Does ultraviolet light kill all bacteria?

Bacteria may appear in any part of the human body. On the surface of the human body, bacterial infections are very likely to occur in the scalp, armpits, genitals, feet and other places. In addition, the respiratory tract, mouth, lungs and stomach are the main places for bacterial infections. There are many ways to kill bacteria now, such as applying some bactericidal ointments, or taking some bactericidal drugs, etc. In addition, everyone knows that ultraviolet rays have a bactericidal effect, so can ultraviolet rays kill all bacteria?

Does ultraviolet light kill all bacteria?

Ultraviolet rays kill microorganisms by destroying their nucleic acids. It is a spectrum sterilization and instant sterilization method. Ultraviolet sterilization is a physical sterilization method that does not produce any by-products. However, the characteristics of ultraviolet rays also mean that they have no continuous sterilization ability. Once the ultraviolet lamp stops working, it loses its sterilization ability.

Ultraviolet rays kill microorganisms by destroying their nucleic acids. They have weak penetrating power and can therefore only kill bacteria on the surface of objects.

Ultraviolet rays are effective against common viruses and bacteria, such as influenza virus, mites, Bacillus maggots, Escherichia coli, hepatitis B virus, Shigella dysenteriae, etc. In addition, it is recommended to use Shellite's ultraviolet germicidal lamp for home use.

Note: 1. As the use time of ultraviolet germicidal lamp increases, the radiation intensity will gradually decline. Generally, the better domestic ultraviolet germicidal lamp needs to be replaced after 5000 hours of use.

2. When using ultraviolet germicidal lamps, attention should be paid to the irradiation distance between the object to be disinfected and the ultraviolet germicidal lamp, that is, the hanging height of the ultraviolet germicidal lamp should be less than 2.5 meters.

3. Avoid looking directly at the light source and avoid long-term exposure to ultraviolet rays, as this can easily cause diseases such as skin cancer.

4. Ordinary glass is almost impermeable to ultraviolet rays. When using ultraviolet rays to disinfect, avoid placing the ultraviolet lamp in a glass cover or close to the glass.

Ultraviolet light is a low-energy electromagnetic wave that has a good bactericidal effect. Ultraviolet light is a broad-spectrum bactericide. It uses ultraviolet light to photolyze and denature bacterial proteins, and destroy and kill the amino acids, nucleic acids, and enzymes of the bacteria. At the same time, when ultraviolet rays pass through the air, they ionize the oxygen in the air to produce ozone, which enhances the bactericidal effect. Therefore, using ultraviolet light can kill almost all bacteria and viruses.

From the appearance, the ultraviolet lamp tube is not much different from the ordinary fluorescent lamp tube, except that the inner wall of the lamp tube is not coated with fluorescent powder and is transparent. But the light it emits is ultraviolet light with a wavelength of 2540A (the strongest sterilization wavelength is 2537A, but the wavelength emitted by commercial ultraviolet lamps is 2540A). At the same time, it can emit low-brightness lavender visible light.