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Lindgren, J., Gehrmann, W. H., Ferguson, G. W. & Pinder, J. E. (2008) Measuring Effective Vitamin D3-Producing Ultraviolet B Radiation Using Solartech’s Solarmeter® 6.4 Handheld, UVB Radiometer. Bulletin of the Chicago Herpetological Society, 43 57–62. 
Added by: Sarina (09 Nov 2009 19:16:59 UTC)   
Resource type: Journal Article
BibTeX citation key: Lindgren2008
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Categories: Englisch = English
Keywords: Photometrie = Photometry, Ultraviolett = Ultraviolet
Creators: Ferguson, Gehrmann, Lindgren, Pinder
Collection: Bulletin of the Chicago Herpetological Society
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Abstract
Several types of UVB-emitting lamps were tested for their ability to generate vitamin D 3 and related isomers from precursor 7- dehydrocholesterol or provitamin D in an in-vitro ampoule system. Lamp output was also measured using a spectroradiometer and two types of broadband UVB meters. UVB recorded in spectroradiograms was partitioned in several different ways, for example, as sub-bands. The various measures of UVB, including UVB meter readings, were regressed against the ampoule measurements of percent photoproduct to determine which could best explain D synthesis. It was found that UVB irradiances between 280 and 304 nm, D Yield Index, and Solarmeter® 6.4 readings each explained greater than 95% of ampoule D synthesis. Equations are presented that allow conversion of Solarmeter® 6.4 units (IU/min) to D -irradiance units (µW/cm2) or D Yield Index values. Unlike other broadband UVB meters, readings by the Solarmeter® 6.4 of a variety of lamp types are directly comparable for D -synthesizing ability regardless of differences in spectral output among lamps.
Added by: Sarina  Last edited by: Sarina
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