Physical basis of dermatologic radiotherapy

  • Otto Braun-Falco
  • Stefan Lukacs
  • Herbert Goldschmidt

Abstract

X-rays are part of the electromagnetic spectrum, which also includes gamma rays, ultraviolet light, visible light, infrared light, and radio waves. Electromagnetic waves are a form of energy; other forms are kinetic, thermal, nuclear, and gravitational energy. They may be described as the periodic variation of intensities of electric and magnetic fields at a given point (Selman 1960; Johns and Cunningham 1969). Electromagnetic waves travel in a straight line from their source and are independent of the presence of matter. They are characterized by the following parameters:
  1. 1.

    The frequency (v) is the number of waves passing a given point each second, or the number of vibrations per second.

     
  2. 2.

    The wavelength (λ) is the distance between two successive points in the wave that are characterized by the same phase of oscillation.

     
  3. 3.

    The velocity (c) is the distance the wave moves per second; it is a function of the frequency of the radiation and of the nature of the medium traversed. (In a vacuum or in air, all electromagnetic waves move at a speed of 299,793 km/sec, or 186,171 miles/sec.)

     

Keywords

Filtration Lymphoma Attenuation Radium Tungsten 

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Copyright information

© Springer-Verlag New York Inc. 1976

Authors and Affiliations

  • Otto Braun-Falco
    • 1
  • Stefan Lukacs
    • 1
  • Herbert Goldschmidt
    • 2
  1. 1.Universität MünchenMünchenGermany
  2. 2.Bala-CynwydUSA

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