H - Electricity – 05 – G
Patent
H - Electricity
05
G
358/22
H05G 1/44 (2006.01) G01T 7/12 (2006.01)
Patent
CA 1042565
Abstract of the Disclosure Disclosed is an irradiation unit for ionizing radiation having at least one radiation detector exposed to the radiation, a radiation monitor for presetting the radiation dose to be applied and for restricting it to the preset nominal value, a preadjustable integrating unit connected to the radiation detector, and an automatic disconnect adapted to be triggered by the integrating unit when the preset radiation dose is reached. An additional control monitor is provided for monitoring both plus and minus tolerances of the radiation monitor, the control monitor being equipped with a dose-output frequency converter for converting the signals of a radiation detector into a frequency proportional to the dose output. First and second different frequency reducers are connected to the output of the dose-output frequency converter, the step-down ratios of which differ by the acceptable fault band-width, and with pulse counters connected to each of the frequency reducers, followed by a digital comparator with jointly preadjustable counting capacity. The output of the digital comparator associated with the first reducer which effects the greater reduction is connected to the automatic disconnect, whereas the output from the digital comparator associated with the second reducer which effects the lesser reduction is connected to a main cut-out switch which switches off the entire irradiation unit. The input of the dose-output frequency converter is connected to a radiation detector. The arrangement avoids the danger of excessive radiation doses being applied to a patient.
244299
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