Kollias N, Baqer A H, Ou-Yang H
Johnson and Johnson Consumer Product Worldwide, 199 Grandview Road, Skillman, NJ 08558, USA.
Photodermatol Photoimmunol Photomed. 2003 Apr;19(2):89-92. doi: 10.1034/j.1600-0781.2003.00002.x.
Biologically effective solar ultraviolet radiation is defined as the product of the intensity of the solar spectrum and the erythema action spectrum at each wavelength. In this way we may arrive at the weighted effectiveness of each wavelength of solar radiation to produce a sunburn reaction. There have been many measurements of the variation of the solar spectrum with the time of the day and the time of the year, but questions remain as to the variation of the quality of the spectrum and the contribution of the shortest wavelengths of solar terrestrial radiation. The purpose of the present study was to determine the variation of the biologically effective solar spectrum with the time of the day and the time of the year and to determine the variation of the shortest wavelength that contributes to the sunburn reaction with the time of the day and the time of the year.
Spectroradiometric measurements were made at ground level over the period of one year (1988-1989) and at different times of the day at latitude 29.5 degrees north. The measured spectral irradiance was multiplied wavelength by wavelength by the erythema action spectra.
We determined that the biologically effective solar spectrum remains essentially the same over the times of the day that sunburn may be experienced. The maximally effective wavelength of biologically effective solar radiation was determined to be 308 nm. The cut-off wavelength for biologically effective solar radiation (defined as the wavelength at which the biologically effective solar radiation is at 1% of its maximum) varied from 291 to 295 nm over the time of the year and from 292 to 296 nm over the day.
For all practical purposes the biologically effective spectrum of solar ultraviolet radiation may be considered to remain constant over the period when sunburn may occur and the minimal wavelength of sunlight that contributes to sunburn is in the range of 291-296 nm.
生物有效太阳紫外线辐射被定义为太阳光谱强度与各波长处红斑作用光谱的乘积。通过这种方式，我们可以得出太阳辐射各波长产生晒伤反应的加权有效性。已经有许多关于太阳光谱随一天中的时间和一年中的时间变化的测量，但关于光谱质量的变化以及太阳地面辐射最短波长的贡献仍存在疑问。本研究的目的是确定生物有效太阳光谱随一天中的时间和一年中的时间的变化，并确定导致晒伤反应的最短波长随一天中的时间和一年中的时间的变化。
在北纬29.5度的地面上，于一年期间（1988 - 1989年）以及一天中的不同时间进行了光谱辐射测量。将测量得到的光谱辐照度逐波长乘以红斑作用光谱。
我们确定，在可能经历晒伤的一天中的各个时间里，生物有效太阳光谱基本保持不变。生物有效太阳辐射的最大有效波长确定为308纳米。生物有效太阳辐射的截止波长（定义为生物有效太阳辐射为其最大值的1%时的波长）在一年中的时间里从291纳米变化到295纳米，在一天中的时间里从292纳米变化到296纳米。
在所有实际应用中，太阳紫外线辐射的生物有效光谱在可能发生晒伤的时间段内可被视为保持恒定，并且导致晒伤的太阳光最短波长在291 - 296纳米范围内。
