Vitamin D effective UV wavelengths due to scattering in shade

Turnbull, David J., Parisi, Alfio V., & Kimlin, Michael G. (2005) Vitamin D effective UV wavelengths due to scattering in shade. The Journal of Steroid Biochemistry and Molecular Biology, 96(5), pp. 431-436.

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Abstract

Solar UVB radiation (280-320 nm) is an initiator of Vitamin D[3] production in the human skin. While numerous studies have been conducted in relation to the biological impact of UV exposure in full sun, less research has investigated the irradiances in shade. The purpose of this study was to determine the levels of UV radiation in relation to Vitamin D[3] induction with six commonly encountered shade environments for the larger solar zenith angles observed during autumn and winter. Spectral UV irradiance measurements were made under relatively clear sky conditions at a sub-tropical Southern Hemisphere site for six specific shade environments and solar zenith angle between 35° and 60° to investigate the biologically effective UV irradiances for pre-Vitamin D[3] production. Data from this research indicates that pre-Vitamin D[3] effective UV wavelengths in the shade were most significant for tree shade and a shade umbrella. Compared to that in full sun, pre-Vitamin D[3] effective UV wavelengths were at levels of approximately 52 and 55%, respectively, beneath the shade umbrella and in tree shade. UVB irradiance levels in the shade of a northern facing covered veranda and in a car with windows closed were significantly less than those beneath the shade umbrella, with levels of approximately 11 and 0%, respectively, of those in full sun. Shade is important as a UV minimisation strategy; however, it may also play an important role in providing the human body with adequate levels of UVB radiation for pre-Vitamin D[3] production without experiencing the relatively higher levels of UVA irradiances present in full sun.

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ID Code: 7744
Item Type: Journal Article
Refereed: Yes
Additional Information: For more information, please refer to the journal’s website (see hypertext link) or contact the author: m.kimlin@qut.edu.au
DOI: 10.1016/j.jsbmb.2005.04.039
ISSN: 0960-0760
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2005 Elsevier
Deposited On: 28 May 2007 00:00
Last Modified: 29 Feb 2012 13:14

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