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太阳紫外辐射是位于X光与可见光之间的电磁辐射,它的波长介于100nm～400nm(nm是长度的单位,1nm=10~(-9)m)之间。科学家根据波长把太阳紫外辐射光谱分A波段(320～400nm)、B波段(280～320nm)和C波段(100～280nm)三部分。由于C波段的太阳紫外辐射受到平流层内臭氧层的强烈吸收,几乎不能到达地球表面,但太阳紫外辐射A波段和B波段却能穿过大气层直射地面,对人体健康有不可忽视的影响。太阳辐射中的紫外线可以促进人体内维生素D的形成,适当地
Solar ultraviolet radiation is electromagnetic radiation located between X-rays and visible light, and its wavelength is between 100 nm and 400 nm (nm is a unit of length, 1 nm=10-9 m). Scientists according to the wavelength of solar ultraviolet radiation spectrum divided into A band (320 ~ 400nm), B band (280 ~ 320nm) and C band (100 ~ 280nm) three parts. Because the C-band solar ultraviolet radiation is strongly absorbed by the ozone layer in the stratosphere and can hardly reach the surface of the earth, the solar ultraviolet radiation A-band and B-band can pass through the atmosphere directly to the ground, which has a non-negligible impact on human health. The ultraviolet rays in solar radiation can promote the formation of vitamin D in the human body.