UV-A: Biological Effects of Ultraviolet Radiation with Emphasis on Human Responses to Longwave Ultraviolet

The origin of this text was a request by industry and government to summarize the biological effects and to estimate the limits of safe exposure to longwave ul­ traviolet radiation. The specific issue was the safety of a small medium-pressure mercury arc designed to emit UV-A (NUVA-Lite, L. D. Caulk Co. , Milford, Delaware) for photopolymerization of resinous fillings used in dentistry. How-­ ever, the context grew to become a consideration of the risks and benefits to hu­ mans of electroma...