Ultraviolet cleaning

Ultraviolet cleaning

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Credit: ANDREW BROOKES, NATIONAL PHYSICAL LABORATORY/SCIENCE PHOTO LIBRARY

Caption: Ultraviolet (UV) cleaning. Platinum-iridium kilogram mass prototypes being cleaned with UV light and ozone. First, UV light at a wavelength of 185 nanometres creates ozone, which bonds with hydrocarbon contamination on the metal surface. A second UV wavelength at 250 nanometres then breaks these bonds, releasing the contamination in the form of carbon dioxide. Photographed at the National Physical Laboratory, Teddington, UK.

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Keywords: britain, british, cleaning, cleansing, decontaminating, decontamination, device, england, english, equipment, europe, european, kilogram mass, national physical laboratory, no-one, nobody, o3, ozone, physics, standard, teddington, uk, ultraviolet, united kingdom, uv light, weight

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