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Action spectrum conversion factors that change erythemally weighted to previtamin D3-weighted UV doses.
Photochem Photobiol. 2008 Sep-Oct; 84(5):1277-83.PP

Abstract

Many solar UV measurements, either terrestrial or personal, weight the raw data by the erythemal action spectrum. However, a problem arises when one tries to estimate the benefit of vitamin D(3) production based on erythemally weighted outdoor doses, like those measured by calibrated R-B meters or polysulphone badges, because the differences between action spectra give dissimilar values. While both action spectra peak in the UVB region, the erythemal action spectrum continues throughout the UVA region while the previtamin D(3) action spectrum stops near that boundary. When one uses the previtamin D(3) action spectrum to weight the solar spectra (D(eff)), one gets a different contribution in W m(-2) than what the erythemally weighted data predicts (E(eff)). Thus, to do proper benefit assessments, one must incorporate action spectrum conversion factors (ASCF) into the calculations to change erythemally weighted to previtamin D(3)-weighted doses. To date, all benefit assessments for vitamin D(3) production in human skin from outdoor exposures are overestimates because they did not account for the different contributions of each action spectrum with changing solar zenith angle and ozone and they did not account for body geometry. Here we describe how to normalize the ratios of the effective irradiances (D(eff)/E(eff)) to get ASCF that change erythemally weighted to previtamin D(3)-weighted doses. We also give the ASCF for each season of the year in the northern hemisphere every 5 degrees from 30 degrees N to 60 degrees N, based on ozone values. These ASCF, along with geometry conversion factors and other information, can give better vitamin D(3) estimates from erythemally weighted outdoor doses.

Authors+Show Affiliations

Sun Systems & Svc, Inc., Oak Park, MI, USA.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

18513232

Citation

Pope, Stanley J., et al. "Action Spectrum Conversion Factors That Change Erythemally Weighted to Previtamin D3-weighted UV Doses." Photochemistry and Photobiology, vol. 84, no. 5, 2008, pp. 1277-83.
Pope SJ, Holick MF, Mackin S, et al. Action spectrum conversion factors that change erythemally weighted to previtamin D3-weighted UV doses. Photochem Photobiol. 2008;84(5):1277-83.
Pope, S. J., Holick, M. F., Mackin, S., & Godar, D. E. (2008). Action spectrum conversion factors that change erythemally weighted to previtamin D3-weighted UV doses. Photochemistry and Photobiology, 84(5), 1277-83. https://doi.org/10.1111/j.1751-1097.2008.00373.x
Pope SJ, et al. Action Spectrum Conversion Factors That Change Erythemally Weighted to Previtamin D3-weighted UV Doses. Photochem Photobiol. 2008 Sep-Oct;84(5):1277-83. PubMed PMID: 18513232.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Action spectrum conversion factors that change erythemally weighted to previtamin D3-weighted UV doses. AU - Pope,Stanley J, AU - Holick,Michael F, AU - Mackin,Steven, AU - Godar,Dianne E, Y1 - 2008/05/29/ PY - 2008/6/3/pubmed PY - 2009/3/6/medline PY - 2008/6/3/entrez SP - 1277 EP - 83 JF - Photochemistry and photobiology JO - Photochem Photobiol VL - 84 IS - 5 N2 - Many solar UV measurements, either terrestrial or personal, weight the raw data by the erythemal action spectrum. However, a problem arises when one tries to estimate the benefit of vitamin D(3) production based on erythemally weighted outdoor doses, like those measured by calibrated R-B meters or polysulphone badges, because the differences between action spectra give dissimilar values. While both action spectra peak in the UVB region, the erythemal action spectrum continues throughout the UVA region while the previtamin D(3) action spectrum stops near that boundary. When one uses the previtamin D(3) action spectrum to weight the solar spectra (D(eff)), one gets a different contribution in W m(-2) than what the erythemally weighted data predicts (E(eff)). Thus, to do proper benefit assessments, one must incorporate action spectrum conversion factors (ASCF) into the calculations to change erythemally weighted to previtamin D(3)-weighted doses. To date, all benefit assessments for vitamin D(3) production in human skin from outdoor exposures are overestimates because they did not account for the different contributions of each action spectrum with changing solar zenith angle and ozone and they did not account for body geometry. Here we describe how to normalize the ratios of the effective irradiances (D(eff)/E(eff)) to get ASCF that change erythemally weighted to previtamin D(3)-weighted doses. We also give the ASCF for each season of the year in the northern hemisphere every 5 degrees from 30 degrees N to 60 degrees N, based on ozone values. These ASCF, along with geometry conversion factors and other information, can give better vitamin D(3) estimates from erythemally weighted outdoor doses. SN - 0031-8655 UR - https://www.unboundmedicine.com/medline/citation/18513232/Action_spectrum_conversion_factors_that_change_erythemally_weighted_to_previtamin_D3_weighted_UV_doses_ L2 - https://doi.org/10.1111/j.1751-1097.2008.00373.x DB - PRIME DP - Unbound Medicine ER -