UVA rays make up as much as 95% of the UV radiation that penetrates the ozone layer and reaches the Earth’s surface. UVA rays are prevalent year round, at all times of day (sun or cloud) and can even penetrate untreated glass, like your car windows. Tanning booths (which we recommend avoiding altogether) also use UVA radiation. walking down a cement sidewalk. shoveling or playing in snow. It’s true that clouds do block some UV light. But more than 90% of the sun’s UV radiation can still pass through clouds on lightly A: The amount of UV protection that sunglasses provide cannot be determined by the color of the lenses, the country of origin or the price of the eyewear. The determining factor is the lens material and any additional UV-blocking coatings that may be applied. Uncoated plastic sunglass lenses block about 88 percent UV; polycarbonate lenses block While plastic and glass lenses absorb some UV light, adding a special chemical to the lens can improve this absorption and provide your eyes with increased UV protection. UV protective coatings can often be added to the backside of a lens. When shopping for sunglasses, look for ones that have a label stating they block 99-100% of UV light. Myth #2: A beach umbrella blocks the sun. Reality: It’s not foolproof. Sand reflects 17 percent of UV radiation, so you’re still exposed, says Dr. Weinstock. One such product is ScotchTint by the 3M Corporation. With this window film, blocking radiation is as simple as having one professional installation done to the windows of your home or office. ScotchTint blocks 90 to 95 percent of EMF/RF radiation and is also energy efficient, meaning it will also help to lower your heating and cooling bills. A black light is a lamp that emits ultraviolet light. Black lights also are known as ultraviolet lamps, UV-A light, and Wood's lamp. The name "Wood's lamp" honors Robert Williams Wood, the inventor of glass UV filters. Nearly all of the light of good black light should be in the UV portion of the spectrum, with very little visible light. Photographic film responds to ultraviolet radiation but the glass lenses of cameras usually block radiation shorter than 350 nm. Slightly yellow UV-blocking filters are often used for outdoor photography to prevent unwanted bluing and overexposure by UV rays. For photography in the near UV, special filters may be used. Introduction: An evaluation of the ultraviolet (UV) flux incident on the Martian surface is important for a number of issues. UV-induced photolysis of wa-ter changes the chemistry of the soil and atmosphere, inducing its oxidizing nature [e.g., 1]. Alternatively, UV may directly affect surface chemistry by generat-ing silicate defects [2]. UKTR6.

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