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Occupant UV exposure measurements for upper-room ultraviolet germicidal irradiation

Paper ID Volume ID Publish Year Pages File Format Full-Text
29475 44411 2016 5 PDF Available
Title
Occupant UV exposure measurements for upper-room ultraviolet germicidal irradiation
Abstract

•An 80° field of view tube should be used on flat UV-C sensors for safety measurements•The FOV tube reduced lower room irradiance readings by 18–34%.•Lower readings allow more UV-C radiation without compromising occupant safety.•Recommendations are made to standardize lower room irradiance measurement techniques.

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 1.73 m 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.

Keywords
Ultraviolet germicidal irradiation; Threshold limit value; Occupant safety measurements
First Page Preview
Occupant UV exposure measurements for upper-room ultraviolet germicidal irradiation
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 159, June 2016, Pages 88–92
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering