Radiation leakage from linac electron applicator assembly

Richard A. Keys, James A. Purdy

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


The electron beam applicator system currently in use on the linear accelerator is constructed of light-weight fiberglass and aluminum. With an applicator in place on the accelerator, the photon collimator jaws are automatically set several centimeters greater than the electron field size projected at the patient's surface. To ensure that no regions of high dose levels exist outside the useful beam, ionization and film measurements were made to quantitate the amount of leakage radiation through the 10 cm X 10 cm and 25 cm X 25 cm applicators. In most regions, the ionization levels at the patient's surface were below 5% of the central axis dose. In one area for the 25 cm applicator, the percentage ionization was 8.5%, which could be reduced by the addition of a small piece of 1 8 inch thick lead. However, ionization levels on the outside surface of the applicator were found to be considerably higher at certain locations for the 25 cm applicator. Results for 6, 9, 12 and 20 MeV electrons are reported here.

Original languageEnglish
Pages (from-to)713-721
Number of pages9
JournalInternational journal of radiation oncology, biology, physics
Issue number5
StatePublished - Apr 1984


  • Electron beam applicator
  • Medical linear accelerator
  • Radiation leakage


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