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Thus, while maintaining current regulatory dose limits, low dose rate far-UV exposure may safely and substantially reduce environmental levels of airborne coronavirus in occupied public places.Far-UVC devices are being commercially sold as “safe for humans” for the inactivation of SARS-CoV-2, without supporting human safety data. Based on the beta-HCoV-OC43 results, at the current regulatory exposure limit (~3 mJ/cm 2 /hour), continuous far-UVC exposure in an inhabited public place would result in inactivation of ~90% of viruses within ~8 minutes, 95% within ~11 minutes, 99% within ~16 minutes, and 99.9% inactivation within ~25 minutes. Since all human coronaviruses have similar genome sizes, it is expected that far UVC light will show similar inactivation efficiency for other human coronaviruses including SARS-CoV-2.
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low doses of 1.7 and 1.2 mJ/cm 2 inactivated 99.9% of the aerosolized coronaviruses 229E and OC43, respectively.
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Having previously demonstrated that 222 nm far UVC light is effective in killing airborne influenza viruses, we extended these studies to explore the efficacy of far UVC light against airborne human COVID-19 alpha HCoV-229E and beta HCoV-OC43.
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In contrast, far UVC (207-222 nm) can effectively kill pathogens without harming exposed human tissue.
FAR UVC LAMP SKIN
Germicidal UV light (typically 254 nm) is effective in this case, but the direct application may pose a health hazard to the skin and eyes. (ASP) released.Ģ Far UVC light (222 nm) effectively and safely inactivates airborne human COVID-19.Ī direct way to limit the spread of airborne viruses is to inactivate them for a short period of time after they are produced. It is reported that the research results have been published on March 29 in the international journal “ Photochemistry & Photobiology” (Photochemistry & Photobiology), and will be held in Chicago on June 28 at the 2020 biennial meeting of the American Society of Photobiology. Therefore, this technology is expected to be widely used in the field of sterilization and disinfection. Studies have shown that deep ultraviolet radiation with a wavelength of 222 nm has a strong disinfection ability and is harmless to human skin. Therefore, the research team came to a conclusion that since deep ultraviolet light with a wavelength of 222nm can only reach the outermost layer of the skin-the stratum corneum, it will not damage the DNA of skin cells and ultimately has no adverse effects. In addition, they also studied and observed its effect on the eyes of mice, and no abnormalities were found even under the microscope. It was found that the mice irradiated with UVB light source suffered from skin cancer and showed adverse reactions, while the mice irradiated with 222nm UV lampdid not suffer from skin cancer. One group is placed under a 222nm germicidal lamp, and the other groups are placed under a UVB light source of 280-315nm. The research team placed the mice under different ultraviolet radiation. In view of this, this technology is expected to be widely used in sterilization and disinfection in places such as medical institutions and daily life. This is the first time in the world that the direct and repeated irradiation of 222nm ultraviolet light with a strong bactericidal effect will not cause skin cancer, which shows that deep ultraviolet light with a wavelength of 222nm is safe for human eyes and skin. However, research by Kobe University and Yuzhiwang found that in terms of the ability to eliminate bacteria on the skin, deep ultraviolet light with wavelengths of 222nm and 254nm has equivalent sterilization effects, and UVC radiation at 222nm will not cause skin cancer. However, UVC radiation is harmful to human skin due to its penetrating power. The deep ultraviolet wavelength of 200-280nm has a bactericidal effect and has been widely used for sterilization and disinfection. According to reports, a joint study between Kobe Universityin Japan and Ushio, a Japanese LED component manufacturer, found that deep ultraviolet radiation with a wavelength of far 222nm UV light is harmless to human skin and eyes.
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