To combat the COVID-19 epidemic, in addition to the usual masks, alcohol, goggles, UVC germicidal lamps are also an effective epidemic prevention material.
The strongest disinfection effect in the deep ultraviolet wavelength
UV disinfection and sterilization are ancient and proven methods. The sun under the quilt is the most primitive use of UV mites, disinfection, and sterilization.
Li Jinmin, director of the State Key Laboratory of Joint Innovation in Semiconductor Lighting, said the principle of UV disinfection and sterilization is to use high-energy UV light to break the DNA double helix chain, thereby achieving the inactivation of bacteria and viruses. UVC to achieve effective disinfection needs to meet certain requirements, pay attention to the wavelength of the UV light source, irradiation dose, and time, that is, it must be a wavelength of 280nm below the UVC band of deep ultraviolet light, for different bacteria and viruses to meet a certain irradiation dose and time, otherwise, it can not inactivate.
According to Yan Jianchang, a researcher at the Institute of Semiconductors of the Chinese Academy of Sciences, according to the wavelength division, the UV band can be divided into UVA, UVB, UVC different wavelengths. UVC is the shortest wavelength with the highest energy, in fact, for germicidal disinfection, the most effective is really UVC, which is known as the deep ultraviolet band. Compared to chemical disinfection, UVC has the advantage of high germicidal efficiency, inactivation is generally completed within a few seconds, and does not produce other chemical contaminants.
UVC can also inactivate microorganisms. Homes can purify water by installing a UVC water purification system, and air purifiers equipped with UVC lamps can render harmless the bacteria floating in the air. Sewage treatment plants, food plants, breweries, beverage plants, etc. also use UVC sterilization.
UVC germicidal lamps to be purchased on demand
UVC germicidal lamps can be divided into double-ended lamps, single-ended lamps, and self-ballasted lamps according to the shape of the three categories, according to whether the type of ozone is divided into two types of ozone-containing and non-ozone-containing.
China Household Electric Appliance Research Institute Health Appliance Testing Center engineer Wang Di said, in crowded places and indoors try not to use ozone lamps. Consumers in the purchase of UV germicidal lamps, pay attention to the relationship between UV intensity and the size of the space. Usually, each cubic meter of space requires 1.5W of UVC germicidal lamps, users can choose the appropriate power size of the product according to the actual situation at home.
UVC germicidal lamps are usually used in places where bacteria can easily breed, such as kitchens, bathrooms, and other dark and humid places, and can also be used in spaces with high environmental quality requirements, such as wards, operating rooms, and other medical places. UVC germicidal lamps are now also widely used in some electrical products, such as air purifiers, fresh air machines, clothing care machines and other indoor purification devices, and clothing care disinfection devices.
It should be reminded that UVC lamps have a certain life span and should be replaced in time for use. According to the requirements of GB/T 19258-2012 standard, the life of UV lamps is not less than 5000h, with an average life of 8000h, and high-performance products can reach more than 10,000 hours. Wang Di recommends that consumers, every 1-2 years to replace, and every two weeks to wipe the outer surface of the lamp with alcohol to ensure the intensity of UV radiation.
Use UVC germicidal lamps to master the skills
Due to the destructive effect of UV light on biological cells, when using UVC germicidal lamps should be careful not to directly irradiate the human skin, and not directly with the eyes to look directly at the lamp.
Under the premise of ensuring safety, how to use UVC germicidal lamps scientifically and effectively? Wang Di said, to pay attention to the location, to create the best use of the environment, while paying attention to the length of use.
First, due to ultraviolet light in the air penetration ability being very weak, it is difficult to achieve long-distance germicidal ability, so when using to try to be placed in the main germicidal location, such as the middle of the room, or easy to breed bacteria, 1.5m-2m away from the surrounding appropriate.
Second, when using to pay attention to the impact of the use of environmental sterilization effect. Usually, the temperature between 27 ℃ to 40 ℃ between the maximum output strength of ultraviolet light, sterilization effect is the best, in addition, to ensure the use of a clean and dry environment, a large amount of moisture and dust in the environment will have interference and weakening effect on ultraviolet light, reducing the actual UV intensity. When used at home, try to close the doors and windows, draw the curtains, close the lights, to ensure that the room is in darker conditions, more conducive to the germicidal effect of ultraviolet light, for easy to breed bacteria and other microorganisms, such as bed quilt, you can expand the bed quilt, increasing the contact area, more conducive to the sterilization of ultraviolet light.
Third, the UVC germicidal lamp in use should ensure adequate UV irradiation time. Research shows that after 5 minutes of irradiation, for effective germicidal disinfection time, when it reaches 30 minutes, it can reach the daily disinfection effect, when the irradiation time reaches 60 minutes, it can kill the vast majority of bacteria and other microorganisms in the air.
In short, in daily life, “go out less, do not gather, hand washing, more ventilation” is still the lowest cost, the most effective means of epidemic prevention. In the face of the epidemic, the use of ultraviolet germicidal lamps for sterilization must be scientific and reasonable norms, and to attach great importance to the use of safety.
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