What is ultraviolet radiation? The ultraviolet rays are a form of electromagnetic radiation emitted by the sun and other sources. They are classified into three main types according to their wavelength. The UV-A, UV-Band UV-C are all happy photons of the light spectrum. These are electro-magnetic wavesbut our eyes cannot see them. They are at the very bottom of the spectrum, opposite infrared.
First of all, let's start with the most abundant by far: the UV-A ! UV-A rays have the longest wavelengths of all UV rays, ranging from around 320 to 400 nanometres (nm). They represent 5 % of solar radiation. Harmless, they can help combat skin diseases.Besides, they are essential to our overall balanceThey cause only a slight tanning of the skin after a few hours' exposure. On the other hand, exposure for more than a few hours a day is not recommended, even though its long-term harmfulness is not clearly known.They are widely used in industrial products: polymerisation of glues, drying in printing and screen printing, drying and polymerisation of nail varnish, fluorescent light in nightclubs, etc.
UV-A is used for its properties bactericide in various applications such as solar disinfection and widely used in developing countries.This is a method for disinfect water using only the sun's rays and polyethylene terephthalate (PET) bottles.This solar disinfection water works by exposing plastic bottles to the sun for several hours to eliminate pathogenic germs. So that this greatly reduces cases of dysenteryfor example.
Then, the rays UV-B have wavelengths ranging from approximately 280 to 320 nm. UV-B is clearly carcinogenic in high dosesThis has led to increasingly strict regulations on tanning booths, particularly in view of the cases of skin cancer.They are responsible for "sunburnThis can happen after just 30 minutes' exposure for fragile skin. UV-B can also damage cellular DNA, which can increase the risk of skin cancer.The atmosphere filters out much of itThis means we can face the midday sun without too much risk. They are very rarely found in commercial products, except for a few reptiles (for reptiles kept in captivity, it is essential to provide appropriate UV-B lighting in order to reproduce their natural environment) and the tanning booths.
It should be noted that UV-B is hardly ever used for water treatmentbecause plastics and glass are opaque
And finally, UV-C rays have the shortest wavelength, ranging from around 100 to 280 nm. UV-C is lethal to humans and just about everything else on the planet. There are none on earth, because the ozone layer blocks them (Let's hope it stays there, otherwise we'll have to live underground...).
Man is able to produce them with the power of mercury lamps or ledsmainly for their effects onBacterial DNA.
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Shenzhen Hechuang Hitech CO., LTD. is a National High-tech Enterprise, which has won a number of invention patent technology awards. We focuses on the Research, Development, Production and Application of UVC-LED Technology. It adopts innovative technologies of revolutionary optics and fluid science, which can kill bacteria and viruses in 0.2 seconds, with a killing rate of 99.9999%. Hechuang Hitech provides safer, more efficient and more humanized sterilization module design for Water Air and Surface Disinfection products.
