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Ultraviolet radiation protection by a beach umbrella

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Utrillas, MP and Martinez-Lozano, JA and Nunez, M (2010) Ultraviolet radiation protection by a beach umbrella. Photochemistry and Photobiology, 86 (2). pp. 449-456. ISSN 1751-1097

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Abstract

A beach umbrella intercepts all direct UV irradiance, but only part of the diffuse component. Using a simple sky view factor model, we have determined the fraction of the hemispheric diffuse irradiance that is not intercepted by the umbrella. Assuming a sensor at the surface and close to the center of the umbrella, isotropic diffuse irradiance and for an umbrella of 80 cm radius and 100 cm high, our results show that approximately 34% of the incident horizontal irradiance is not intercepted by the umbrella. These results agree with irradiance measurements conducted with and without the umbrella. The model is next extended to examine receipt of UV radiation by a human figure in a vertical position, either standing or sitting.

Item Type: Article
Journal or Publication Title: Photochemistry and Photobiology
Page Range: pp. 449-456
ISSN: 1751-1097
Identification Number - DOI: 10.1111/j.1751-1097.2009.00677.x
Additional Information: The original publication is available at http://www.interscience.wiley.com/
Date Deposited: 05 Nov 2010 05:09
Last Modified: 18 Nov 2014 04:13
URI: http://eprints.utas.edu.au/id/eprint/10227
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