Wetheter of all ultraviolet rays have a sterilization effect? The answer is no. Ultraviolet rays are divided into long-wave ultraviolet rays, medium-wave ultraviolet rays and short-wave ultraviolet rays. Among these three bands, only short-wave ultraviolet rays have the ability to kill bacteria.
Many people who do not understand ultraviolet rays may think that all ultraviolet rays have a bactericidal effect. The reason for this idea is that in daily life, the most ultraviolet rays we are exposed to are sunlight. Indeed, the ultraviolet rays in the sun have a certain bactericidal effect, but this does not mean that all ultraviolet rays have this effect.
Ultraviolet rays are divided into three types according to wavelength: long-wave ultraviolet, medium-wave ultraviolet and short-wave ultraviolet.
Long-wave ultraviolet, also known as UVA, has a wavelength of 315-400nm. The ultraviolet rays in the sun are almost all UVA, most of the UVA can reach the surface of the earth, and it has the effect of destroying elastic fibers and collagen fibers on people's skin, which is to tan people's skin,but there is no bactericidal effect.
Medium-wave ultraviolet, also known as UVB, has a wavelength of 280-315nm. A small part of the sunlight is UVB, because most of the UVB in the sunlight is absorbed by the ozone layer, and less than 2% can reach the surface of the earth. UVB ultraviolet rays have an erythema effect on the human body, which can cause redness, swelling and molting of the skin. There is also no bactericidal effect.
Short-wave ultraviolet light, also known as UVC, with a wavelength of 200-280nm, is also known as short-wave sterilizing ultraviolet light. Ultraviolet rays in sunlight do not have the UVC band. Ultraviolet rays of this wavelength are extremely harmful to the human body. The wavelength is short and is completely absorbed by the ozone layer. UVC has a strong sterilization ability, and all UVC is sterilized by emitting ultraviolet rays.
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