RELATIVE ENERGY REQUIREMENTS FOR AN ERYTHEMAL RESPONSE OF SKIN TO MONOCHROMATIC WAVE LENGTHS OF ULTRAVIOLET PRESENT IN SOLAR SPECTRUM

[摘要] A high intensity grating monochromator was used to determine erythema-producing effectivemess of ultraviolet on untanned human abdominal skin and albino rabbit skin. Greatest efficiency was observed at 250-260 m[mu] with a second peak at 292 m[mu], a slight drop at 280 m[mu], and a rapid decrease at 240 and 310 m[mu]. A product curve was derived by multiplying the reciprocal of erythema energy values by the values for solar radiation under specific atmospheric conditions. This curve demonstrates that maximum solar erythema production occurs at 305-308 m[mu] and that longer wavelengths, though inefficient, account for a significant proportion of solar erythema because of the great amount of energy in sunlight at these wavelengths. Wavelengths shorter than 294 do not contribute to solar erythema.