Xem 1-20 trên 74 kết quả Radiation exposure
  • The National Council on Radiation Protection and Measurements (NCRP) published Report No. 48, Radiation Protection for Medical and Allied Health Personnel in 1976. Many changes in medical practice and procedures involving ionizing radiation have occurred in the intervening 13 years. As a result, the Council determined to prepare this new report to supersede NCRP Report No. 48. The primary objective of this new report is to update the material to include new radiation sources used in medicine.

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  • Preface This is the second National Council on Radiation Protection and Measurements (NCRP) report that provides radiation protection guidance for astronauts working in low-earth orbit. The guidance in this Report supercedes the radiation exposure limit recommendations provided in NCRP Report No. 98 that was published in 1989. Readers may find some of the radiobiological information in Report No. 98 to continue to be relevant and of interest and, therefore, Report No. 98 will continue to be available from NCRP Publications.

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  • Tuyển tập các báo cáo nghiên cứu khoa học quốc tế về bệnh thú y đề tài: Frequencies of Micronuclei in Peripheral Lymphocytes in Korean Populations after Chronic Low-dose Radiation Exposure

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  • The NCRP has long mcog&ed the need for a clear assessment of the magnitude of doses from various souroes of radiation to which the population of the U.S. is ocpo9ed. In anticipation of the need to gather data for input into this process five as&sament committees, each adhing a different source category, wem established, first in 1971 and then reestablished in 1986. NCRP reports assessing exposum from natural background, consumer products, and nuclear power gene ation have recently been published (NCRP, 1987% 1987b. 1987~)...

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  • Radiology is an essential component of dental diagnosis. Available data clearly show that ionizing radiation, if delivered in sufficient doses, may produce biological damage. However, it is not clear that radiation in doses required for dental radiography presents any risk. Neither is it clear that these small doses are free of risk.

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  • The NCRP has long recognized the need for a clear assessment of the magnitude of doses from various sources of radiation to which the population of the U.S. is exposed. In anticipation of the need to gather data for input into this process, five assessment committees, each addressing a different source category, were established. NCRP reports assessing exposures from natural background, consumer products, nuclear power generation, and diagnostic medical radiation have been published (NCRP, 1987a,b,c,d, NCRP, 1989)....

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  • The National Council on Radiation Protection and Measurements (NCRP) was requested by the US Department of Energy (DOE) to review the literature on the effects of radiation on aquatic organisms and develop a document that reviews the present understanding of such effects and provides guidance for a standard for the protection of populations of aquatic organisms.

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  • In recent years, awareness of the vulnerability of the environment has increased, as evidenced by new and developing international policies for environmental protection, starting with the Rio Declaration of 1992. In the context of ionizing radiation, the existing international approach is largely based on providing for the protection of humans, but this is being critically reviewed in several international fora.

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  • Computed tomography (CT) is the mainstay of cancer imaging outside of the central nervous system. Advances in multidetector CT (MDCT) technology have had a profound impact on its diagnostic capabilities. Such techniques as multiphase, single breath-hold imaging, CT angiography (CTA), volume rendering and virtual colonography owe their success to the development of multidetector arrays with continuously moving gantries.

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  • As even these preliminary comments should indicate, Hollywood has experienced a rich and dynamic history. The aim of this chapter is to chart that history in more detail and also to trace the efforts of film crit- ics and scholars to make sense of it. Journalistic film criticism dates back to Hollywood’s earliest years, and the film industry always has been subject to heavy coverage in both the trade and popular press. But the systematic scholarly study of Hollywood did not really take hold, interestingly enough, until after Hollywood’s postwar collapse.

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  • Encourage participants to discuss the differences between the original phrase and the fi nal one. Ask participants to examine how misunderstandings occur through gossip and the spreading of rumors. Suggest a positive behavior or action in order to deal with rumors (i.e. try to talk with the person who is spreading the rumor; talk to friend about how you are feeling; if the rumor involves someone else, discuss it with that person; keep yourself grounded by remembering it is just a rumor and will probably fade from people’s memory and become less important to people)....

