Electron accelerator and target with collimator
US4327293A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 23, 1980 |
| Grant date | Apr 27, 1982 |
| Priority date | — |
| Expiry date | Apr 23, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG21K1/02
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.