X-ray treatment machine having means for reducing secondary elec

Details X-ray treatment machine having means for reducing secondary elec X-ray treatment machine having means for reducing secondary elec

1975-03-14

1976-07-13

Smith, Alfred E.

Radiant energy

Radiant energy generation and sources

With radiation modifying member

250508, G01J 100

Patent

active

039696294

ABSTRACT:
In an x-ray treatment machine a charged particle accelerator or cobalt source is provided for producing a field of high energy x-ray radiation for application to a body, for treatment thereof. The radiation machine includes collimators and field shaping structures for shaping the field of x-ray radiation applied to the body. The high energy x-ray radiation intercepted by the field shaping and collimating structures produces high energy secondary electrons by a number of different atomic processes. These energetic secondaries contaminate the shaped radiation field applied to the body being treated. The contaminating high energy electrons, if not eliminated, substantially increase the dosage of radiation delivered to the surface of the body. However, electron deflecting means, such as magnet structures, are provided for interposing in the electron contaminated field of x-ray radiation, so as to provide an electron deflecting flux for deflecting the contaminating electrons and reducing the dose due to these electrons by spreading them out more uniformly over the treated surface. In addition, an electron absorbing screen is interposed in the secondary electron contaminated radiation field for further absorbing the unwanted high energy secondary electrons.

REFERENCES:
patent: 3482136 (1969-12-01), Herrera
patent: 3614424 (1971-10-01), Openshaw

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