Compensated count-rate circuit for radiation survey meter

Patent · Tue Sep 29 04:00:00 EDT 1981

OSTI ID:5585235

Todd, R A

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.

• Assignee: Department of Energy
• Patent Number(s): US 4292539
• OSTI ID: 5585235
• Country of Publication: United States
• Language: English

Related Subjects

440102* -- Radiation Instrumentation-- Radiation Dosemeters
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
COUNTING CIRCUITS
DOSE RATES
DOSES
ELECTRONIC CIRCUITS
GEIGER-MUELLER COUNTERS
MEASURING INSTRUMENTS
PULSE TECHNIQUES
RADIATION DETECTORS
RADIATION DOSES