Wavelength classification and application fields of ultraviolet light According to the different biological effects, ultraviolet rays are divided into four wavelength bands according to wavelength: long-wave UVA, medium-wave UVB, short-wave UVC, and vacuum UVD. The longer the wavelength, the greater the penetration.
UVA
Long wave UVA, with a wavelength ranging from 320 to 400 nanometers, is also known as long wave black spot effect ultraviolet radiation. Has strong penetrating power, able to penetrate glass, even up to 9 feet of water; And it exists throughout the year, regardless of whether it is cloudy or sunny, day or night.
Harm to human body: More than 95% of the ultraviolet rays that daily skin comes into contact with are UVA, so it causes the greatest damage to the skin. UVA can attack the dermis through the epidermis, causing severe damage to collagen and elastin in the skin; Moreover, dermal cells have poor self-protection ability, and a small amount of UVA can cause great harm. Over time, the skin develops problems such as looseness, wrinkles, and the appearance of microvessels.
At the same time, it can also activate tyrosinase, leading to immediate melanin deposition and the formation of new melanin, making the skin black and lacking luster. UVA can cause long-term, chronic, and long-lasting damage, leading to premature aging of the skin, hence it is also known as aging radiation.
Application field: UVA ultraviolet radiation with a wavelength of 360nm conforms to the phototactic response curve of insects and can be used to make insect traps. UVA ultraviolet rays with wavelengths of 300-420nm can pass through specially colored glass tubes that completely cut off visible light, emitting only near-ultraviolet light centered at 365nm. They can be used for ore identification, stage decoration, currency verification, and other places.
