What Is an Ultraviolet Lamp?

What Is an Ultraviolet Lamp?

An ultraviolet lamp produces electromagnetic radiations (EMR) in the wavelengths between visible light and X-rays.ultraviolet lamp Its spectral output can be tuned to produce different EMR frequencies by adding different metallic elements (doping) to the core of the bulb. It may be housed in quartz or other special glass that transmits UV rays more readily than ordinary glass. A typical UV lamp contains an inert gas such as argon or krypton mixed with mercury, and when an electric current passes through it, the atoms of these gases ionize, emitting UV rays. This light is often used in medical settings to disinfect surfaces and objects. It is also a commonly used light source for creating a fluorescence in some substances such as certain fabrics or dyes.

The germicidal effects of UV light are well documented, but it is usually not recommended to expose the skin to UV rays because long-term exposure can cause sunburn, and may increase the risk of cancer or other forms of skin disease.ultraviolet lamp In medical settings, UV light is usually shone through a filtered device called a Wood's lamp to detect a number of conditions including porphyrins associated with some diseases.

A new type of UV lamp that emits only far-UVC spectrum radiation appears to be safe for humans and significantly reduces the level of airborne bacteria in a room, according to a study conducted by researchers at Columbia University Vagelos College of Physicians and Surgeons and in Scotland.ultraviolet lamp The researchers tested commercially available overhead far-UVC lamps that do not generate ozone in the process of sterilizing the air. They found that the lamps inactivated more than 98% of a aerosol mist of S. aureus bacteria in less than five minutes, and the low levels remained even while the lights were turned on.

Other types of UV lamps are used to illuminate fabrics and other materials that fluoresce in the presence of UV rays.ultraviolet lamp This allows people to see how the material reflects or absorbs UV light, and it is a useful tool for quality control in the textile and manufacturing industries. Such fluorescent UV radiation is also used to create a "black light" effect in theaters, clubs and other entertainment venues that display images painted with bright colors on black velvet or other dark fabric. The luminescence of the fabrics intensifies the colors, making them more vivid. This technique is also used in sensory rooms for children with profound and multiple learning difficulties.

Several industrial processes use UV radiation to cure or sterilize materials, such as plastics and rubbers; harden or soften paint; treat woods and other natural products; and clean drinking water. Many of these processes are now being replaced with more environmentally friendly technologies, but UV radiation remains useful for some applications, such as treating sewage before it is released into the environment.

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