Deprecated: Implicit conversion from float 213.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Photochem+Photobiol 2021 ; 97 (3): 527-531 Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Extreme Exposure to Filtered Far-UVC: A Case Study(dagger) #MMPMID33471372
Eadie E; Barnard IMR; Ibbotson SH; Wood K
Photochem Photobiol 2021[May]; 97 (3): 527-531 PMID33471372show ga
Far-UVC devices are being commercially sold as "safe for humans" for the inactivation of SARS-CoV-2, without supporting human safety data. We felt there was a need for rapid proof-of-concept human self-exposure, to inform future controlled research and promote informed discussion. A Fitzpatrick Skin Type II individual exposed their inner forearms to large radiant exposures from a filtered Krypton-Chloride (KrCl) far-UVC system (SafeZoneUVC, Ushio Inc., Tokyo, Japan) with peak emission at 222 nm. No visible skin changes were observed at 1500 mJ cm(-2) ; whereas, skin yellowing that appeared immediately and resolved within 24 h occurred with a 6000 mJ cm(-2) exposure. No erythema was observed at any time point with exposures up to 18 000 mJ cm(-2) . These results combined with Monte Carlo Radiative Transfer computer modeling suggest that filtering longer ultraviolet wavelengths is critical for the human skin safety of far-UVC devices. This work also contributes to growing arguments for the exploration of exposure limit expansion, which would subsequently enable faster inactivation of viruses.