Give two sources of Ultra violet radiation.
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Sunlight is the main source of UV radiation, even though UV rays make up only a small portion of the sun's rays. Different types of UV rays reach the ground in different amounts. About 95% of the UV rays from the sun that reach the ground are UVA rays, with the remaining 5% being UVB rays.
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Sunlight is the greatest source of UV radiation. Man-made ultraviolet sources include several types of UV lamps, arc welding, and mercury vapour lamps.
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