Compensated count-rate circuit for radiation survey meter
- Powell, TN
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.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4292539
- OSTI ID:
- 864021
- Country of Publication:
- United States
- Language:
- English
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Compensated count-rate circuit for radiation survey meter
Compensated count rate circuit for portable Geiger-Mueller survey meter
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circuit
radiation
survey
meter
compensating
provided
portable
geiger-mueller
g-m
ideally
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counting
loss
errors
tube
detector
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rate
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applied
calibrated
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generates
controls
reference
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coming
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varied
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amplitude
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50
duty
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positive
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feedback circuit
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voltage pulse
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current flow
radiation dose
duty cycle
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reference voltage
dose rate
count rate
pulse rate
radiation survey
pulses applied
survey meter
g-m tube
current applied
positive feedback
meter calibrated
generating circuit
rate current
compensating circuit
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