Abstract
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 essentia] 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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Watson, T.A., Fedoruk, S.O. (1971). Teletherapy with artificial radioactive substances. In: Vieten, H., Wachsmann, F. (eds) Allgemeine Strahlentherapeutische Methodik / Methods and Procedures of Radiation Therapy. Handbuch der Medizinischen Radiologie / Encyclopedia of Medical Radiology, vol 16 / 2. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-80605-6_9
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DOI: https://doi.org/10.1007/978-3-642-80605-6_9
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