System for measuring irradiation doses intended for use in...

Details System for measuring irradiation doses intended for use in... System for measuring irradiation doses intended for use in...

G - Physics

01

T

358/5

G01T 1/16 (2006.01) G01T 1/29 (2006.01) A61N 5/10 (2006.01)

Patent

CA 1054261

ABSTRACT OF THE DISCLOSURE: 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 inte- grating amplifier whose time constant is variable by the short- circuiting of an input resistor. A manually or automatically re- versible 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.

250736

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