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Application of UV germicidal lamp in protecting the spread of new coronavirus

1. The concept of ultraviolet lamp and ultraviolet radiation

Ultraviolet lamps, like desk lamps, ceiling lamps and street lamps for daily lighting, are electric light source products whose main function is to generate light radiation. The difference between the ultraviolet germicidal lamp and the daily lighting lamp is that the light radiation of the daily lighting lamp is visible light, and the wavelength of the light radiation is usually 380nm-780nm, and the light radiation of the ultraviolet germicidal lamp is in the ultraviolet band.

Ultraviolet (UV, referred to as UV) radiation refers to light radiation with a wavelength in the range of 100nm-400nm. The ultraviolet radiation with a wavelength range of 315-400nm is called UVA, and the ultraviolet radiation with a wavelength range of 280-315nm is called UVB, and the wavelength range is 100 -280nm ultraviolet radiation is called UVC[1]. Different wavelengths of ultraviolet radiation have different uses. UVC is the ultraviolet radiation band used for sterilization. Usually referred to as ultraviolet germicidal lamp mainly refers to the ultraviolet lamp with the central wavelength of light radiation of 253.7nm.

Note 1: uv sterilizer with a wavelength of 185nm also has relevant application studies and cases in the field of sterilization. According to the national standard, the ultraviolet radiation center wavelength of the ultraviolet germicidal lamp is 253.7nm.

2. Broad-spectrum sterilization and disinfection of ultraviolet radiation

Studies have shown that ultraviolet rays mainly kill microorganisms through radiation damage to microorganisms (bacteria, viruses, spores and other pathogens) and the function of destroying nucleic acids, thereby achieving the purpose of disinfection [4]. The killing effect of ultraviolet radiation on bacteria and viruses has been verified on common bacteria and viruses, such as tuberculosis (myco) bacillus, Vibrio cholerae, Pseudomonas, Salmonella, Intestinal fever bacteria, Typhimurium Bacillus, Shigella, Staphylococcus, Streptococcus, Escherichia coli, viruses such as influenza virus, polio virus, rotavirus, tobacco leaf virus, hepatitis B virus, mold spores such as soft spores, penicillin Bacteria, Penicillium toxin-producing, Penicillium and other fungi, algae such as Paramecium, Chlorella, Protozoa [5], therefore, ultraviolet radiation is a broad-spectrum sterilization method.

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3. the infection protection of the new coronavirus in 2019

From the perspective of epidemiology, the infection of the 2019 new coronavirus is mainly transmitted from pathogen carriers to susceptible people and infected by respiratory droplets. From the perspective of transmission channels, the infection protection of the 2019 new coronavirus is considered from the following three aspects:

The source of infection perspective: isolation.

The angle of transmission: physical protection or killing.

The perspective of susceptible people: improve immunity.

Wearing a mask and using alcohol/disinfectant/ultraviolet radiation to sterilize the environment and objects are measures to cut off the transmission route. Among them, masks and other methods belong to partition protection, and alcohol wiping, spraying disinfectant and ultraviolet germicidal lamp sterilization and disinfection methods belong to Ways to kill viruses.

In terms of killing viruses, ultraviolet germicidal lamp sterilization is compared with the disinfection method of alcohol wiping and spraying disinfectant lamp:

The same point: all belong to the broad-spectrum disinfection method.

Differences: There are differences in usage and operating convenience.

4. the effectiveness of coronavirus and UV germicidal lamps

There are many types of coronaviruses. The virus that causes the common cold, the SARS virus that caused SARS in 2003 (SARS-CoV), and the 2019 new type of coronavirus (2019-nCoV) discovered this time are all coronaviruses. Different types of coronaviruses cause disease. The strength and clinical manifestations are also different. The 2019-nCoV discovered this time is the seventh coronavirus known to infect humans.

Viruses are sensitive to ultraviolet rays and heat. As mentioned above, ultraviolet radiation has broad-spectrum killing effects on viruses based on nucleic acid damage. During the SARS period in 2003, studies have also shown that ultraviolet radiation can kill SARS coronavirus in vitro. Therefore, 2019 As a (corona) virus, the novel coronavirus can theoretically be killed by ultraviolet radiation.

The ultraviolet radiation dose that can kill the virus is related to the following factors:

The total amount of ultraviolet radiation depends on the radiation time and radiation intensity;

The external environmental conditions in which the virus is located, including environmental temperature and humidity;

The attachment between the virus and the body and the penetration of ultraviolet radiation.

5. Precautions and suggestions for the use of ultraviolet radiation

While UV radiation kills bacteria and viruses, its radiation is also harmful to human skin and eyes. Therefore, when installing and using UV radiation to ensure that its radiation dose can achieve sterilization and disinfection, it should be ensured that: Use under (avoid exposure to the human body)

Based on the sterilization and disinfection effect of ultraviolet radiation and the human body, the following suggestions are put forward for its installation and use:

Consider using ultraviolet germicidal lamps to sterilize items that may carry pathogens;

Consider using UV germicidal lamps to disinfect the environment under unmanned conditions to kill pathogens that may be attached to the air suspension and the surface of the object;

Consult professionals to provide installation suggestions to ensure that the space layout of the UV disinfection lamp can reach the sterilization dose.

6. summary

Ultraviolet radiation represented by the central wavelength of 253.7nm has a broad-spectrum killing effect on bacteria and viruses. Its effectiveness has been verified by experiments on the SARS virus. Theoretically, based on the nucleic acid destruction effect of ultraviolet radiation, a certain dose of ultraviolet radiation can be To kill the 2019 novel coronavirus, use the ultraviolet germicidal lamp under unmanned conditions, and its sterilization and disinfection effect can achieve the purpose of infection protection by destroying the way of transmission.

Due to the harmfulness of ultraviolet radiation to the human body, from the perspective of the effectiveness of the 2019 new coronavirus infection protection practice, other realities should also be considered, such as the situation where pathogens are hidden in the environment and cannot be killed by ultraviolet radiation; multiple people have entered In the environment where the sterilization is completed, individual humans carry pathogens and then spread to other people, continue to pollute the environment, etc. For the general population, it is also necessary to comprehensively consider the practical comparison of ultraviolet radiation sterilization and other disinfection methods such as alcohol and disinfectant.