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  • Ageing of the population is a major phenomenon in the present day world as a result of the changing demographic transition. Though the phenomenon has a universal character, it occurs in various countries at different point of time. The ageing is a phenomenon already occurred in the developed countries in the latter half of the twentieth century. The similar situation is emerging in the developing countries in the recent periods. Although the proportion of elderly in the years 60 and above is considered to be relatively low in the case of the developing countries such as India and...

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  • Several attempts have been made to analyze the impacts of air pollution on wildlife . More recently, research for WWF has assessed the impacts on wildlife through a literature survey which identified effects on 1,300 species, including 11 mammals, 29 birds, 10 amphibians, 398 higher plants, 305 fungi, 238 lichens and 65 invertebrates, providing the most detailed survey to date 7 . In general, the studies have concentrated on either specific ecosystems, or individual groups of plants and animals.

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  • The U.S. trade deficit, especially with China, spurs heated policy debates and occasional rallying cries to “Buy American.” Heightened debate initially began with the passage of the North American Free Trade Agreement (NAFTA) and continues in most attempts to imple- ment subsequent free trade agreements. However, the problem of “Competition from Im- ported Products” continues to be a low priority issue for most small-business owners as it ranks near the bottom at 68th , two positions lower than in 2008. This problem though varies greatly in importance by industry.

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  • Open car-sharing organizations in Sweden today have some 2000 members and have about 200 cars at their disposal. It has been estimated that approximately 870,000 households could be incorporated into such organizations. If large-scale use of car-sharing is to be achieved during the next 10 years, encompassing say 10 % of the potential, the systematic recruitment of members to existing pools, particularly in large cities, will be needed.

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  • Stroke involves cerebral infarction and hemorrhaging and is associated with very high mortality. Previous reports have indicated that ischemic stimulation such as the reoxygenation that occurs after hypoxia produces a large quantity of reactive oxygen species (ROS) that strongly induces neuronal death in vivo and in vitro (Negishi et al., 2001). Indeed, this is considered to be the factor that most strongly induces cell death in cerebral ischemia. In recent years, apoptosis has been suggested to be the mechanism responsible for ischemic neuronal death in animal stroke models (Tagami et al.

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  • A mutual fund is a type of investment fund. An investment fund is a collection of investments, such as stocks, bonds or other funds. Unlike most other types of investment funds, mutual funds are “open-ended,” which means as more people invest, the fund issues new units or shares. A mutual fund typically focuses on specific types of investments. For example, a fund may invest mainly in government bonds, stocks from large companies or stocks from certain countries. Some funds may invest in a mix of stocks and bonds, or other mutual funds....

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  • This Report addresses in considerable detail the consequences of hot particles on and near the skin, in the eye, ear, respiratory system, and gastrointestinal tract. Limits for exposures from hot particles are recommended. If exposures are maintained below the recommended limits, few, if any, deterministic biological effects are expected to be observed, and those effects would be transient in nature. If effects from a hot-particle exposure are observed, the result is an easily treated medical condition involving an extraordinarily small stochastic risk.

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  • Socioeconomic status, poverty, and race have been found to be correlated with ACSC rates [8-10]. Several studies have examined the associations between ACSCs and demographics using small areas of analysis (typically ZIP code) and have found that ACSCs are higher in lowincome areas and areas with higher concentrations of racial and ethnic minorities [11,12]. The elderly population has not been studied much in this context, because they are thought to be relatively well-insured.

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  • Consumers have only partial knowledge before making a purchase decision, but can choose to acquire more-detailed information. A …rm can make it easier or harder for these consumers to obtain such information. We explore consumers’information gathering and the …rm’s inte- grated strategy for marketing, pricing, and investment in ensuring quality. In particular, we highlight that when consumers are ex-ante heterogeneous, the …rm might choose an intermedi- ate marketing strategy for two quite di¤erent reasons.

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