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[UV-radiation--sources, wavelength, environment].

Erhard Hölzle1, Herbert Hönigsmann

  • 1Klinik für Dermatologie und Allergologie, Klinikum Oldenburg, Germany. hoelzle.erhard@klinikum-oldenburg.de

Journal Der Deutschen Dermatologischen Gesellschaft = Journal of the German Society of Dermatology : JDDG
|August 25, 2005
PubMed
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Ultraviolet (UV) radiation from the sun, categorized into UVA, UVB, and UVC, is biologically effective radiation. Factors like atmosphere, geography, and activity influence cumulative UV exposure.

Area of Science:

  • Environmental Science
  • Dermatology
  • Physics

Background:

  • Solar radiation encompasses ultraviolet (UV) radiation, a portion of optical radiation ranging from 290-4,000 nm.
  • UV radiation is internationally classified into UVC (200-280 nm), UVB (280-320 nm), and UVA (320-400 nm) based on wavelength.
  • Global radiation, or solar radiation reaching Earth's surface, is modified by atmospheric conditions, geographic factors, and time-dependent variables.

Purpose of the Study:

  • To define ultraviolet (UV) radiation and its environmental sources.
  • To explain the factors influencing solar radiation reaching the Earth's surface.
  • To describe the determinants of cumulative UV exposure.

Main Methods:

  • Review of international definitions for UV radiation classification.

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  • Analysis of factors affecting solar radiation penetration and modification in the atmosphere.
  • Identification of variables contributing to cumulative UV dose.

    • Main Results:

    • UV radiation is categorized into UVC, UVB, and UVA, with specific wavelength ranges.
    • Atmospheric conditions (ozone, pollution), geographic latitude, elevation, season, time of day, cloudiness, and indirect radiation modify global radiation.
    • Cumulative UV exposure is significantly influenced by outdoor activities, occupation, sunbed use, and phototherapy.

    Conclusions:

    • Understanding the characteristics and environmental modulation of UV radiation is crucial.
    • Biologically effective radiation is a complex interplay of solar output and Earth's atmospheric/geographic factors.
    • Cumulative UV exposure is multifactorial, involving environmental and behavioral components.