Two-photon excited fluorescence energy transfer: a study based on oligonucleotide rulers.
11 November 2006
Outdoor workers in Australia are exposed to very high ambient levels of ultraviolet (UV) radiation. Studies have shown that up to 90% of outdoor workers experienced UV exposures in excess of the occupational UVR exposure standard .
Surfaces that reflect UV have been shown to significantly affect UV exposures and vary with solar zenith angles (SZA) and orientation of the surface  and surface type . This investigation shows that seasonal variation is just as important to UV exposures affected by reflected UV radiation. In fact, UV exposures received in cooler seasons appear to be impacted more by reflected UV than warmer seasons, despite higher levels of global UV.
The presence of such high ambient UV levels is proposed to be the reason for the disparity between UV exposures measured in spring and autumn, due to proportions of direct and diffuse UV radiation, despite the use of a UV reflector that has a high UV reflectivity in comparison to natural surfaces (at least 20% in the UVB waveband).
Wahlroos, R., Toivonen, J., Tirri, M. and Hänninen, P., 2006. Two-photon excited fluorescence energy transfer: a study based on oligonucleotide rulers. Journal of fluorescence, 16(3), pp.379-386.
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Category: Photonics & Optoelectronics