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Beam defining system in an electron accelerator

  • US 4,140,129 A
  • Filed: 04/13/1977
  • Issued: 02/20/1979
  • Est. Priority Date: 04/13/1977
  • Status: Expired due to Term
First Claim
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1. A beam defining system for an electron accelerator which produces an electron beam cone, comprising:

  • (a) an adjustable collimator for producing the beam cone;

    (b) an accessory holder attached adjacent the collimator;

    (c) an electron applicator releasably attached to the accessory holder, said applicator including a tube wall positioned so as to enclose the electron beam cone from the collimator and a frame-shaped spacer movably attached to the tube wall and movable independently of the tube wall into contact with a patient to be treated, said tube wall having a first frame-shaped limiting aperture means associated with the tube wall for limiting edges of the electron beam cone facing away from the beam defining system; and

    (d) said frame-shaped spacer having a frame defining a second limiting aperture means having a periphery larger than a periphery of the first frame-shaped limiting aperture means, the second aperture means limiting the same edges of the electron beam cone as the first aperture means when the second aperture means is substantially at a predetermined distance from the collimator and in contact with the patient.

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