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地球上的绝大部分生物,尤其是人类的生存,都离不开太阳光。阳光中包含紫外辐射(ultra-violet radiation,UVR),俗称紫外线或紫外光。紫外线波长为100nm～400nm,最短波长与电离辐射相交,最长波长处与可见光相接。根据一般规律,波长愈短能量愈大,生物学作用愈强,紫外辐射也不例外。根据 UVR 的波长和不同的生物学作用,分成三个波段:UVA 波长320nm～400nm,UVB 波长275nm～320nm,UVC 波长230nm～275nm。后者存在于真空中,在地球表面很快被空气吸收,天然环境中几乎不存在。
Most living things on earth, especially human beings, are inseparable from the sun. Sunlight contains ultra-violet radiation (UVR), commonly known as UV or UV light. UV wavelength of 100nm ~ 400nm, the shortest wavelength and ionizing radiation intersection, the longest wavelength and visible light phase. According to the general law, the shorter the wavelength the greater the energy, the stronger the biological role, ultraviolet radiation is no exception. According to the UVR wavelength and different biological effects, divided into three bands: UVA wavelength 320nm ~ 400nm, UVB wavelength 275nm ~ 320nm, UVC wavelength 230nm ~ 275nm. The latter exists in a vacuum and is rapidly absorbed by the air on the Earth’s surface, with little remaining in the natural environment.