. The interactions of the ionizing radiation with water, nitrate, nitrite, and other minor components create highly reactive species that can strongly perturb the oxidation-reduction conditions. The stability of Tc in waste form materials is of paramount importance for long term storage concerns and the solid state chemical properties of many candidate Tc compounds are unknown. There have been few systematic studies of Tc stability in lower valent solids with the exception of TcO[sub 2]. Thus, it is not possible at present to assess the long term stability of many Tc compounds relevant to proposed waste form materials. This experimental research program addresses the characterization of the chemistry of technetium pertinent to the waste tank environment and to various waste forms. The solution and solid state chemistry of this element will be studied in aqueous solutions as a function of pH with the various salts added such as nitrate and nitrite, and as a function of radiation dose. The second part of this program is a search for stable, lower valent Tc materials which may prove useful for waste storage. This report summarizes the results after nine months of a three year project.
Book Synopsis Summaries of the USAEC Basic Research Program in Chemistry by :
Download or read book Summaries of the USAEC Basic Research Program in Chemistry written by and published by . This book was released on 1968 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Research Needs for High-Level Waste Stored in Tanks and Bins at U.S. Department of Energy Sites by : National Research Council
Download or read book Research Needs for High-Level Waste Stored in Tanks and Bins at U.S. Department of Energy Sites written by National Research Council and published by National Academies Press. This book was released on 2001-10-05 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: The United States Department of Energy (DOE) has approximately 400 million liters (100 million gallons) of liquid high-level waste (HLW) stored in underground tanks and approximately 4,000 cubic meters of solid HLW stored in bins. The current DOE estimate of the cost of converting these liquid and solid wastes into stable forms for shipment to a geological repository exceeds $50 billion to be spent over several decades (DOE, 2000). The Committee on Long-Term Research Needs for Radioactive High-Level Waste at Department of Energy Sites was appointed by the National Research Council (NRC) to advise the Environmental Management Science Program (EMSP) on a long-term research agenda addressing the above problems related to HLW stored in tanks and bins at DOE sites.
Book Synopsis Progress and Prospects in the Management of Oxyanion Polluted Aqua Systems by : Nurudeen A. Oladoja
Download or read book Progress and Prospects in the Management of Oxyanion Polluted Aqua Systems written by Nurudeen A. Oladoja and published by Springer Nature. This book was released on 2021-07-01 with total page 403 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a compendium of research efforts and findings on the sources, occurrences, hydrochemistry, and several operating variables that influence the presence of oxyanions in aqua system. The content of this book has been designed to provide an insightful account of an array of innovative technologies for the management of the impacts of oxyanions in water, the progress and drawbacks of these technologies and those that have been effectively deployed to transform oxyanions in water to beneficial species. This book further x-rays global laws and economic policies targeted at effectively curtailing the presence of harmful oxyanions in water, challenges facing these policies, and future perspectives on how best to reduce the level of these harmful oxyanions in water to safe limit. The book is relevant to water professionals, policy makers, academics, and research students.
Book Synopsis Physical Research Program by : United States. Congress. Joint Committee on Atomic Energy
Download or read book Physical Research Program written by United States. Congress. Joint Committee on Atomic Energy and published by . This book was released on 1958 with total page 804 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Summaries of the USAEC Basic Research Program in Chemistry by : U.S. Atomic Energy Commission
Download or read book Summaries of the USAEC Basic Research Program in Chemistry written by U.S. Atomic Energy Commission and published by . This book was released on 1966 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. Congress. Joint Committee on Atomic Energy. Subcommittee on Research and Development Publisher : ISBN 13 : Total Pages :858 pages Book Rating :4.:/5 (319 download)
Book Synopsis Physical Research Program by : United States. Congress. Joint Committee on Atomic Energy. Subcommittee on Research and Development
Download or read book Physical Research Program written by United States. Congress. Joint Committee on Atomic Energy. Subcommittee on Research and Development and published by . This book was released on 1958 with total page 858 pages. Available in PDF, EPUB and Kindle. Book excerpt: Considers the scientific applications of atomic energy research.
Download or read book Research Awards Index written by and published by . This book was released on 1989 with total page 742 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Subject Index of Current Research Grants and Contracts Administered by the National Institute of General Medical Sciences by : National Institute of General Medical Sciences (U.S.)
Download or read book Subject Index of Current Research Grants and Contracts Administered by the National Institute of General Medical Sciences written by National Institute of General Medical Sciences (U.S.) and published by . This book was released on 1975 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Institute of General Medical Sciences (U.S.). Division of Research Grants Publisher : ISBN 13 : Total Pages :346 pages Book Rating :4.3/5 (91 download)
Book Synopsis Subject Index of Current Research Grants and Contracts Administered by the National Institute of General Medical Sciences by : National Institute of General Medical Sciences (U.S.). Division of Research Grants
Download or read book Subject Index of Current Research Grants and Contracts Administered by the National Institute of General Medical Sciences written by National Institute of General Medical Sciences (U.S.). Division of Research Grants and published by . This book was released on 1975 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Biomedical Index to PHS-supported Research by :
Download or read book Biomedical Index to PHS-supported Research written by and published by . This book was released on 1988 with total page 998 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Institutes of Health (U.S.). Division of Research Grants Publisher : ISBN 13 : Total Pages :1212 pages Book Rating :4.3/5 (91 download)
Book Synopsis Research Grants Index by : National Institutes of Health (U.S.). Division of Research Grants
Download or read book Research Grants Index written by National Institutes of Health (U.S.). Division of Research Grants and published by . This book was released on 1975 with total page 1212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
