Author: Aurora Baluja; Justo Arines; Ramon Vilanova; Carmen Bao-Varela; Maria Teresa Flores-Arias
Title: UV light dosage distribution over irregular respirator surfaces. Methods and implications for safety Document date: 2020_4_11
ID: mug5g92f_2
Snippet: UVGI acts primarily over surfaces. Thus, surface shape, incidence angle and distance related to the light source are key factors for local irradiance. The resulting UV dose (fluence) is therefore the product of the irradiance by exposure time. Given the high spread potential and severity of SARS-CoV2, local overdose may be sacrificed in order to minimise contamination risk by underexposure, as most FFRs can tolerate higher than germicidal doses. .....
Document: UVGI acts primarily over surfaces. Thus, surface shape, incidence angle and distance related to the light source are key factors for local irradiance. The resulting UV dose (fluence) is therefore the product of the irradiance by exposure time. Given the high spread potential and severity of SARS-CoV2, local overdose may be sacrificed in order to minimise contamination risk by underexposure, as most FFRs can tolerate higher than germicidal doses. However, protocols for mask descontamination inside rooms with powerful UV-C sources might not ensure an even dosage distribution among masks placed at different angles from the lamp.
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