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Gunther Seckmeyer, Michael Schrempf, Anna Wieczorek, Stefan Riechelmann, Kathrin Graw, Stefan Seckmeyer and Maria Zankl A Novel Method to Calculate Solar UV Exposure Relevant to Vitamin D Production in Humans Photochemistry and Photobiology 89

Version of Record online: 26 MAY 2013 | DOI: 10.1111/php.12074

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We present a novel method to calculate vitamin D3 weighted exposure by integrating the incident solar spectral radiance over all relevant parts of the human body. Earlier investigations are based on the irradiance on surfaces, whereas our calculated exposure of a human model takes into account the complex geometry of the radiation field. We calculate the exposure times needed to gain enough vitamin D3 for different situations and seasons. For December 21st (noon, cloudy) at least in central Europe sufficient vitamin D3 cannot be obtained with realistic clothing, even if the exposure were extended to all daylight hours.

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