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| ultraviolet radiation | |
|---|---|
| Name | Ultraviolet radiation |
| Type | Electromagnetic radiation |
| Wavelength | 10 nm – 400 nm |
| Frequency | 750 THz – 30 PHz |
| Discovery | 1801 |
| Discoverer | Johann Wilhelm Ritter |
ultraviolet radiation is electromagnetic radiation with wavelengths shorter than visible violet light and longer than X-rays. It was first detected in the early 19th century and has played roles across physics, chemistry, medicine, astronomy, and industry. Researchers, institutions, and instruments from the era of Johann Wilhelm Ritter through projects at NASA, European Space Agency, and observatories such as Palomar Observatory and Keck Observatory have characterized its spectral bands and interactions.
Ultraviolet spans near, middle, and far bands studied by scientists including Heinrich Hertz and instrumentalists at Royal Institution and Max Planck Institute for Solar System Research. Observational programmes like Hubble Space Telescope ultraviolet campaigns, missions such as GALEX and instruments on International Space Station platforms have mapped solar, stellar, and extragalactic UV emission. Historical figures and institutions—Isaac Newton (optics lineage), Joseph von Fraunhofer (spectroscopy heritage), Gustav Kirchhoff (spectral analysis), and laboratories at Massachusetts Institute of Technology and CERN—contributed methods for isolating and measuring UV. Regulatory bodies like World Health Organization and national agencies such as U.S. Food and Drug Administration and European Medicines Agency evaluate UV risks and approvals.
Spectral classification divides UV into bands often labeled UV-A, UV-B, UV-C, and extreme UV; researchers at National Institute of Standards and Technology and standards committees at International Electrotechnical Commission refine definitions. Material scientists at Bell Labs and IBM Research investigate photon energy, photon flux, and absorption cross-sections for elements catalogued since studies by Dmitri Mendeleev influenced interaction models. Quantum theories from Max Planck, Albert Einstein, and Niels Bohr underpin photon energy calculations; solid-state groups at Stanford University and California Institute of Technology examine bandgap interactions in semiconductors such as silicon and gallium nitride. Optical properties—reflectance, transmittance, and refractive indices—are measured by institutes like Fraunhofer Society and companies such as Zeiss and Thorlabs.
Primary natural sources include the Sun—studied by solar observatories like SOHO and missions operated by European Space Agency—and hot stellar objects observed by Chandra X-ray Observatory and Spitzer Space Telescope counterparts. Artificial sources encompass gas discharge lamps developed by firms with roots in Siemens and arc lamp innovations associated with Thomas Edison-era research, as well as mercury-vapor and xenon lamps used by manufacturers like Philips. Semiconductor UV LEDs emerged from labs at Nichia Corporation and research from University of Tokyo and Kyoto University. Synchrotron facilities such as SLAC National Accelerator Laboratory, Diamond Light Source, and ESRF generate tunable UV for materials research. High-energy processes in particle accelerators at CERN and fusion devices at ITER can produce UV emissions.
Atmospheric absorption and scattering of UV are central to climatology groups at NASA Goddard Space Flight Center and modeling teams at Met Office and European Centre for Medium-Range Weather Forecasts. The ozone layer, monitored by networks coordinated with World Meteorological Organization and satellite programmes like Aura, strongly attenuates UV-B and UV-C; historic policy responses linked to Montreal Protocol addressed ozone depletion. Photochemical reactions studied by chemists at Max Planck Society and universities including Harvard University and University of Cambridge drive production of radicals and secondary pollutants, relevant to air quality agencies including Environmental Protection Agency. Surface photochemistry on planets and moons is studied by teams at Jet Propulsion Laboratory and planetary science groups at Smithsonian Institution.
Biomedical research institutions—Mayo Clinic, Johns Hopkins University, Karolinska Institute—and health authorities like Centers for Disease Control and Prevention investigate UV-induced DNA damage, vitamin D synthesis, and immunomodulation. Landmark discoveries tie UV exposure to skin carcinogenesis studied by oncology groups at MD Anderson Cancer Center and epidemiology studies supported by National Institutes of Health. Dermatology centers at American Academy of Dermatology and clinical studies at Royal Marsden Hospital evaluate phototherapy and risks. Occupational standards from International Labour Organization and national regulators address workplace exposure. Public health campaigns by World Health Organization and national ministries of health promote sun-safe behaviours.
Technological applications span sterilization used in hospitals like Cleveland Clinic and water treatment projects in municipalities collaborating with firms such as Veolia and SUEZ. Semiconductor lithography developed in fabs run by Intel, TSMC, and Samsung employs deep-UV sources and extreme ultraviolet research links to ventures involving ASML. Forensics units in police forces collaborate with companies like Fujifilm for UV imaging; conservation teams at British Museum and Louvre use controlled UV for analysis. Agricultural research at USDA and universities like UC Davis explore UV effects on pathogens and crop physiology. Astronomy, with observatories including Very Large Telescope and missions like Hubble Space Telescope, uses UV bands to study star formation and interstellar medium.
Metrology institutions—National Institute of Standards and Technology, Physikalisch-Technische Bundesanstalt, International Organization for Standardization—develop radiometric units, calibration methods, and exposure limits. Instrumentation from companies like Ocean Optics and academic groups at Imperial College London produce spectroradiometers, photometers, and radiometers traceable to national standards. International standards (e.g., from ISO and IEC) and exposure action values set by World Health Organization and occupational agencies guide lab and industrial compliance. Satellite calibration campaigns involve agencies including NOAA and European Space Agency to ensure consistent long-term UV monitoring.
Category:Electromagnetic radiation