Word: ultraviolet
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...tanning competitions like the George Hamilton Cocoa Butter Open, Zonker would spend hours under the sun with an old-fashioned reflector. Today, seekers of the perfect tan have an easier time of it: they simply drop by the neighborhood tanning salon, cozy up to a bank of ultraviolet lamps and emerge looking as if they have just returned from Hawaii. "The ordinary person who can't afford a vacation can get a lasting tan for a fraction of the money," says Martin Rothschild, president of Rothschild Sunsystems in Albany. "It used to be just movie stars and captains of industry...
...reason for the growing popularity of tanning salons is an advance in technology. Old-fashioned sunlamps emit strong doses of ultraviolet radiation, which can cause a quick sunburn if one is not careful. New tanning machines, however, block out most of the sunburn-linked beta rays (UVB) in favor of alpha rays (UVA), which promote a more gradual tan. The most popular device for soaking up UVA is a clamshell-like tanning bed. The customer lies down on a Plexiglas surface, closes the lid and relaxes as lights from above and below bake him to a golden brown...
...same long-term dangers caused by overexposure to the sun, including premature aging of the skin and a risk of skin cancer. "There is no such thing as a safe tan," says Darrell Rigel, a dermatologist who teaches at New York University School of Medicine. "The only reason ultraviolet alpha is less bad than beta is that it has less energy. If you intensify the alpha rays to get a tan, the damage is just as great as if you had normal amounts of beta." Some research has also indicated that UVA rays may damage deep blood vessels...
Rapid rotation of star causes a tremendous in crease in the ultraviolet light. X-rays, and gamma radiation it the Sun rotated rapidly in its south, this excess radiation may have had important effects on the youthful Earth's atmosphere...
Moving to expand a whole new field of astronomical research, NASA has announced plans for a satellite that will survey the sky's entire band of extreme ultraviolet (EUV) radiation, just as the Infrared Astronomy Satellite (IRAS) did for the other end of the spectrum...