Teletherapy with artificial radioactive substances

  • T. A. Watson
  • S. O. Fedoruk
Part of the Handbuch der Medizinischen Radiologie / Encyclopedia of Medical Radiology book series (HDBRADIOL)


In recent years there has been increasing interest in the development of radioactive isotopes as teletherapy sources. This has been a logical development from the experience with radium beam units, which have been in operation for more than thirty years. The essential features of both types of units are the same. The radioactive material is encased in a thick shield, from which the gamma rays are allowed to escape only through one small adjustable opening. A means of occluding the beam, when not required, is provided either by a moveable diaphragm, or by the movement of the source away from the opening. This shielded isotope source can now be mounted on an apparatus which will allow for various movements. A collimating device is added as well as light delineation of field size, or cones, and usually beam directional apparatus. If now there is added to these basic simple ingredients a great deal of chrome streamlining, multi-colored paints and an impressive coined name, we have a commercial teletherapy apparatus.


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© Springer-Verlag Berlin Heidelberg 1971

Authors and Affiliations

  • T. A. Watson
  • S. O. Fedoruk

There are no affiliations available

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