Portion of the electromagnetic spectrum with wavelengths ranging from approximately 400 nm (nanometers) until 15 nm, just beyond the violet in the visible spectrum. Commonly from the sun or gas discharge lamps. Radiation Ultraviolet He is so energetic, its absorption by atoms and molecules produce joints breaks and formation of ions (photochemical reactions), besides electronic excitation. Prolonged exposure of human skin to ultraviolet radiation predisposes to skin cancer.
Ultraviolet radiation
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