Broad-Spectrum Ultraviolet (UV) Radiation and UVA, and UVB, and UVC .

December 13–14, 2000 . The UVC range is absorbed by DNA and thus can cause cancer and mutations. Prepared for the: U.S. Department of Health and Human Services Public Health Service National Toxicology Program Research Triangle Park, NC 27709 .

Visible wavelengths cover a range from approximately 400 to 800 nm.

This chart is intended for those who want to have a better grasp of the UV wavelengths. Optical radiation with wavelengths shorter than 400 nm is called ultraviolet (UV) radiation and is further subdivided in UV-A, UV-B and UV-C ranges. The Vacuum UV range is absorbed strongly by water and air and thus can only be transmitted in a vacuum. UVA1 phototherapy: a review of mechanism and therapeutic application. II.2. Over 98% of the UV radiation reaching the ground is UVA and less than 2% is UVB. UVC 290 nm - 100 nm. Fig. The UV region covers the wavelength range 100-400 nm and is divided into three bands: UVA (315-400 nm) UVB (280-315 nm) UVC (100-280 nm). Medium-wavelength UVB is very biologically active but cannot penetrate beyond the superficial skin layers. Common uses for UVA include: Curing inks, coatings and adhesives; UV inspection; UV fluorescing ; UVB Wavelengths UVB has a mid-range wavelength measuring 280 nm to 320 nm … Ultraviolet germicidal irradiation (UVGI) is a disinfection method that uses short-wavelength ultraviolet (ultraviolet C or UV-C) light to kill or inactivate microorganisms by destroying nucleic acids and disrupting their DNA, leaving them unable to perform vital cellular functions.

UV (Ultraviolet) Light refers to the region of the electromagnetic spectrum between visible light and X-rays, with a wavelength falling between 400 and 10 nanometers.

However, it is completely filtered by the atmosphere and does not reach the earth's surface. The UVA range causes sun tanning in the human skin. Effect of Intensity and Wavelength of Spectral UV Light on Discoloration of Laminated Glass/EVA/PPE PV Module Yadong Lyu, Li-Chieh Yu, Chiao-Chi Lin, Deborah Stanley, and Xiaohong Gu Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA Introduction Experiments Correlation between YI growth and UVA loss Effect of UV Wavelength …

UV-A light (320-400nm) is UV light with the longest wavelength, and the least harmful. The UVB range causes sun burning. This is also the range that is most effective in inactivating bacteria and viruses.

Ultraviolet radiation lies between visible light and X-rays along the electromagnetic spectrum. For example, the US Food and Drug Administration (FDA) and the US Environmental Protection Agency (EPA) define the UV-A range as being between 320 nm and 400 nm. As sunlight passes through the atmosphere, all UVC and approximately 90% of UVB radiation is absorbed by ozone, water vapour, oxygen and carbon dioxide.

Wavelength of Ultraviolet Light Ultraviolet light is light in the range of 10 nm to 400 nm with energies from 3eV to 124 eV. Int J Dermatol 2010 Jun; 49(6):623-30. They pass through the ozone layer and reach the earth. Ultraviolet B (UVB) has a shorter wavelength and is associated with skin  burning. This is also the range that is most effective in inactivating bacteria and viruses. Note: nm means nanometer (400 nm = 400 x 10 -9 meters or 0.0000004 meters) As far as the frequency is concerned I will let you do the math: frequency = speed of light / wavelength.

UV "light" spans a range of wavelengths between about 10 and 400 nanometers. Tuchida C,Lim H et al.Comparison of broad band UVA,narrowband UVA,broadband UVB and narrowband UVB on the activation of apoptotic pathways in human peripheral blood mononuclear cells.Photodermatol Photoimmunol Photomed 2007;23:2-9 Germicidal UVC - shortwave UV, which includes germicidal ultraviolet at 253.7nm wavelength - is used for air, surface and water disinfection. UV radiation reaching the earth's surface consists of UVA and UVB only, as all UVC is absorbed by the atmosphere.

UVGI is used in a variety of applications, such as food, air, and water purification. The wavelength of violet light is around 400 nanometers (or 4,000 Å). Full Wavelength Range From the UVA to the Shortwave Infrared; The SpectralLED® RS-7-2 VIS SWIR Tunable Light Source: 20 Feb 2020 . Ultraviolet light is light or electromagnetic radiation that occurs between the visible spectrum and x-rays.