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Radiological criteria for determining acceptable remedical actions at radioactively contaminated sites on the Oak Ridge Reservation are presented in this report. The proposed criteria address protection of human health and man's exposure environment but do not address protection of nonhuman biota. In addition, the criteria do not address potential exposures to nonradioactive hazardous chemicals that might be present at contaminated sites; however, as discussed, the protection principles on which the proposed radiological criteria are based could be used to determine acceptable remedial actions for carcinogenic hazardous chemicals. An important rationale for the proposed remedial action criteria is that many of the contaminated sites of concern were used for deliberate disposals of radioactive waste, principally low-level waste, or the sites contain radioactive materials similar in composition and potential hazard to many low-level wastes. Indeed, the basis for this proposal is the notion that remedial actions at radioactively contaminated sites on the Oak Ridge Reservation should achieve risks to human health consistent with current standards for ongoing, permitted disposals of low-level radioactive waste at Oak Ridge and all other United States Department of Energy (DOE) sites.
This publication addresses the remediation of non-urban terrestrial and freshwater ecosystems including agricultural, forest and aquatic environments contaminated with radionuclides by radiation accidents, radiological incidents and other past activities. Associated social, ethical and economic considerations are also presented. The book describes modern decision aiding technologies and environmental decision support systems for remediation planning and optimization. Several case studies, demonstrating remediation success (radiation and radiological accidents, nuclear test sites, etc.) are presented and evaluated. The publication considers only remediation strategies and management options that are relevant for existing exposure situations. Management options (countermeasures) for pre-deposition and early phases after emergencies are the subject of other IAEA publications.
This book offers extensive and comprehensive knowledge to the researchers and academicians who are working on decontamination of radioactively contaminated areas. Remediation strategies for contaminated sites are provided. Readers who will find this book useful include professionals specializing in radioecology, safe disposal of radioactive waste, as well as decontamination, remediation legacies and impact of radioactive waste material on the environment. The chapters give a broad overview and reviews of a number of original publications on remediation strategies that were explored after the Chernobyl and Fukushima Nuclear Power plant accidents. Useful case studies are provided that explore the latest technological developments and future trends for affected area decontamination.
Evaluation of risks to human health from exposure to ionizing radiation at radioactively contaminated sites is an integral part of the decision-making process for determining the need for remediation and selecting remedial actions that may be required. At sites regulated under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), a target risk range of 10−4 to 10−6 incremental cancer incidence over a lifetime is specified by the US Environmental Protection Agency (EPA) as generally acceptable, based on the reasonable maximum exposure to any individual under current and future land use scenarios. Two primary methods currently being used in conducting radiological risk assessments at CERCLA sites are compared in this analysis. Under the first method, the radiation dose equivalent (i.e., Sv or rem) to the receptors of interest over the appropriate period of exposure is estimated and multiplied by a risk factor (cancer risk/Sv). Alternatively, incremental cancer risk can be estimated by combining the EPA's cancer slope factors (previously termed potency factors) for radionuclides with estimates of radionuclide intake by ingestion and inhalation, as well as radionuclide concentrations in soil that contribute to external dose. The comparison of the two methods has demonstrated that resulting estimates of lifetime incremental cancer risk under these different methods may differ significantly, even when all other exposure assumptions are held constant, with the magnitude of the discrepancy depending upon the dominant radionuclides and exposure pathways for the site. The basis for these discrepancies, the advantages and disadvantages of each method, and the significance of the discrepant results for environmental restoration decisions are presented.
A variety of past activities and events have resulted in contamination of sites and areas by residual radioactive material. In cases where relevant criteria are exceeded, remediation should be implemented to reduce radiation exposure due to contamination, taking into account other non-radiological hazards as appropriate. Remediation includes any actions applied to the contamination itself (the source) or to the exposure pathways to people. This Safety Guide provides recommendations on the planning and implementation of remediation of sites and areas affected by past activities and events based on a systematic, stepwise approach, taking account of the specific characteristics of a given situation and the prevailing circumstances. The Safety Guide is targeted at regulatory bodies, responsible parties, operating organizations and other parties involved in the remediation of sites or areas and contributing to the recovery process to ensure the protection of people and the environment.
Naturally occurring radionuclides are found throughout the earth's crust, and they form part of the natural background of radiation to which all humans are exposed. Many human activities-such as mining and milling of ores, extraction of petroleum products, use of groundwater for domestic purposes, and living in houses-alter the natural background of radiation either by moving naturally occurring radionuclides from inaccessible locations to locations where humans are present or by concentrating the radionuclides in the exposure environment. Such alterations of the natural environment can increase, sometimes substantially, radiation exposures of the public. Exposures of the public to naturally occurring radioactive materials (NORM) that result from human activities that alter the natural environment can be subjected to regulatory control, at least to some degree. The regulation of public exposures to such technologically enhanced naturally occurring radioactive materials (TENORM) by the US Environmental Protection Agency (EPA) and other regulatory and advisory organizations is the subject of this study by the National Research Council's Committee on the Evaluation of EPA Guidelines for Exposures to Naturally Occurring Radioactive Materials.
Sites with radioactive contamination may require action to protect people and the environment and to enable transition to a different future use. To support environmental management of these sites, this publication presents a process to determine the “end state” of the site to be remediated or being remediated, and implications for the site future use and necessary controls. The approach is intended to assist those responsible for a site in making an informed and transparent decision on what is the mutually agreed end state. It provides a common basis for all stakeholders involved in the decision-making process, who are working on achieving consensus, so that the potential for misunderstanding is reduced.