UV-A
Long-wave UV-A, with a wavelength between 320 and 400 nanometers, is also known as long-wave black spot effect ultraviolet rays. It has strong penetrating power, can penetrate glass, even 9 feet of water; and it exists in all seasons of the year, whether it is sunny or sunny.
Damage to the human body: More than 95% of the ultraviolet rays exposed to the skin are UV-A, so it is the most harmful to the skin. UV-A can penetrate the epidermis to attack the dermis, causing serious damage to the collagen and elastin in the skin; and the dermal cells have poor self-protection ability, and a small amount of UV-A can cause great damage. Over time, skin problems such as relaxation, wrinkles, and capillaries appear.
At the same time, it can activate tyrosinase, leading to instant melanin deposition and the formation of new melanin, making the skin darker and lacking luster. UV-A can cause long-term, chronic and lasting damage, and make the skin age prematurely, so it is also called aging rays.
Application field: UV-A ultraviolet rays with a wavelength of 360nm conform to the phototaxis response curve of insects, and can be used to make insect trap lamps. UV-A ultraviolet rays with a wavelength of 300-420nm can pass through a special colored glass tube that completely cuts off visible light, and only radiates near-ultraviolet light centered at 365nm. It can be used for ink glue curing, ore identification, stage decoration, currency verification, and other fields.
UV-B
Medium-wave UV-B, with a wavelength between 275 and 320 nanometers, is also known as medium-wave erythema effect ultraviolet rays. Medium penetration, the shorter wavelength part will be absorbed by the transparent glass, most of the medium-wave ultraviolet contained in the sunlight is absorbed by the ozone layer, and only less than 2% can reach the surface of the earth, which is particularly strong in summer and afternoon.
Damage to the human body: It will oxidize the protective lipid layer of the epidermis and dry the skin; further, it will denature the nucleic acid and protein in the epidermal cells, causing symptoms such as acute dermatitis (ie sunburn), and the skin will turn red Pain. In severe cases, such as prolonged exposure, it can easily lead to skin cancer. In addition, the long-term damage of UV-B can also cause the mutation of melanocytes, resulting in sunspots that are difficult to eliminate.
Application areas: UV health care lamps and plant growth lamps emit special violet glass (not transmit light below 254nm) and phosphors with a peak near 300nm.
UV-C
Short-wave UV-C, with a wavelength between 200 and 275 nanometers, is also called short-wave sterilizing ultraviolet light. Its penetrating ability is the weakest, unable to penetrate most of the transparent glass and plastic. The short-wave ultraviolet rays contained in sunlight are almost completely absorbed by the ozone layer and are absorbed by the ozone layer before reaching the ground.
Damage to the human body: UV-C in nature is absorbed by the ozone layer before reaching the ground, and its impact on the skin can be ignored, but in fact, short-wave ultraviolet rays are very harmful to the human body and cannot be directly irradiated to the human body. If it is directly irradiated, short-term irradiation can burn the skin, and long-term or high-intensity irradiation can also cause skin cancer.
Application areas: UV-C short-wave ultraviolet light emitted by the ultraviolet germicidal lamp. Shortwave ultraviolet rays are widely used in hospitals, air conditioning systems, disinfection cabinets, water treatment equipment, drinking fountains, sewage treatment plants, swimming pools, food and beverage processing and packaging equipment, food factories, cosmetics factories, dairy products factories, wineries, beverage factories, Areas such as bakeries and cold rooms.