نتایج جستجو برای: radiological protection
تعداد نتایج: 213057 فیلتر نتایج به سال:
Committee 4 of the International Commission on Radiological Protection (ICRP) is responsible for developing principles, recommendations, and guidance on the protection of people against radiation exposure, and to consider their practical application in all exposure situations. Currently, the Committee's efforts are focused on the completion of a series of future ICRP publications on the impleme...
In the paper it demonstrates that for more precise and comprehensive interpretation under the framework of biospheric concept, the anthropocentric paradigm, being now the one of the basic principles in radiation protection, should be reformulated and amended (an immediate switch to ecological concept involves significant changes and calls for solution of very complicated scientific problems). I...
Until the late thirties, the known effects of radiation were the injuries to the superficial tissues, the changes in the blood and derangement of internal organs. Because of the existence of thresholds for the appearance of these effects the corner stone of radiological protection was the limitation of exposure below a level considered as tolerable to avoid any dangers of over exposure From the...
The biological effects on humans of low-dose and low-dose-rate exposures to ionizing radiation have always been of major interest. The most recent concept as suggested by the International Commission on Radiological Protection (ICRP) is to extrapolate existing epidemiological data at high doses and dose rates down to low doses and low dose rates relevant to radiological protection, using the so...
PURPOSE To review major radiation accidents that have occurred over a 50 year period. To identify common factors, since feedback may prevent recurrence. METHODS Accidents are classified according to the difficulties involved in their management and to the delay between their occurrence and their recognition. RESULTS The rate of severe accidents increases with time, especially those involvin...
A brief review is given of the production and analysis of chromosome aberrations induced by ionizing radiation. The various tissues in which it is possible to demonstrate aberrations are noted and particular emphasis is laid on the culture of peripheral blood lymphocytes. Some examples of recent applications of the technique are described. These are in the determination of suspected overdoses t...
Application of diagnostic X-ray examination to pregnant women is complicated since risks to both mother and embryo/fetus must be considered. Embryos and fetuses are more sensitive to radiation than adults or children. The threshold doses for fetal death, malformations and mental retardation which are deterministic effects, are reported to be 100-200 mGy or higher. The relative risk for childhoo...
1. Gentilini O, Cremonesi M, Trifirò G et al. Safety of sentinel node biopsy in pregnant patients with breast cancer. Ann Oncol 2004; 15: 1348–1351. 2. Morita ET, Chang J, Leong SP. Principles and controversies in lymphoscintigraphy with emphasis on breast cancer. Surg Clin North Am 2000; 80: 1721–1739. 3. Nicklas A, Baker M. Imaging strategies in pregnant cancer patients. Semin Oncol 2000; 27:...
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