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Systems that use ultraviolet (UV) light designed to kill, remove, or render inert pathogenic microorganisms present in a closed environment and on hard inanimate surfaces and objects located in that environment (frequently limited to one room). These systems are intended to remove microorganisms from the environment (i.e., most viruses and bacteria, including mycobacteria) and other microbial forms, including spores when using appropriate wavelengths in the UV spectrum. The UV radiation is obtained from dedicated (e.g., low-pressure mercury, pulsed-xenon) lamps that emit radiation in the UV-B and C ranges (e.g., from 200 to 320 nm wavelength); a fixed wavelength of 254 nm is frequently used. The systems are usually automated and include computerized and remote monitoring capabilities. Some systems permit choosing one of several working cycles according to the room disinfection needs. UV environmental disinfection systems are intended for short-term use (e.g., from several minutes to a few hours) in patient rooms, operating rooms, and other healthcare facility closed areas; they are usually used after a terminal cleaning that is performed when a patient is transferred or discharged from a room.
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