Xem 1-20 trên 82 kết quả Radioactivity
  • In 1961 the NCRP issued NCRP Report No. 28, A Manual of Radioactivity Procedures, which was published as the National Bureau of Standards Handbook 80. The report came to be one of the definitive works in the area of radioactivity measurements. As the development of new techniques, procedures, and equipment made parts of the Report obsolescent, the NCRP recognized the need to update and extend the document.

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  • Hazardous and Radioactive Waste Treatment Technologies Handbook .Hazardous and Radioactive Waste Treatment Technologies Handbook Editor-in-Chief Chang Ho Oh, Ph.D. CRC Press Boca Raton London New York Washington, D.C. .Library of Congress Cataloging-in-Publication Data Hazardous and radioactive waste treatment technologies handbook / Chang H. Oh [editor] p. cm. (The mechanical engineering handbook series) Includes bibliographical references and index. ISBN 0-8493-9586-0 (alk. paper) 1. Hazardous wastes--Purification--Handbooks, manuals, etc. 2.

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  • The safe management of nuclear and radioactive wastes is a subject that has recently received considerable recognition due to the huge volume of accumulative wastes and the increased public awareness of the hazards of these wastes. This book aims to cover the practice and research efforts that are currently conducted to deal with the technical difficulties in different radioactive waste management activities and to introduce to the non-technical factors that can affect the management practice.

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  • Liquid waste from Nong Son uranium ore processing is treated with concentrated acid, agglomerated, leached, run through ion exchange and then treated with H2O2 to precipitate yellowcake. The liquid radioactive waste has a pH of 1.86 and a high content of radioactive elements, such as: [U] = 143.898 ppm and [Th] = 7.967 ppm. In addition, this waste contains many polluted chemical elements with high content, such as arsenic, mercury, aluminum, iron, zinc, magnesium, manganese and nickel. The application of the triditional method as one stage...

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  • (BQ) Part 2 book "World of Chemistry" presents the following contents: Gases, liquids and solids, solutions, acids and bases, equilibrium, oxidation–reduction reactions and electrochemistry, radioactivity and nuclear energy, organic chemistry, biochemistry.

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  • Chương này tập trung vào khuôn khổ lập pháp liên bang và các yêu cầu quy định áp dụng đối với điều trị chất thải phóng xạ cũng được chỉ định là chất thải nguy hại theo Bảo tồn tài nguyên và Đạo luật Phục hồi (RCRA) - "hỗn hợp chất thải" Ngoài ra, chương các địa chỉ các chất thải phóng xạ bị ô nhiễm biphenyl đã polyclo hóa (PCBs) quy định theo Đạo luật Kiểm soát các chất độc hại (TSCA) và phóng xạ và độc hại, khắc phục hậu quả có nguồn gốc từ ...

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  • Since the Second World War, and especially since the publication of Rachel Carson’s Silent Spring in 1962, there has been growing concern about contamination of the environment by “man-made” chemicals. These chemicals may be present in industrial and municipal effluents, in consumer or commercial products, in mine tailings, in petroleum products, and in gaseous emissions. Some chemicals such as pesticides may be specifically designed to kill biota present in natural or agricultural ecosystems. They may be organic, inorganic, metallic, or radioactive in nature.

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  • Nuclear power approximately supplies a sixth of the world's electricity and considers as the major source of "carbon-free" energy today. With growing concerns aboutglobal warming, it is not surprising that governments and power providers around the world are considering building a substantial number of additional nuclear power plants. These plants have demonstrated remarkable reliability and efficiency with the help of extensive research work and sharing operational practical experience.

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  • Private landowners or Federal Agencies responsible for cleaning up radiological environments are faced with the challenge of clearly defining the nature and extent of radiological contamination, implementing remedial alternatives, then statistically verifying that cleanup objectives have been met.

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  • AT THE transition to the new millennium the future of nuclear energy looks brighter. Nuclear power plants worldwide have operated safely. Applications for extension of reactor operating licenses in the U.S. are in place and construction is continuing abroad. Uses of isotopes and radiation in applications to medicine, research, and industry continue to assure human benefit. Research and development are active in the areas of controlled fusion, accelerator uses, isotope separation, space exploration, and excess weapons material disposition.

