What is ultraviolet radiation?
ultraviolet radiation (UV) is a specific range of light on the electromagnetic spectrum. It is invisible to people because its range of wavelengths is above the boundary of human perception. It is known that UVS causes burns, but also have beneficial effects on human health. The sun radiates many ultraviolet radiation, but most of it is blocked in achieving the Earth's surface with an ozone layer. UV technology applications are widespread in modern developed countries. He noticed that light with a wavelength just beyond the visible purple light caused a chemical reaction in certain compounds. Electromagnetic radiation is divided into groups on the basis of a properties called wavelength, which is related to the energy content of radiation. The term "chemical rays" was soon admitted to distinguish this new form of light beam. Ultraviolet radiation is TDNES preferred the term and is defined to have a wavelength range of 10 to 400 nanometers.
It is known that UV rays cause burning andSome forms of skin cancer. This occurs when excessive ultraviolet radiation is absorbed by DNA molecules, molecules that contain genetic instructions in living things. This can cause mutations or permanent changes in genetic code. Healthy levels of the UVR exposure differ in various skin pigments, with darker skin capable of absorbing more UV radiation.
Most scientists agree that sunscreen can prevent burns in humans. For a healthy UV exposure, people should use the use of sunscreen with SPF 30 or higher and use it every few hours. Children and young children should be protected from the sun. Sunlight is most intense from 10:00 to 15:00, so the exposure should be limited during these lessons. People who spend a lot of time outside should consider wearing a firmly fabric for special protection.
In spite of its harmful effects, it is assumed to be determined to determineThe level of exposure to UV radiation is beneficial. UV rays that hit the skin can cause vitamin D production, which has an important regulatory function for the nervous system. It is believed that vitamin D helps maintain and grow bone.
ultraviolet radiation can be produced artificially as well as visible light. Sunbed beds use UV rays to create the same effect on the skin as natural sunlight. High UV levels can be used to sterilize or disinfection of surfaces in hospitals and scientific laboratories. In astronomy, UV detection can provide traces to the temperature and the composition of the astronomical object.