During the last twelve years several determinations of the distribution of erythemal effectiveness of radiation in the spectral region extending from wave-length 2400 or 2500 A. to about 3400 A. have indicated maximal effectiveness at 2967 A. However, all the investigators using monochromatic radiation employed the mercury vapor arc as source, so that their observations necessarily were limited to those wave-lengths represented by fairly intense lines of the mercury arc spectrum. These lines are not close enough together to allow accurate determination of the curve of erythemal effectiveness. Maximal effectiveness was assumed to be at 2967 A., its spectral position being roughly indicated by measurements at that wave-length and at wave-lengths no closer than 2925 and 3024 A.
Proceedings of the Iowa Academy of Science
©1933 Iowa Academy of Science, Inc.
Davis, George E.
"The Spectral Distribution of Erythemal Effectiveness of Ultraviolet Radiation,"
Proceedings of the Iowa Academy of Science, 40(1), 147-147.
Available at: https://scholarworks.uni.edu/pias/vol40/iss1/71