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光线对于致病菌有致死的作用,散射的光线对細菌影响很小,而直射光线几小时就能杀死微生物。細菌对紫外綫的感受性是很敏感的,因此紫外线对于一般细菌的杀伤力也是比較强的,常用的低压氩汞灯,其幅射光谱主要集中于波長260mμ左右区域,其灭菌作用最高。在药房裝有紫外光灯的無菌操作室中,經过照射一定时間后,空气中的細菌数会显著的降低;至于影响空气含菌数的因素,除了紫外线的照射量外,同时也决定于微生物的种类,室內空气流动情况、湿度、含尘量等。
Light has a lethal effect on pathogens, the scattered light has little effect on the bacteria, and the direct light can kill microbes in hours. Bacteria are very sensitive to ultraviolet light sensitivity, so the UV for the general bacterial lethality is relatively strong, commonly used low-pressure argon mercury lamp, the radiation spectrum is mainly concentrated in the wavelength of about 260mμ area, the highest sterilization. In the aseptic room equipped with UV light in the pharmacy, after a certain period of irradiation, the number of bacteria in the air will be significantly reduced. As for the factors that affect the number of airborne bacteria, in addition to the amount of ultraviolet radiation, it also determines In the type of microorganisms, indoor air flow, humidity, dust content.