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Ultraviolet radiation:

Electromagnetic radiation at wavelengths between 10 and 400 nanometers lying just beyond the highenergy (violet) end of the visiblelight band of the solar spectrum; about 5% of the radiation the Earth receives from the sun, much of which is absorbed by the atmosphere. UVA = 315 to 400 nanometers wavelength; UVB = 280 to 315 nanometers; UV

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