Extended range radiation dose-rate monitor

Patent · Tue Aug 30 04:00:00 EDT 1988

OSTI ID:6711190

Valentine, K H

An extended range counter system is described for measuring ionizing radiation dose-rates up to at least 1000 R/h, comprising: an ionizing radiation detector means for producing current pulses at a rate corresponding to the photon interaction rate of ionizing radiation to be detected and having an amplitude proportional to the charge deposited by each photon of radiation detected; an amplifier means responsive to each of the current pulses for generating fixed width voltage pulses at an output thereof having an amplitude proportional to the amplitude of the current pulses; a comparator means having a signal input connected to the output of the amplifier means and a reference voltage input for generating a logic pulses at an output thereof for each input pulse from the amplifier means which exceeds the comparator means threshold determined by a reference voltage level applied to the reference voltage input of the comparator means; an integrator means connected to the output of the comparator means for integrating the logic pulses to provide an output signal proportional to the rate of logic pulses applied to the input thereof; a signal feedback means for feeding back a selected portion of the output signal from the integrator means to the reference voltage input of the comparator means to vary the comparator means threshold so that as the radiation dose-rate detected by the detector means increases the comparator means threshold increases to extend the sensitive dynamic range of the system up to at least 1000 R/h; and a meter connected to the output of the integrator means and calibrated to indicate measured radiation dose-rate in response to the output signal of the integrator means.

• Assignee: Dept. of Energy, Washington, DC
• Patent Number(s): US 4767929
• OSTI ID: 6711190
• Country of Publication: United States
• Language: English

Related Subjects

440102* -- Radiation Instrumentation-- Radiation Dosemeters
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
AMPLIFIERS
COMPARATOR CIRCUITS
COUNTING TECHNIQUES
DESIGN
DOSEMETERS
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
EQUIPMENT
FEEDBACK
FUNCTION GENERATORS
INTEGRATED CIRCUITS
IONIZING RADIATIONS
MEASURING INSTRUMENTS
MICROELECTRONIC CIRCUITS
MONITORING
MONITORS
PULSE AMPLIFIERS
PULSE CIRCUITS
PULSE GENERATORS
RADIATION MONITORING
RADIATION MONITORS
RADIATIONS
RANGE
SIGNAL CONDITIONERS