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紫外线是指100～400nm(毫微米)波长的电磁波,即紫外辐射。相应的光子能量为3.1～12.4ev。波长短于160nm的紫外线,可被空气完全吸收,只有真空中存在,无实际意义。200～300nm波段的紫外线具有卫生学意义。紫外线对细菌、病毒、真菌、衣原体等均有杀灭作用。自然界中的紫外线见于太阳辐射,对人体代谢发生一系列障碍。故长期在矿井下工作的工人,需在下班后接受紫外线照射。
UV refers to 100 ~ 400nm (nm) wavelength of electromagnetic waves, ultraviolet radiation. The corresponding photon energy is 3.1 ~ 12.4ev. UV wavelengths shorter than 160nm, can be completely absorbed by the air, only the presence of a vacuum, no practical significance. UV 200 ~ 300nm band of health significance. UV on bacteria, viruses, fungi, chlamydia, etc. have a killing effect. The ultraviolet light in nature is found in solar radiation, a series of obstacles to human metabolism. Therefore, long-term workers working in the mine need to receive ultraviolet radiation after get off work.