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Title: Compensated count-rate circuit for radiation survey meter

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.

Inventors:
 [1]
  1. (Powell, TN)
Issue Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
OSTI Identifier:
864021
Patent Number(s):
4292539
Assignee:
United States of America as represented by United States (Washington, DC) ORNL
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
compensated; count-rate; circuit; radiation; survey; meter; compensating; provided; portable; geiger-mueller; g-m; ideally; compensate; counting; loss; errors; tube; detector; pulse; rate; converted; current; applied; calibrated; indicate; dose; generates; controls; reference; voltage; response; pulses; gated; current-generating; identical; coming; flowing; varied; accordance; frequency; amplitude; thereto; count; true; 50; duty; cycle; positive; feedback; control; output; tracks; indicative; feedback circuit; circuit generates; applied thereto; voltage pulse; voltage pulses; current flow; radiation dose; duty cycle; current flowing; 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; /250/

Citation Formats

Todd, Richard A. Compensated count-rate circuit for radiation survey meter. United States: N. p., 1981. Web.
Todd, Richard A. Compensated count-rate circuit for radiation survey meter. United States.
Todd, Richard A. Thu . "Compensated count-rate circuit for radiation survey meter". United States. https://www.osti.gov/servlets/purl/864021.
@article{osti_864021,
title = {Compensated count-rate circuit for radiation survey meter},
author = {Todd, Richard A.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1981},
month = {1}
}

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