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...
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