@article{Eadie_E-2021_26416,
title = {Extreme Exposure to Filtered Far-UVC: A Case Study},
author = {Eadie, E. and Barnard, I. and Ibbotson, S. and Wood, K.},
month = {feb},
year = {2021},
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 1,500 mJcm-2, whereas skin yellowing that appeared immediately and resolved within 24 hours occurred with a 6,000 mJcm-2 exposure. No erythema was observed at any time point with exposures up to 18,000 mJcm-2. These results combined with Monte Carlo Radiative Transfer computer modelling 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.},
journal = {Photochemistry and Photobiology},
publisher = {Wiley},
url = {https://doi.org/10.1111/php.13385},
}
