In order to more intuitively understand the damage of ultraviolet rays to the human body, let me first introduce some basic knowledge about ultraviolet rays (UV). Ultraviolet light (UV) consists of three brothers: UVA/UVB/UVC. Each band has a different personality. Only UVA and UVC are carried out here; 254nm belongs to the UVC band, and 365nm belongs to the UVA band. Although ultraviolet light has a short wavelength, it has high energy. The two have different effects on the human body, so I will talk about them separately.
The sterilization capabilities of ultraviolet rays in different wavelength bands are 254nm: 254nm is the band with the best sterilization effect. It belongs to the deep ultraviolet band, which is what we usually call UVC. This band is mainly used for sterilization. UVC can kill more than 99% of bacteria in a very short time by destroying genetic material such as DNA of bacteria and viruses, changing the genetic transcription characteristics of cells, causing organisms to lose their ability to synthesize proteins and replicate and reproduce. You need to be extra careful when coming into contact with this band in daily operations, as it can cause serious harm to the human body. Especially in the eyes, after UVC is absorbed by the cornea, the DNA of the corneal epithelial cells is damaged, the cells die, and the underlying nerve plexus is exposed. When the nerve is exposed, pain is transmitted directly to the brain until new corneal epithelial cells grow back to cover the nerve plexus. However, although UVC's force value is very strong, it also has weaknesses. Its biggest disadvantage is its weak penetrating ability, which can be blocked by ordinary plastic and glass. If you are accidentally exposed to ultraviolet rays in this range, it is best to go to the hospital and ask a doctor for advice.
After talking about 254nm, let's talk about 365nm: 365nm is UVA, which is light ultraviolet light. UVA can pass directly through clouds and reach the earth, so the sun we come into contact with every day contains a lot of UVA. This band is mainly used for curing in daily life, and its main application areas are printing, nail art, textiles, etc. The light we use when looking at teeth uses UVA.
Compared with UVC, UVA is relatively mild and will not cause acute damage to the eyes. But the dangers are tanning and wrinkled skin, accelerating the progression of cataracts and age-related macular degeneration. Therefore, for the 365nm ultraviolet lamp, take sun protection and do not look directly into your eyes!
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