A dose of 3.24 mJ/cm^2 222 nm Far-UVC irradiation inactivates 90% of Staphylococcus aureus.
Reference
Hessling M, Haag R, Sieber N, Vatter P. The impact of far-UVC radiation (200-230 nm) on pathogens, cells, skin, and eyes - a collection and analysis of a hundred years of data. GMS Hyg Infect Control. 2021 Feb 16;16:Doc07. doi: 10.3205/dgkh000378. PMID: 33643774; PMCID: PMC7894148.