The amount of UV light produced by the Sun means that the Earth would not be able to sustain life on dry land if most of that light were not filtered out by the atmosphere. For humans, suntan and sunburn are familiar effects of exposure of the skin to UV light, along with an increased risk of skin cancer. Short-wave ultraviolet light damages DNA and sterilizes surfaces with which it comes into contact. These interactions can involve absorption or adjusting energy states in molecules, but do not necessarily involve heating. Many practical applications, including chemical and biological effects, derive from the way that UV radiation can interact with organic molecules. It is also produced by electric arcs Cherenkov radiation and specialized lights, such as mercury-vapor lamps, tanning lamps, and black lights.Īlthough long-wavelength ultraviolet is not considered an ionizing radiation because its photons lack the energy to ionize atoms, it can cause chemical reactions and causes many substances to glow or fluoresce. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun. Ultraviolet ( UV) is a form of electromagnetic radiation with wavelength shorter than that of visible light, but longer than X-rays. Arc welders must wear eye protection and cover their skin to prevent photokeratitis and serious sunburn. UV radiation is also produced by electric arcs.
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