Compensated count-rate circuit for radiation survey meter

Details Compensated count-rate circuit for radiation survey meter Compensated count-rate circuit for radiation survey meter

1980-05-12

1981-09-29

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250388, G01T 118

Patent

active

042925398

ABSTRACT:
A count-rate compensating circuit is provided which may be used in a portable Geiger-Mueller (G-M) survey meter to ideally compensate for counting loss errors in the G-M tube detector. In a G-M survey meter, wherein the pulse rate from the G-M tube is converted into a pulse rate current applied to a current meter calibrated to indicate dose rate, the compensated circuit generates and controls a reference voltage in response to the rate of pulses from the detector. This reference voltage is gated to the current-generating circuit at a rate identical to the rate of pulses coming from the detector so that the current flowing through the meter is varied in accordance with both the frequency and amplitude of the reference voltage pulses applied thereto so that the count rate is compensated ideally to indicate a true count rate within 1% up to a 50% duty cycle for the detector. A positive feedback circuit is used to control the reference voltage so that the meter output tracks true count rate indicative of the radiation dose rate.

REFERENCES:
patent: 3366791 (1968-01-01), Markow
patent: 3576440 (1971-04-01), Jehle et al.
patent: 3576995 (1971-05-01), Nirschl et al.

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