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Definition

Non Ionizing Radiation Chapter 11 HS 432 Students, please read the chapter focusing on the topics covered in this presentation. Definition. Non-ionizing radiation is a form of electromagnetic radiation. Its effects on the body vary and depend largely on the wavelength of the radiation.

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Definition

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  1. Non Ionizing RadiationChapter 11HS 432Students, please read the chapter focusing on the topics covered in this presentation

  2. Definition Non-ionizing radiation is a form of electromagnetic radiation. Its effects on the body vary and depend largely on the wavelength of the radiation. It includes: UV rays, visible light, infrared, microwaves, radiofrequencies

  3. Health Effects Health effects depend on: • Wavelength* • Power intensity • Time of exposure Generally, longer wavelengths penetrate deeper in human tissue and may cause greater rise in deeper tissue temperatures than shorter wavelengths. An individual is less aware of the heat from longer wavelengths because of the absorption of these wavelengths beneath the body surface. Exposures of sufficient intensity and time can lead to dramatic increases in body temperature and/or local damage to specific body organs, regardless of wavelength.

  4. Examples • POWERLINE TRANSMISSION • BROADCAST RADIO • SHORT-WAVE RADIO • MICROWAVES (radar, communications, cooking, heating) Effects: • Longer wavelength (low frequency) • May produce general heating of the body. • However, intensity is generally low. • Microwave intensities may be sufficient to cause heating in tissues. • INFRARED RADIATION Effects: • Is of shorter wavelength and does not penetrate below the skin. • Can only damage the skin and organs right underneath. • Can damage the eyes.

  5. Examples 6. VISIBLE RADIATION – affects quality and accuracy of work 7. ULTRAVIOLET RADIATION Sources: • Electric arcs/ welding • Germicidal lamps • Fluorescent lamps??? • Direct sunlight Effects: • Skin burn

  6. Examples • Laser Characteristics: • Light amplification by stimulated emission of radiation • Is a beam of coherent radiation of a single wavelength and frequency • The light waves travel parallel to each other & in the same direction • Atoms are pumped full of energy and give off energy as they fall to lower energy levels Effects: • The eye is the most vulnerable to injury by laser because the cornea and lens focus the parallel laser on a small spot of the retina. • Infrared radiation of some lasers is not visible and poses more of a potential hazard

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