什么是紫外线
紫外线(UV)是电磁辐射的一种形式,介于 可見光 和 X 射线 電磁頻譜.它的波长比可见光短,能量比可见光高,因此人眼看不见。紫外线根据波长可分为三种类型:UVA、UVB 和 UVC。
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UVA 在三种类型中波长最长,对人体的伤害最小。它能使人晒黑,常用于日光浴浴床。UVB 波长较短,可导致晒伤和皮肤损伤。长期暴露在 UVB 辐射下会增加患皮肤癌的风险。紫外线波长最短,对生物体的危害最大。幸运的是,大部分紫外线辐射会被地球大气层吸收,不会到达地表。
紫外线是由太阳自然发出的,对人体产生各种影响。它是产生维生素 D 的必要条件,而维生素 D 对骨骼健康非常重要。然而,过度暴露在紫外线下会导致有害影响,如晒伤、过早衰老和增加患皮肤癌的风险。
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在照明行业,紫外线有多种应用。杀菌灯使用 UVC 光 杀灭或灭活细菌、病毒和霉菌等微生物。这些灯通常用于医疗和研究设施以及水和空气净化系统。紫外线还可用于法医调查,在犯罪现场识别和分析血液等生物材料。它可以提高某些在正常照明条件下不易察觉的物质的可见度。此外,紫外线还用于食品和水的卫生处理,以消除有害微生物,降低污染风险。


















