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[目的]利用人体头部模型模拟研究不同地理朝向时眼部紫外辐射的暴露量及其时间分布。[方法]使用自制的安装有高紫外灵敏度光纤光谱仪的眼紫外线暴露模型在中国三亚地区进行实地监测,起始方位是模拟眼部正对南方向,顺时针旋转监测,每隔6°自动监测一次,获得大量对应不同地理朝向的眼部暴露紫外辐射数据。[结果]东向和西向眼暴露长波紫外光(UVA)分别在上午9:00和下午16:15(~50°太阳天顶角)左右达到最大值,分别为2 324.88μW/cm~2和2 442.68μW/cm~2,眼暴露中波紫外光(UVB)分别在上午9:45和下午15:50(~40°太阳天顶角)左右达到最大值,分别为93.83μW/cm~2和92.54μW/cm~2;南向和北向眼暴露UVA和UVB峰值均出现在正午12:00(~7°太阳天顶角)左右,分别为1 056.09μW/cm~2和61.45μW/cm~2。眼部暴露紫外辐射最大辐照度在地理朝向上的分布是正东偏北和正西偏北12°左右。东向和西向最大剂量百分比分别出现在9:00—10:00和15:00—16:00,为19.67%和17.11%,南向和北向最大剂量百分比均出现在12:00—13:00,为12.68%和12.98%。[结论]不同地理朝向时眼部紫外辐射高暴露的时间段各不同。
[Objective] To study the exposure and time distribution of ultraviolet radiation in the eyes of different geographical orientations using human head model. [Method] The self-made eye UV exposure model with high UV sensitivity fiber spectrometer was used to carry out on-the-spot monitoring in Sanya, China. The starting position was to simulate the eye facing the south direction and clockwise rotation monitoring, , A large number of eye exposure UV radiation data corresponding to different geographical orientations were obtained. [Result] The results showed that the longwave ultraviolet (UVA) exposure in the east and west eyes reached the maximum around 9:00 am and 16:15 pm (~ 50 ° solar zenith angle) respectively, which were 2 324.88 μW / cm ~ 2 and 2 442.68μW / cm ~ 2, the UVB of eyes exposed reached the maximum around 9:45 am and 15:50 pm (~ 40 ° solar zenith angle) respectively, which were 93.83μW / cm ~ 2 And 92.54μW / cm ~ 2, respectively. The peak values of UVA and UVB in the south and north eyes were all around 12:00 noon (~ 7 ° solar zenith angle), which were respectively 1 056.09μW / cm 2 and 61.45μW / cm ~ 2. The distribution of the maximum irradiance of ultraviolet radiation exposure to the eye in the geographic direction is northerly eastward and about 12 ° north-northwest. The maximum dose percentage in the east and west directions appeared at 19.67% and 17.11% at 9: 00-10: 00 and 15: 00-16: 00 respectively, and the maximum dose percentage in the south and north directions appeared at 12: 00-13: 00 , 12.68% and 12.98% respectively. [Conclusion] The time periods of high ultraviolet radiation exposure in different orientations are different.