System for measuring radiation doses in radiotherapy apparatus
US4034222A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1976 |
| Grant date | Jul 5, 1977 |
| Priority date | — |
| Expiry date | Apr 12, 1996 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N5/1048
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A system for measuring radiation doses in radiotherapy comprises two identical metering networks energized in parallel from a common radiation source, each network including an integrating amplifier whose time constant is variable by the short-circuiting of an input resistor. A manually or automatically reversible switch selectively foreshortens the time constant of one or the other amplifier whereby the corresponding metering network controls the cutoff of the radiation source whenever the emitted radiant energy reaches a predetermined value. The other network, acting as a backup, takes over the radiation cutoff upon failure of the controlling network; this takeover may be indicated by a set of signal lamps jointly controlled by the reversing switch and by a counting unit of the standby network.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.