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Reports of nonmelanoma skin cancers occurring on the dorsal hands of people who had used ultraviolet light sources for application of artificial nails has prompted concern about the carcinogenic effects of these devices. To address the safety of the nail-curing units, investigators conducted a rigorous evaluation of six different nail lamps: three fluorescent ultraviolet A (UVA) sources and three LED-based units. Spectroradiometric measurements were performed at 1-nm intervals, from 200 nm to 800 nm. Measurements were obtained at 1-cm and 20-cm distances from the devices (comparable to expected exposures of the hands and face, respectively). The peak emissions from all light sources were in the UVA range; none emitted in the UVC range.
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