Variations in the short wavelength cut-off of the solar UV spectra

Parisi, Alfio and Turner, Joanna (2006) Variations in the short wavelength cut-off of the solar UV spectra. Photochemical and Photobiological Sciences, 5 (3). pp. 331-335. ISSN 1474-905X

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Abstract

[Summary]: Cloud and solar zenith angle (SZA) are two major factors that influence the magnitude of the biologically damaging UV (UVBD) irradiances for humans. However, the effect on the short wavelength cut-off due to SZA and due to clouds has not been investigated for biologically damaging UV for cataracts. This research aims to investigate the influence of cloud and SZA on the short wavelength cut-off of the spectral UVBD for cataracts. The spectral biologically damaging UV for cataracts on a horizontal plane was calculated by weighting the spectral UV measured with a spectroradiometer with the action spectrum for the induction of cataracts in a porcine lens. The UV spectra were obtained on an unshaded plane at a latitude of 29.5o S. The cut-off wavelength was defined as the wavelength at which the biologically damaging spectral irradiance was 0.1% of the maximum biologically damaging irradiance for that scan. For the all sky conditions, the short wavelength cut-off ranged by 12 nm for the SZA range of 5 to 80 degrees and the maximum in the spectral UVBD ranged by 15 nm. Similarly, for the cloud free cases, the short wavelength cut-off ranged by 9 nm for the same SZA range. Although, cloud has a large influence on the magnitude of the biologically damaging UV for cataracts, the influence of cloud on the short wavelength cut-off for the biologically damaging UV for cataracts is less than the influence of the solar zenith angle.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Reproduced with permission from the Royal Society of Chemistry. Photochemical and Photobiological Sciences located at: http://www.rsc.org/Publishing/Journals/pp/index.asp
Depositing User: Assoc Prof Alfio Parisi
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 11 Oct 2007 00:38
Last Modified: 02 Jul 2013 22:36
Uncontrolled Keywords: cataracts; action spectrum; cut-off wavelength; UV; spectral; spectrum
Fields of Research (FOR2008): 02 Physical Sciences > 0299 Other Physical Sciences > 029904 Synchrotrons; Accelerators; Instruments and Techniques
Identification Number or DOI: doi: 10.1039/b512029b
URI: http://eprints.usq.edu.au/id/eprint/1251

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