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  • The most widely used analytical separation technique for the qualitative and quantitative determination of chemical mixtures in solution in the pharmaceutical industry is high-performance liquid chromatography (HPLC). However, conventional detectors used to monitor the separation, such as UV, refractive index, fluorescence, and radioactive detectors, provide limited information on the molecular structure of the components of the mixture. Mass spectrometry (MS) and nuclear magnetic resonance (NMR) are the primary analytical techniques that provide structural information on the analytes.

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  • Due to economic growth and increasing population, energy demands must be satisfied in a sustainable manner assuring inherent safety, efficiency and minimized environmental impact. Nuclear power has long posed a dilemma for environmentalists and scientists alike. On the one hand it is seen as a cheap, clean energy source whilst on the other some have concerns over its ability to dispose of radioactive waste.

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  • Gamma rays were discovered by Villard more than a hundred years ago. Rutherford gave the name -rays to the electrically neutral radiation emitted by the naturally occurring radioactive materials. Gamma rays are electromagnetic radiation, photons, which arises due to energy changes in the nucleus. It does not appear as an independent form of radiation, but it follows  and β decay, in those cases when the newly created core of the offspring is found in the excited state.

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  • From the early 1970s to mid-1990s, positron emission tomography (PET) as a diagnostic imaging modality had been for the most part used in experimental research. Clinical PET started only a decade ago. 82Rb-RbCl and 18F-Fluorodeoxyglucose were approved by the U.S. Food and Drug administration in 1989 and 1994, respectively, for clinical PET imaging. Reimbursement by Medicare was approved in 1995 for 82Rb-PET myocardial perfusion imaging and for 18F-FDG PET for various oncologic indications in 1999. Currently several more PET procedures are covered for reimbursement....

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  • In order to predict heavy particle radioactivities in 1980 and to arrive at a unified approach of cluster decay modes, alpha disintegration, and cold fission, before the first experimental confirmation3 in 1984, we developed and used a series of fission theories in a wide range of mass asymmetry, namely: fragmentation theory, numerical (NuSAF) and analytical (ASAF) superasymmetric fission models, and a semiempirical formula for a-decay (see the multiauthored book * and the references therein).

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  • The advancements of the research on Mobile Robots with high degree of autonomy is possible, on one hand, due to its broad perspective of applications and, on other hand, due to the development and reduction of costs on computer, electronic and mechanic systems. Together with the research in Artificial Intelligence and Cognitive Science, this scenario currently enables the proposition of ambitious and complex robotic projects.

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  • Municipal waste consists of everyday items that we use and then throw away, such as product packaging, grass clippings, furniture, clothing, bottles, food scraps, newspapers, appliances, paint, and batteries, which comes from our homes, schools, hospitals, and businesses. Industrial hazardous waste is waste from industrial practices that causes a threat to human or environmental health. As waste generation increases with population expansion and industrialization, waste disposal has become a global challenge for both the developed and developing countries....

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  • The atmosphere may be our most precious resource. Accordingly, the balance between its use and protection is a high priority for our civilization. While many of us would consider air pollution to be an issue that the modern world has resolved to a greater extent, it still appears to have considerable influence on the global environment. In many countries with ambitious economic growth targets the acceptable levels of air pollution have been transgressed. Serious respiratory disease related problems have been identified with both indoor and outdoor pollution throughout the world....

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  • During my career, some 35 years, there has been a growing realization that the goal of successful nuclear waste management and the final disposal of long-lived radionuclides can only be attained by a thorough understanding of the behavior of key, technogenic radionuclides in the environment. Within a nuclear reactor, these radionuclides are created by fission, neutron capture and subsequent beta-decay reactions on actinides, mainly 238 U, and by activation nuclear reactions.

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  • Hỗn hợp chất thải hoạt động thu thập dữ liệu thường được thực hiện đáp ứng một nhu cầu được xác định, chẳng hạn như một nhu cầu thực hiện theo quy định, để chuẩn bị cho vụ kiện tụng, hoặc để thu thập thông tin cho việc ra quyết định.

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