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Occupant UV Exposure Measurements for Upper-Room Ultraviolet Germicidal Irradiation
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Mar 11 2016
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Source: J Photochem Photobiol B. 159:88-92.
[PDF-224.56 KB]
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Alternative Title:J Photochem Photobiol B
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Description:The threshold limit value (TLV) guideline for ultraviolet (UV) radiation specifies that irradiance measurements to ensure occupant safety be taken over an angle of 80° at the sensor. The purpose of this study was to evaluate the effect of an 80° field of view (FOV) tube on lower room UV-C irradiation measurements. Measurements were made in an experimental chamber at a height of 1.73m with and without an FOV tube. The FOV tube reduced the lower room irradiance readings by 18-34%, a statistically significant reduction compared to the bare sensor. An 80° FOV tube should be used for lower room irradiance measurements to comply with the TLV guideline. The resulting lower readings would allow more UV-C radiation in the upper room without compromising occupant safety. More UV-C radiation in the upper room could increase efficacy of UVGI systems for reducing transmission of airborne infectious diseases. In addition, recommendations are made to standardize lower room irradiance measurement techniques.
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Pubmed ID:27038734
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Pubmed Central ID:PMC4854786
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Volume:159
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