Document Detail


Optimizing solar UV-radiation exposures for vitamin D3: comparing global and diffuse spectral UV radiation.
MedLine Citation:
PMID:  18302489     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Currently, there is a major gap in the knowledge that is needed to optimize the beneficial effects related to ultraviolet (UV) radiation at wavelengths that induce vitamin D(3) synthesis (UV(D3)) compared to reducing the biologically damaging overexposure to UV radiation. The aim of this study was to investigate the use of diffuse (radiation that is scattered from all directions) UV radiation to optimize exposures to UV(D3) radiation and maximize the reduction of exposure to UVA radiation. Data on global and diffuse solar UV-radiation spectra were collected at 10-min intervals in the Southern Hemisphere in the late spring and summer from 1 November 2006 to 28 February 2007. For a solar zenith angle (SZA) of approximately 5 degrees , the observed maximum UV(D3) irradiances were 0.80 W/m(2) and 0.46 W/m(2) for global and diffuse UV radiation, respectively. The observed maximum UVA irradiances were 79.0 W/m(2) and 36.2 W/m(2) for global and diffuse UV radiation, respectively. For diffuse UV radiation, the maximum ratio of vitamin D(3) to UVA radiation was 1.75% at a SZA of approximately 10 degrees , whereas the maximum ratio for global UV was 1.27% at 10 degrees . For SZAs of 25 degrees and less, more UV radiation is in the wavelength region contributing to vitamin D(3) synthesis (UV(D3)) than in the UVA region for diffuse UV radiation than for global UV radiation.
Authors:
David J Turnbull; Alfio V Parisi
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Radiation research     Volume:  169     ISSN:  0033-7587     ISO Abbreviation:  Radiat. Res.     Publication Date:  2008 Mar 
Date Detail:
Created Date:  2008-02-27     Completed Date:  2008-04-08     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401245     Medline TA:  Radiat Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  344-9     Citation Subset:  IM; S    
Affiliation:
Centre for Rural and Remote Area Health, University of Southern Queensland, Toowoomba, Queensland 4350, Australia. turnbull@usq.edu.au
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MeSH Terms
Descriptor/Qualifier:
Body Burden
Environmental Exposure / analysis*
Humans
Radiation Dosage
Radiation Monitoring / methods*
Relative Biological Effectiveness
Scattering, Radiation
Seasons*
Spectrophotometry, Ultraviolet / methods*
Sunlight*
Vitamin D / biosynthesis*
Vitamin D Deficiency / prevention & control*
Chemical
Reg. No./Substance:
1406-16-2/Vitamin D

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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