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Occupant UV Exposure Measurements for Upper-Room Ultraviolet Germicidal Irradiation
  • Published Date:
    Mar 11 2016
  • Source:
    J Photochem Photobiol B. 159:88-92.


Public Access Version Available on: June 01, 2017 information icon
Please check back on the date listed above.
Details:
  • Pubmed ID:
    27038734
  • Pubmed Central ID:
    PMC4854786
  • Funding:
    D43 TW009379/TW/FIC NIH HHS/United States
    R01 OH009050/OH/NIOSH CDC HHS/United States
  • Document Type:
  • Collection(s):
  • 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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