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日光中的紫外线因具有消毒杀菌、刺激皮肤促进血液循环及某些生物学作用,一直被认为有利于人体健康的功臣。近年来随着紫外线对皮肤损害的研究深入,人们对它产生了新的理解和认识——有功也有过。日光中的可见光部分,其光谱约在390～770毫微米,紫外线的波长在200～390毫微米范围内,其中340～390毫微米为紫外光谱A(UVA),290～340毫微米为U-
The ultraviolet rays in sunlight have been considered to be beneficial to human health because of their ability to sterilize and sterilize, stimulate the skin to promote blood circulation and certain biological effects. In recent years, with the deep research on ultraviolet damage to the skin, people have gained a new understanding and understanding of it - there have been meritorious achievements. The visible part of sunlight has a spectrum of about 390 to 770 nanometers, and the wavelength of ultraviolet rays is in the range of 200 to 390 nanometers, of which 340 to 390 nanometers are ultraviolet spectrum A (UVA), and 290 to 340 nanometers are U-