An investigation into the chemical speciation of technetium in the environment PDF Download
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Author: S. Nicholson
Publisher:
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Category :
Languages : en
Pages : 0
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Author: S. Nicholson
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Category :
Languages : en
Pages : 0
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Author: S. T. Sparkes
Publisher:
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Category : Ecology
Languages : en
Pages : 0
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Author: S. T. Sparkes
Publisher:
ISBN: 9780705810296
Category : Ecology
Languages : en
Pages : 30
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Author: G. Desmet
Publisher: Springer Science & Business Media
ISBN: 9400941897
Category : Science
Languages : en
Pages : 416
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Since the discovery of technetium (in 1937, by Perrier and Segre), technetium-99 and technetium-99m have become most familiar in the specialised literature, the behaviour of the former being of concern regarding its health impact, the latter having been used intensively in medical tests for many years. The knowledge of the characteristics and behaviour of this element in nature is currently increasing exponentially. It has become clear, however, that there is still a serious shortage of information needed to assess properly its burden and impact on man and his environment. Technetium may indeed be released from nuclear installations or as a waste product from medical applications. It is generally considered to be highly mobile as the anion TcOi, but it is also suspected to be readily reduced in soils and metabolised in living beings into lower oxidation states. The seminar was planned to analyse thoroughly the experimental results obtained up to now and to make recommendations of specific issues requiring further research. This book presents the papers of the different sessions in the order of presentation, and the conclusions drawn by three discussion groups which dealt separately with: problems of sources and distribution of man-made technetium and its radiological consequences; the chemical behaviour of technetium in different ecosystems; biochemical reactions and binding with macromolecules in various life systems. vi Preface The editors, together with the Programme Committee of the Seminar, wish to express their gratitude to the chairmen of the different sessions for their summary of the group discussions.
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Category : Medicine
Languages : en
Pages :
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Author:
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ISBN:
Category :
Languages : en
Pages : 3
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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.
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Category : Power resources
Languages : en
Pages : 782
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Author: A. M. Ure
Publisher: John Wiley & Sons
ISBN: 140514730X
Category : Science
Languages : en
Pages : 472
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Considerable recent research has focused on the topic of chemical speciation in the environment. It is increasingly realised that the distribution, mobility and biological availability of chemical elements depend not simply on their concentrations but, critically, on the forms in which they occur in natural systems. Continuing developments in analytical chemistry have made speciation practicable even where analytes are present at trace levels (as is often the case in natural samples). In the second edition of this book, the expertise of scientists involved in chemical speciation in various fields have been brought together to provide an overview of the current status of speciation science and indicate how the field may develop in the future.
Author: Klaus Schwochau
Publisher: John Wiley & Sons
ISBN: 3527613374
Category : Science
Languages : en
Pages : 461
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Dieses einzigartige Handbuch gibt eine umfassende Übersicht über den aktuellen Stand der Technetium-Chemie und die Anwendung von Technetium in der Radiopharmazie. Klar und präzise dargestellt werden alle wichtigen Aspekte wie · natürliches und künstlich verursachtes Vorkommen in der Umwelt, · Isotope und Isomere, · Analytische Chemie und Biochemie, · thermodynamische Daten, Stabilität und Reaktivität, · intermetallische und binäre Verbindungen, und vor allem · Komplexchemie sowie · radiopharmazeutischer Einsatz. Dieses herausragende Werk erlaubt sowohl Experten als auch Laien mit naturwissenschaftlicher Bildung einen schnellen Zugang zu wichtiger Information. Deshalb ist das Handbuch genauso unverzichtbar für Forscher an Universitäten und Instituten, in der Nuklearmedizin und radiopharmazeutischen Industrie wie für wissenschaftliche Berater in Regierungen und Umweltverbänden.
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ISBN: 9780795903571
Category :
Languages : en
Pages : 52
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