EVS 1501 Lecture Notes - Ultraviolet, Electromagnetic Radiation, Electromagnetic Spectrum
7 Feb 2013
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Document Summary
The electromagnetic spectrum is divided into three segments with visible light in. The other two segments are referred to as ionizing and nonionizing, based on their biological activity and span a wide range of wave lengths. The ionizing portion of the spectrum includes gamma rays and ultraviolet radiation. Ionizing radiation is given off by decaying radioisotopes or radionuclide, typically as beta particles or gamma rays. Ionizing radiation is genotoxic and can act as a carcinogens. Nonionizing radiation is not energetic enough to disrupt electrons and hence is not thought to be genotoxic. The radio-frequency range of the nonionizing-radation spectrum can heat tissues. What we know about radiation health effects comes principally from three sources: 1) long-term follow up of the survivors of the atomic bombings in. Hiroshima and nagasaki, which involved an acute exposure to high radiation close at high dose rates. 2) studies of patients receiving diagnostic and therapeutic radiation, also high dose by typically intermittent.
