Electron accelerator and target with collimator

Details Electron accelerator and target with collimator Electron accelerator and target with collimator

1980-04-23

1982-04-27

Smith, Alfred E.

Radiant energy

Radiation controlling means

250510, H05H 712, H01J 3500, G21K 100

Patent

active

043272932

ABSTRACT:
The invention relates to a radio therapy apparatus comprising an electron accelerator having a target and a collimator for limiting the X-ray cone. In the use of such electron accelerators, the radiation load of the patient is increased in an undesirable manner by neutrons in addition to the therapeutically desired roentgen quanta. To reduce the neutron level the invention provides that the edge zone of the collimator facing the target is made of a material of low effective cross-section for (gamma, n) processes. The dimension of this edge zone material approximately corresponds to the half-value depth of the X radiation in this material.

REFERENCES:
patent: 4121109 (1978-10-01), Taumann et al.
patent: 4157475 (1979-06-01), Stock et al.

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