Radio waves that transmit sound from a radio station’s tower to your stereo, or between cell phones microwaves, like those that heat your food in a microwave oven visible light that is emitted from the lights in your home and X-rays like those used in hospital X-ray machines to capture images of the bones inside your body, are all forms of EM energy. UV radiation is only one type of EM energy you may be familiar with. UV radiation is only one form of radiation and it is measured on a scientific scale called the electromagnetic (EM) spectrum.
Its penetrating ability is extremely weak. UVD, with a wavelength of 100~200nm, is also called vacuum ultraviolet. The 254nm ultraviolet light has a good sterilization effect, so it is widely used in ultraviolet germicidal lamps.Ĥ. The ultraviolet germicidal lamp emits short-wave UVC ultraviolet rays.
Short-term exposure can burn the skin, and long-term or high-intensity exposure can also cause skin cancer. Short-wave ultraviolet rays are very harmful to the human body. The short-wave ultraviolet rays contained in sunlight are almost completely absorbed by the ozone layer. Its penetrating ability is the weakest, so it cannot penetrate most transparent glass and plastics. UVC, the wavelength is 200 ~ 275nm, also known as short-wave sterilization ultraviolet. Ultraviolet health care lamps and plant growth lamps are made of special glass (which does not transmit light below 254nm) and phosphors with a peak wavelength near 300nm.ģ. However, long-term or excessive exposure will make the skin tanned and cause redness and peeling. UVB ultraviolet rays can cause erythema effects on the human body, and can also promote the metabolism of minerals and the formation of vitamin D in the body. Most of the UVB contained in 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.
Its shorter wavelength will be absorbed by the transparent glass.
UVA ultraviolet rays with wavelengths of 300-420nm can pass through special colored glass tubes that completely cut off visible light, and only radiate the ultraviolet light centered at 365nm, which can be used for ore identification, stage decoration, currency verification and other functions.Ģ. UVA ultraviolet rays with a wavelength of 360nm conform to the phototaxis response curve of insects, and can be used to make insect trap lamps. UVA can directly reach the dermis of the skin and destroy elastic fibers and collagen fibers, and tan our skin.
More than 98% of the long-wave ultraviolet rays contained in sunlight can penetrate the ozone layer and clouds to reach the surface of the earth. It has strong penetrating power and can penetrate most transparent glass and plastics. And the following article will explain the difference in detail for you.ġ. For example, can you tell the difference between UVA, UVB, UVC, UVD? First, the conclusion is that you should use UVC disinfection lamp for sterilization and disinfection in daily life. But most consumers have very little understanding of UV. Everyone knows that ultraviolet rays have a sterilization function.