define the ultraviolet of the medium
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UV radiation is widely used in industrial processes and in medical and dental practices for a variety of purposes, such as killing bacteria, creating fluorescent effects, curing inks and resins, phototherapy and suntanning. Different UV wavelengths and intensities are used for different purposes
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Medium risk means that the sun is not dangerous, but you should avoid being in direct sunlight for more than 1 to 2 hours. Redness (erythema) will after longer exposition. Burners should apply skin protection factor (SPF) 15 sun screen. All people should wear UV-A+B sun glasses.
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