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Analyzing UV-B narrowband solar irradiance: Comparison with erythemal and vitamin D production irradiances

Paper ID Volume ID Publish Year Pages File Format Full-Text
30658 44495 2012 7 PDF Available
Title
Analyzing UV-B narrowband solar irradiance: Comparison with erythemal and vitamin D production irradiances
Abstract

The heliotherapy and the phototherapy are mainly focused on taking benefit of the therapeutic effects of the ultraviolet (UV) irradiance on different skin diseases. The use of UV-B narrowband lamps, with emissions centered at 311 nm, has spread out among the dermatologist community because of its high therapeutic effect in comparison with its low erythema dose. For cloudless sun exposure, the balance of solar erythemal and solar narrowband (NB)-equivalent irradiances depends on several factors such as the solar zenith angle (SZA), the total ozone column (TOC) and the altitude. For SZA below 55°, the ratio of solar UV-B narrowband and erythemal irradiances increases with the SZA whereas the ratio of vitamin D production and erythemal irradiances decreases with the SZA with the maximum around midday. Furthermore, the solar NB ratio also increases with the TOC because the shorter wavelengths of the erythemal action spectrum are more affected by the ozone absorption processes. Considering the daily variations of the ratio between narrowband and erythemal irradiance, sun exposures avoiding midday hours are recommended in order to prevent negative side-effects. However to accumulate great NB doses and sufficient vitamin D in winter months is difficult because the time exposures may be longer than the day duration.

► We compare benefits and side-effects of sun exposures in heliotherapy. ► For SZA < 55°, the ratio UV-B NB/erythemal irradiances increases with the solar zenith angle. ► The ratio vitamin D/erythemal irradiances decreases with the solar zenith angle. ► The ratio UV-B narrowband/erythemal irradiances increases with the ozone content. ► Sun exposure avoiding midday is recommended to increase the benefit/risk ratios.

Keywords
Phototherapy/heliotherapy; Erythemal effect; Vitamin D; Narrowband irradiance; Psoriasis
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Analyzing UV-B narrowband solar irradiance: Comparison with erythemal and vitamin D production irradiances
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 117, 5 December 2012, Pages 90–96
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us