System for measuring radiation doses in radiotherapy apparatus

Details System for measuring radiation doses in radiotherapy apparatus System for measuring radiation doses in radiotherapy apparatus

1976-04-12

1977-07-05

Dixon, Harold A.

Radiant energy

Invisible radiant energy responsive electric signalling

With means to inspect passive solid objects

250336, 250385, G01J 142

Patent

active

040342220

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.

REFERENCES:
patent: 2401289 (1946-05-01), Morgan et al.
patent: 3479603 (1969-11-01), Overstreet
patent: 3906233 (1975-09-01), Vogel
patent: 3914623 (1975-10-01), Clancy
patent: 3959653 (1976-05-01), Lee

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