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Far UVC 222nm Lamp Excimer System 120W
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As the world's leading manufacturer of UV lamps,Sailon successfully developmented FAR UVC 222nm Lamp Excimer System.
Why Sailon Far-UVC 222nm Lamp is safe for Human?
How to achieve real coexistence between man and machine?The following research will answer those questions.(Far-UVC light (222 nm) efficiently and safely inactivates airborne human coronaviruses
https://lnkd.in/gpacz_Y) #Farr-UVC#222nm UVC Lamp#COVID-19
Sailon has the world's most popular Far-UVC 222nm Lamp solution#UV
More Sailon solution Pls contacted:siying@uvcsailon.com
Abstract
A direct approach to limit airborne viral transmissions is to inactivate them within a short time of their production. Germicidal ultraviolet light, typically at 254 nm, is effective in this context but, used directly, can be a health hazard to skin and eyes. By contrast, far-UVC light (207–222 nm) efficiently kills pathogens potentially without harm to exposed human tissues. We previously demonstrated that 222-nm far-UVC light efficiently kills airborne influenza virus and we extend those studies to explore far-UVC efficacy against airborne human coronaviruses alpha HCoV-229E and beta HCoV-OC43. Low doses of 1.7 and 1.2 mJ/cm2 inactivated 99.9% of aerosolized coronavirus 229E and OC43, respectively. As all human coronaviruses have similar genomic sizes, far-UVC light would be expected to show similar inactivation efficiency against other human coronaviruses including SARS-CoV-2. Based on the beta-HCoV-OC43 results, continuous far-UVC exposure in occupied public locations at the current regulatory exposure limit (~3 mJ/cm2/hour) would result in ~90% viral inactivation in ~8 minutes, 95% in ~11 minutes, 99% in ~16 minutes and 99.9% inactivation in ~25 minutes. Thus while staying within current regulatory dose limits, low-dose-rate far-UVC exposure can potentially safely provide a major reduction in the ambient level of airborne coronaviruses in occupied public locations.
Results
Inactivation of human coronaviruses after exposure to 222 nm light in aerosols infectivity assay
We used a standard approach to measure viral inactivation, assaying coronavirus infectivity in human host cells (normal lung cells), in this case after exposure in aerosols to different doses of far-UVC light. We quantified virus infectivity with the 50% tissue culture infectious dose TCID50 assay28, and estimated the corresponding plaque forming units (PFU)/ml using the conversion PFU/ml = 0.7 TCID5029. Figure 1 shows the fractional survival of aerosolized coronaviruses HCoV-229E and HCoV-OC43 expressed as PFUUV/PFUcontrols as a function of the incident 222-nm dose. Robust linear regression (Table 1) using iterated reweighted least squares30 indicated that the survival of both genera alpha and beta is consistent with a classical exponential UV disinfection model (R2 = 0.86 for HCoV-229E and R2 = 0.78 for HCoV-OC43). For the alpha coronavirus HCoV-229E, the inactivation rate constant (susceptibility rate) was k = 4.1 cm2/mJ (95% confidence intervals (C.I.) 2.5–4.8) which corresponds to an inactivation cross-section (or the dose required to kill 90% of the exposed viruses) of D90 = 0.56 mJ/cm2. Similarly, the susceptibility rate for the beta coronavirus HCoV-OC43 was k = 5.9 cm2/mJ (95% C.I. 3.8–7.1) which corresponds to an inactivation cross section of D90 = 0.39 mJ/cm2.
Part of the reference:Far-UVC light (222 nm) efficiently and safely inactivates airborne human coronaviruses
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