Lethal to microorganisms, ultra-violet radiation in the range of2250 to 3020 Angstroms is usedin a variety of disinfection ap-plications, a process referred to as ultra-violet germicidal irradiation (UVGI). Since the first UVGI system wassuccessfully implemented for disinfect-ing the municipal water system in Mar-Seilles, France, 1in 1909, the disinfec-tion of medical equipment using UVGIhas been a common and reliable prac-Tice. But Unlike water-and equipment-disinfection applications, the disinfec-tion of air streams using UVGI has ahistory of varying success and unpre-dictable performance. The first laboratory studies onUVGI of air in the cottars 1920s showed suchpromise that the elimination of air-borne disease seemed possible. In 1936, Hart used Uvgi to sterilize air in a sur-gical operating room. 2in 1937, the box of Uvgi for a school ven-tilation system dramatically reducedthe incidence of measles, with subse-quent applications enjoying similarsuccess. 3experiments by Riley Ando'grady 4resulted in the elimination oftuberculosis (TB) Bacilli from hospital-ward exhaust air.
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