Radiation Ultraviolet

Ultraviolet radiation is electromagnetic radiation that falls between visible light and x-rays. It has a wavelength of 100 to 400 nm and is highly energetic.

Ultraviolet radiation has many applications in various fields such as medicine, industry, science and technology. For example, in medicine, ultraviolet radiation is used to treat various skin diseases, such as acne, psoriasis and others. Ultraviolet radiation is also used to sterilize medical instruments and equipment.

Ultraviolet radiation is also widely used in industry. For example, it is used to produce plastics, rubber and other materials. In addition, ultraviolet radiation can be used to purify water and air from various contaminants.

However, long-term exposure to ultraviolet radiation on the skin can lead to various diseases such as skin cancer. Therefore, precautions must be taken when working with ultraviolet radiation.

Thus, ultraviolet radiation is an important element in our lives and has wide application in various fields. However, you must remember to take precautions and not overuse it.

Ultraviolet radiation is electromagnetic radiation that occupies the spectral range between visible and x-ray radiation, as well as a penetrating electromagnetic wave with a wavelength from 40 to 200 nm without significant absorption. Ultraviolet rays were discovered in 1801. A study of the physical spectrum of sunlight showed the emergence of a new region bordering the green part of the spectrum. This mysterious spot was already familiar to William Herschel, who, together with Rayleigh, discovered the Fraunhofer stripes. The French physicist Mayer proved the identity of these two phenomena. Their source turned out to be sunlight. The discovery of new radiation led to the expansion of the meaning of this term. In various fields of natural science, the expression “ultraviolet rays” began to be used, interpreting it in different ways. In astronomy, it denotes the part of the spectrum with the longest wavelength - the part of the long-wave end of the light spectrum that is invisible to the naked eye, located between violet light and x-rays. But more often this term is used by scientists to designate the spectral region of visible light with a wavelength of 300 to 400 nanometers. The wavelength of ultraviolet radiation is the part of the spectrum that exceeds the boundary (extreme point) of the range visible to humans. Ultraviolet is the same as the sun. Stellar astronomer E. Barnard came to this conclusion after studying the spectrum. Studies have shown that the intensity of visible and ultraviolet radiation from celestial bodies is seven times less than the sun, and in the range from 0.1 to 0.5 nm the light flux is not detectable at all. These conclusions were explained then based on ideas about the nature of stars, since it turned out to be impossible to imagine sources of such weak radiation. Outside the Earth, a distant nebula in the southern constellation was discovered, which was observed in the ultraviolet range. Now it became clear why it was discovered so late, because the radiation sources were at the end of the spectrum. New discoveries of this remarkable spectrum followed one after another. The radiation detected with mercury lamps became known as short-wave ultraviolet. To obtain visible parts of the spectrum, arc lamps and backward wave lamps are used. This method produces maximum visible ultraviolet light. If a mercury lamp is charged with a flow of electrons in the opposite direction, and the temperature of the cathode is selected correctly, the metal begins to glow, emitting intense yellow-green radiation. When the cathode is cooled, the metal atoms are excited by ultraviolet radiation and cause radiation of even higher frequencies; additional energy falls on the same electrons in the phosphorus atoms, and they go into state. Transformed and passed through the lens, these violet waves are absorbed by iodine vapor and excite hydrogen to the fourth power. Amethyst liquid with metallic hydrogen, filtering ultraviolet light, converts violet flux into visible light. It reaches the observer's eye in a completely different way than ultraviolet rays. The spectrum of stars, invisible to the eye 70 years earlier, is called bactericidal. Germicidal light rays is defined as a result result