10. THE ENERGIES OF ELECTROMAGNETIC WAVES (nu-bar) represents wavenumber, the number of wavelengths in 1 cm
11. 4) Characteristics of Waves - wavelength - distance between consecutive peaks - crests - measured in m, nm, angstroms.
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13. Low High ENERGY Radio waves Microwaves Radar Infrared Visible light Ultra-violet X-ray Gamma-ray Non-ionizing radiation Ionizing radiation
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15. frequency - (nu) - number of times per second a crest passes a given point (cycles per second) 1 Hz = 1 cycle per second = 1/sec =sec -1 u = speed = X nm/wave X wave/sec = nm/sec for light - speed of electromagnetic radiation in a vacuum is a constant - c - 2.998 X 10 8 m/sec X = c for light
16. nu is inversely proportional to the wavelength. What does this mean? The range of frequencies or wave lengths is called the electromagnetic spectrum - it ranges from gamma rays to TV, FM, AM radio waves.
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18. Nonionizing Ultraviolet, visible, infrared, microwaves, radio & TV, power transmission Ionizing Radiation capable for producing ions when interacting with matter – x-rays, alpha, beta, gamma, cosmic rays
19. Nonionizing Ultraviolet, visible, infrared, microwaves, radio & TV, power transmission Ionizing Radiation capable for producing ions when interacting with matter – x-rays, alpha, beta, gamma, cosmic rays
37. Ionization Defined Radiation capable for producing ions when interacting with matter – in other words enough energy to remove an electron from an atom. Sources – x-rays, radioactive material produce alpha, beta, and gamma radiation, cosmic rays from the sun and space.
Electromagnetism & EM Waves 05/19/08 Lecture 18
Narrative “ Radiation energy come is several forms that can best be described as waves (light, microwaves, x-rays, gamma-rays, etc.) and particles (alpha particles, beta particles, etc.)” For this talk we will be focusing on “ionizing Radiation” which is the high frequency radiation that haws enough energy to liberate electrons from atoms that it hits. In other words, it creates ions. =================== Additional Info And Notes ================ Graphic taken from Radiation and Life web page of the Uranium Information Centre Melbourne, Australia. (sundress added by my niece)
highlight "IONIZING RADIATION:" When ion pair is created the atom or molecule is biologically active Biological damage can result
Narrative The top picture is the a view of Aurora Borealis from outer space which is just of cosmic radiation interacting with or ionosphere The Orange Glaze used in Fiestaware was made using natural uranium For decades, Lantern Mantels have contained natural Thorium. Thorium is natural radioactive material with a half live of 14 billion years Smoke detectors have man-made Am-241, which is used to detect the presence of smoke. Emphasize: there is no difference between the type of radiation emitted by natural or man-made sources.
1.Discuss what non-ionizing radiation is and explain our current state of knowledge on health effects associated with non-ionizing radiation. 2.Discuss briefly the fact that we have lasers on-site that are sources of non-ionizing radiation.
highlight "IONIZING RADIATION:" When ion pair is created the atom or molecule is biologically active Biological damage can result
![Electromagnetic Waves vs. Particle Radiation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)