Patent ID: 8067750

Claim:
A device for disinfecting an enclosed area by use of ultraviolet radiation, comprising: a fixture that is attached to a fixed architectural partition that forms a part of the enclosed area and is positioned overhead in the enclosed area; an ultraviolet-C radiation emitter located in said fixture, wherein the ultraviolet-C radiation emitter is positioned to direct ultraviolet-C radiation from overhead and toward a wall of the enclosed area; and a plurality of radiation sensors that are positioned with the enclosed area and spaced apart from each other and apart from the fixture, and the plurality of radiation sensors are positioned in the enclosed area and below the ultraviolet-C radiation emitter to receive ultraviolet-C radiation emitted by the ultraviolet-C radiation emitter and reflected from the wall of said enclosed area, wherein said ultraviolet-C radiation reflected from the wall to said plurality of sensors is measured, and a controller terminates emission of ultraviolet-C radiation from said ultraviolet-C radiation emitter after a predetermined accumulated dosage of radiation is received by each of said radiation sensors.