Parisi Alfio V, Smith Don, Schouten Peter, Turnbull David J
Department of Biological and Physical Sciences, Faculty of Sciences, University of Southern Queensland, Toowoomba, Qld, Australia.
Photochem Photobiol. 2009 Jan-Feb;85(1):250-4. doi: 10.1111/j.1751-1097.2008.00428.x. Epub 2008 Aug 27.
The solar erythemal UV irradiances through human hair and the protection from UV provided by human head hair have been investigated for a solar zenith angle (SZA) range of 17-51 degrees for the conditions of a head upright in full sun, a head upright in shade and a head in full sun tilted toward the sun. The two hair lengths investigated were 49.1 +/- 7.1 mm for the short type and 109.5 +/- 5.5 mm for the long type. For the head upright in full sun, the irradiances through the hair ranged from 0.75 to 1.4 SED h(-1) for SZA <25 degrees and <0.6 SED h(-1) in shade. The ultraviolet protection factor (UPF) ranged from approximately 5 to 17 in full sun, with the UPF increasing with higher SZA. The longer hair provided a lower UPF than the shorter hair and for the head oriented toward the sun, there was a marginally lower UPF than for the upright head. This research shows that the UV exposure limits to the scalp through hair can be exceeded within short timeframes and provides important information to assist employers to comply with Workplace Health and Safety legislation.
在太阳天顶角（SZA）为17至51度的范围内，针对头部直立于全日照下、头部直立于阴凉处以及头部在全日照下朝太阳倾斜这三种情况，研究了透过人发的太阳红斑紫外线辐照度以及人头发对紫外线的防护作用。所研究的两种头发长度，短发型为49.1±7.1毫米，长发型为109.5±5.5毫米。对于头部直立于全日照下的情况，当SZA<25度时，透过头发的辐照度范围为0.75至1.4 SED h⁻¹，在阴凉处则<0.6 SED h⁻¹。紫外线防护系数（UPF）在全日照下范围约为5至17，且随着SZA增大而升高。长发提供的UPF低于短发，并且对于朝向太阳的头部，其UPF略低于直立头部。该研究表明，短时间内透过头发对头皮的紫外线暴露限值可能会被超过，并且为协助雇主遵守职业健康与安全法规提供了重要信息。
