Journal
PHOTOCHEMISTRY AND PHOTOBIOLOGY
Volume 97, Issue 3, Pages 498-504Publisher
WILEY
DOI: 10.1111/php.13364
Keywords
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Funding
- NIH [5R42AI125006-03]
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Far-UVC lighting is gaining attention as an effective antimicrobial technology with minimal health hazards, and the use of OrthoChromic OC-1 film provides a simple and accurate method for measuring ultraviolet radiation exposure, potentially useful for health hazard monitoring in spaces with far-UVC lighting installations.
There is growing interest in far-UVC lighting, defined as wavelengths from 200 to 230 nm, because research has demonstrated these wavelengths to be an effective antimicrobial technology while posing a minimal hazard to human health. Far-UVC lighting is now being installed to directly irradiate spaces where humans are present, and it will be important to perform measurements to verify far-UVC lighting installations are operating within widely accepted exposure guidelines. In this work, we explore the use of a commercially available film, known as OrthoChromic OC-1, to measure ultraviolet radiation exposure. The film was tested with a variety of ultraviolet wavelengths and irradiance conditions, and the color change of the film was analyzed for increasing levels of radiant exposure. The film response extended over a dynamic range that was greater than the recommended exposure limits for far-UVC radiation so it can potentially be useful for health hazard monitoring. The spectrum of the incident ultraviolet radiation strongly affected the response of the film; therefore, for accurate measurements we recommend the measured spectrum match the spectrum used for calibration. Overall, dosimetry with this film provides a simple, accurate, and inexpensive method of quantifying ultraviolet radiation exposure that is suitable for far-UVC measurements.
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