Extreme Exposure to Filtered Far-UVC: A Case Study.
Photochem Photobiol
; 97(3): 527-531, 2021 05.
Article
in English
| MEDLINE | ID: covidwho-1066753
ABSTRACT
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.
Full text:
Available
Collection:
International databases
Database:
MEDLINE
Main subject:
Skin
/
Ultraviolet Rays
/
Radiation Exposure
Type of study:
Case report
/
Experimental Studies
/
Observational study
Limits:
Adult
/
Humans
/
Male
Language:
English
Journal:
Photochem Photobiol
Year:
2021
Document Type:
Article
Affiliation country:
Php.13385
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