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Reusable ultraviolet monitors: design, characteristics, and efficacy.
Journal of the American Academy of Dermatology
|November 1, 1983
Summary
New reusable ultraviolet (UV) dosimetry badges visually indicate daily UV exposure using a reversible color change. These badges accurately predict UV-dose related erythema response from sunlight and can be reused multiple times.
Area of Science:
- Dermatology
- Photobiology
- Medical Devices
Background:
- Accurate measurement of ultraviolet (UV) radiation exposure is crucial for understanding its effects on skin.
- Existing dosimetry methods may lack visual feedback or reusability.
- Development of selective UV-A and UV-B monitoring is needed.
Purpose of the Study:
- To develop and characterize reusable UV dosimetry badges.
- To assess the clinical efficacy of these badges in predicting erythema response.
- To create devices selectively measuring UV-A and UV-B radiation.
Main Methods:
- Development of two-sided, tape-like dosimeters utilizing photochromic aziridine reactions.
- Design of versions sensitive to UV-B (280-320 nm) and UV-A (320-400 nm) radiation.
- Clinical testing and outdoor efficacy evaluation against minimal erythema dose (MED) and erythema response.
Main Results:
- UV-B monitor accurately predicts UV dose-related erythema response to sunlight.
- UV-A monitor measures exposures from 0.8 to 10 J/cm².
- Badges are optically reversible, reusable 8-10 times, and can be re-zeroed with sunlight.
Conclusions:
- Reusable photochromic dosimetry badges offer a practical method for monitoring cumulative UV exposure.
- The UV-B version effectively predicts erythema response from solar radiation.
- Limitations include potential inaccuracy with artificial UV sources.