Sayre R M, Cole C, Billhimer W, Stanfield J, Ley R D
Schering-Plough HealthCare Products, Memphis, Tennessee 38151.
Photodermatol Photoimmunol Photomed. 1990 Aug;7(4):159-65.
In evaluating sunscreen efficacy, spectral distribution of the irradiation sources can influence the sun protection factor (SPF). The purpose of this investigation was to examine the uniformity of ultraviolet (UV) spectral irradiance of solar simulators used in various SPF testing laboratories, compare them with natural sunlight UV radiation (UVR), and recommend performance limits to ensure that the variability of radiation sources in the UVB region minimally affects SPF estimates. The critical portion of the solar erythemogenic spectrum was identified as the UVB portion, defined as the region between 280 and 320 nm. The spectral irradiance of 26 solar simulators and other UV sources was measured and compared with a summer noon solar spectrum measured in Albuquerque, NM. Proposed spectral limits were developed as a 6-nm "acceptance band" centered on this standard spectrum normalized at 320 nm. The results indicated that the xenon-arc solar simulators currently used in the United States in testing sunscreens either meet the proposed standard solar spectrum or can be readily modified with available UV filters to meet this standard. The devices that have spectral characteristics not resembling sunlight fail to meet the proposed standard and should not be used for sunscreen SPF testing.
在评估防晒霜功效时，辐照源的光谱分布会影响防晒系数（SPF）。本研究的目的是检测各SPF测试实验室所使用的太阳模拟器的紫外（UV）光谱辐照度的均匀性，将其与自然阳光紫外线辐射（UVR）进行比较，并推荐性能限值，以确保UVB区域辐射源的变化对SPF估计的影响最小。太阳致红斑光谱的关键部分被确定为UVB部分，定义为280至320纳米之间的区域。测量了26个太阳模拟器和其他UV源的光谱辐照度，并与在新墨西哥州阿尔伯克基测量的夏季中午太阳光谱进行了比较。提出的光谱限值是在以320纳米处归一化的该标准光谱为中心的6纳米“接受带”。结果表明，美国目前用于测试防晒霜的氙弧太阳模拟器要么符合提议的标准太阳光谱，要么可以通过现有的UV滤光片轻松修改以符合该标准。光谱特性与阳光不同的设备不符合提议的标准，不应用于防晒霜SPF测试。
