3/28/2023 0 Comments Does uvc light kill viruses![]() ![]() Using far-UVC light in occupied indoor spaces The researchers found that more than 99.9% of the exposed virus had been killed by a very low exposure to far-UVC light.īased on their results, the researchers estimate that continuous exposure to far-UVC light at the current regulatory limit would kill 90% of airborne viruses in about 8 minutes, 95% in about 11 minutes, 99% in about 16 minutes, and 99.9% in about 25 minutes. After exposure to far-UVC light, the researchers tested to see how many of the viruses were still alive. ![]() The aerosols containing coronavirus were then flowed through the air in front of a far-UVC lamp. In the study, the researchers used a misting device to aerosolize two common coronaviruses. Photo: Center for Radiological Research at Columbia University. Study detailsĮquipment used to test the effect of far-UVC light on airborne coronaviruses. The new paper extends their research to seasonal coronaviruses, which are structurally similar to the SARS-CoV-2 virus that causes COVID-19. The researchers had previously shown that far-UVC light can safely kill airborne influenza viruses. Far-UVC light cannot penetrate the tear layer of the eye or the outer dead-cell layer of skin and so it cannot reach or damage living cells in the body. To continuously and safely disinfect occupied indoor areas, researchers at Columbia University Irving Medical Center have been investigating far-UVC light (222 nm wavelength). BackgroundĬonventional germicidal UVC light (254 nm wavelength) can be used to disinfect unoccupied spaces such as empty hospital rooms or empty subway cars, but direct exposure to these conventional UV lamps is not possible in occupied public spaces, as this could be a health hazard. The research was published today in Scientific Reports. “Based on our results, continuous airborne disinfection with far-UVC light at the current regulatory limit could greatly reduce the level of airborne virus in indoor environments occupied by people,” says the study’s lead author David Brenner, PhD, Higgins Professor of Radiation Biophysics at Columbia University Vagelos College of Physicians and Surgeons and director of the Center for Radiological Research at Columbia University Irving Medical Center. More than 99.9% of seasonal coronaviruses present in airborne droplets were killed when exposed to a particular wavelength of ultraviolet light that is safe to use around humans, a new study at the Vagelos College of Physicians and Surgeons at Columbia University Irving Medical Center has found. ![]()
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