Xem 1-20 trên 33 kết quả Ionizing radiation
  • Since the discovery of X rays by Roentgen in 1895, the ionizing radiation has been extensively utilized in a variety of medical and industrial applications. And it has also played crucial roles in development of modern sciences and technologies, as witnessed by more than 60 Nobel Prize winners awarded for achievements in atomic sciences and ionizing radiation-related researches.

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  • Preface This book is intended as a textbook for a course in radiation physics in aca-demic medical physics graduate programs. The book may also be of interestto the large number of professionals, not only physicists, who in their dailyoccupations deal with various aspects of medical physics and have a need toimprove their understanding of radiation physics.Medical physics is a rapidly growing specialty of physics, concerned withthe application of physics to medicine mainly, but not exclusively, in the ap-plication of ionizing radiation to diagnosis and treatment of human disease...

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  • Radiotherapy, also referred to as radiation therapy, radiation oncology or therapeutic radiology, is one of the three principal modalities used in the treatment of malignant disease (cancer), the other two being surgery and chemotherapy.

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  • 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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  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Radiation Oncology cung cấp cho các bạn kiến thức về ngành y đề tài: Ionizing radiation and inhibition of angiogenesis in a spontaneous mammary carcinoma and in a syngenic heterotopic allograft tumor model: a comparative study...

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  • Objectives: To assess the situation of radiation safety, health and illnesss of health workers exposed to ionizing radiation in Thai Nguyen in the year 2012; To analyze the association between radiation safety and health of health workers at health facilities using ionizing radiation in Thai Nguyen; To evaluate the efficacy of some interventions about ensuring radiation safety and health of health workers at health facilities using ionizing radiation in Thai Nguyen.

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  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Radiation Oncology cung cấp cho các bạn kiến thức về ngành y đề tài: MicroRNA expression after ionizing radiation in human endothelial cells...

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  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Radiation Oncology cung cấp cho các bạn kiến thức về ngành y đề tài: The Akt-inhibitor Erufosine induces apoptotic cell death in prostate cancer cells and increases the short term effects of ionizing radiation...

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  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Radiation Oncology cung cấp cho các bạn kiến thức về ngành y đề tài: MicroRNA expression profiles in human cancer cells after ionizing radiation...

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  • Exposure of cells to ionizing radiation induces activation of multiple signal-ing pathways that play a critical role in controlling cell death. However, the basis for linkage between signaling pathways and the cell-death machin-ery in response to ionizing radiation remains unclear.

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  • The promoter of the early growth response gene (Egr-1) has been described to be activated by ionizing radiation, and it seems to be clear that this process involves di€erent mitogen activated protein (MAP) kinases, dependent on the speci®c cell type examined. However, early steps leading to activation of the corresponding pathways and thus to overexpression of Egr-1 are not well understood.

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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 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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  • Atoms, Radiation, and Radiation Protection offers professionals and advanced students a comprehensive coverage of the major concepts that underlie the origins and transport of ionizing radiation in matter. Understanding atomic structure and the physical mechanisms of radiation interactions is the foundation on which much of the current practice of radiological health protection is based.

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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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  • Plants are continuously affected by a variety of environmental factors. Whereas biotic environmental factors are other organisms such as symbionts, parasites, pathogens, herbivores, and competitors, abiotic factors include parameters and resources which determine plant growth like temperature, relative humidity, light, availability of water, mineral nutrients, and CO 2 , as well as wind, ionizing radiation, or pollutants (Schulze et al. 2002 ) . The effect each abiotic factor has on the plant depends on its quantity or intensity.

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  • Science tries to explain a very complicated world. We are surrounded by very many objects, moving around, reacting together, breaking up, joining together, growing and shrinking. And there are many invisible things, too - radio waves, sound, ionizing radiation. If we are to make any sense of all this, we need to simplify it. We use models, in everyday life and in science, as a method of simplifying and making sense of everything we observe. A model is a way of explaining something difficult in terms of something more familiar. For example, there are many models used to describe...

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  • The characteristics lines in X-ray spectra result from electronic transitions between inner atomic orbitals. The X-ray spectra for most heavy elements are much simpler than the UV/Vis spectra observed in ICP-OES, for example. (Only a few lines!!!) Big difference between X-ray and UVVis: The radiation is ionizing, and doesn’t just excite electrons to higher levels. Moseley’s law: Predicts the basic relationship of atom number and the frequency of the characteristic lines

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  • Since its first implementation by Lauterbur [1], Magnetic Resonance Imaging (MRI) has become an important noninvasive imaging modality. MRI has found a number of applications in the fields of biology, engineering, and material science. Because it provides unique contrast between soft tissues (which is generally superior to that of CT) and high spatial resolution, MRI has revolutionized diagnostic imaging in medical science. An important advantage of diagnostic MRI as compared to CT is that the former does not use ionizing radiation....

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  • .MOSFET MODELING FOR VLSI SIMULATION Theory and Practice .International Series on Advances in Solid State Electronics and Technology (ASSET) Founding Editor: Chih-Tang Sah Published: Modern Semiconductor Quantum Physics by Li Ming-Fu Topics in Growth and Device Processing of III-V Semiconductors by Stephen John Pearton, Cammy R. Abernathy & Fan Ren Ionizing Radiation Effects in MOS Oxides by Timothy R. Oldham Forthcoming.

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