Health Risk of Radiofrequency RadiationToxicological and 课件.pptVIP

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Health Risk of Radiofrequency RadiationToxicological and 课件.ppt

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Health Risk of Radiofrequency RadiationToxicological and Laboratory Studies Riadh W. Y. Habash, PhD, P.Eng McLaughlin Centre for Population Health Risk Assessment, Institute of Population Health School of Information Technology and Engineering University of Ottawa rhabash@site.uottawa.ca 精品文档 The electromagnetic (EM) field is a physical influence (a field) that permeates through all of space, and which arises from electrically charged objects and describes one of the four fundamental forces of nature, electromagnetism. Electromagnetism is found almost everywhere. All EM fields are force fields, carrying energy and capable of producing an action at a distance. These fields have characteristics of both waves and particles. This energy is utilized in various ways, though we still lack the full understanding of its fundamental properties. Many inventions of the late twentieth century, ranging from everyday home and office appliances to satellite systems and mobile phones, are so important and so advantageous; we wonder how we ever lived without them. 精品文档 General EM waves at low frequencies are referred to as EM fields and at very high frequencies are called EM radiation. The term EM field is generally used rather than EM radiation whenever wavelengths greatly exceed distances from exposure sources. EM fields at all frequencies make one of the most common environmental issues, about which there is a growing concern and speculation. EM fields are present everywhere in our environment but are invisible to the human eye. All populations are now exposed to varying degrees of EM fields, and the levels will continue to increase as technological inventions advance. These inventions have become an integral part of our modern life. We just need to know that they are safe. 精品文档 Sources of RF Radiation (100 kHz-300 GHz) Broadcast (AM and FM) and TV (? 0.1 W/m2) Mobile Phones and cordless phones (? 0.1 W/m2) Microwave Ovens (? 0.5 W/m2) Civil and Military Radar Systems P