Current pulse characteristics and gamma-noise frequency spectrum measurements for a neutron fission counter
Conference
·
OSTI ID:7347238
The pulse characteristics from neutron interactions in a fission counter (99.4 percent enriched /sup 235/U) were modeled for practical ranges of counter variables. The gamma-noise spectra of the counter were measured for these same ranges of counter variables so that the effects of the variables on both the neutron pulse characteristics and the gamma-noise spectra could be determined. The proper selection of counter variables will yield the highest practicable ratio of the neutron-induced signal amplitude to gamma-noise background. This optimization is required so that the counter can have a sensitivity of approximately 10 counts sec/sup -1/ (nv(th))/sup -1/ while exposed to a gamma dose rate of 10/sup 4/ to 10/sup 6/ R/hr. Such a counter is required for ex-vessel, low level, flux monitors in liquid-metal fast breeder reactors. New results obtained from this study include a determination of the effects of the fission counter electrode-to-ground capacitance, electron collection time, and the time constant of the electrode capacitance and preamplifier input resistance on the neutron-induced current pulse and the current pulse frequency spectrum. The effects of the electron collection time and electron capacitance-preamplifier resistance time constant on the magnitude of the gamma-noise spectra were also determined.
- Research Organization:
- Oak Ridge National Lab., Tenn. (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 7347238
- Report Number(s):
- CONF-761006-4
- Country of Publication:
- United States
- Language:
- English
Similar Records
Model of a fission counter system for optimizing performance at high gamma dose rates. [LMFBR]
Design of optimized RC-CR filters for current-pulse operation of fission counters and high sensitivity fission counters for high gamma backgrounds
Design of optimized RC-CR filters for current-pulse operation of fission counters and high sensitivity fission counters for high gamma backgrounds
Technical Report
·
Tue Oct 31 23:00:00 EST 1978
·
OSTI ID:6482713
Design of optimized RC-CR filters for current-pulse operation of fission counters and high sensitivity fission counters for high gamma backgrounds
Conference
·
Sat Jan 31 23:00:00 EST 1976
· IEEE Trans. Nucl. Sci., v. NS-23, no. 1, pp. 331-341
·
OSTI ID:4045746
Design of optimized RC-CR filters for current-pulse operation of fission counters and high sensitivity fission counters for high gamma backgrounds
Conference
·
Tue Dec 31 23:00:00 EST 1974
·
OSTI ID:4152290
Related Subjects
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
210500 -- Power Reactors
Breeding
440101* -- Radiation Instrumentation-- General Detectors or Monitors & Radiometric Instruments
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BACKGROUND RADIATION
BREEDER REACTORS
ELECTROMAGNETIC RADIATION
EPITHERMAL REACTORS
FAST REACTORS
FBR TYPE REACTORS
FISSION CHAMBERS
GAMMA RADIATION
IONIZATION CHAMBERS
IONIZING RADIATIONS
LIQUID METAL COOLED REACTORS
LMFBR TYPE REACTORS
MEASURING INSTRUMENTS
NEUTRON DETECTION
NEUTRON DETECTORS
NOISE
OPTIMIZATION
PULSES
RADIATION DETECTION
RADIATION DETECTORS
RADIATIONS
REACTORS
SENSITIVITY
TIMING PROPERTIES
210500 -- Power Reactors
Breeding
440101* -- Radiation Instrumentation-- General Detectors or Monitors & Radiometric Instruments
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BACKGROUND RADIATION
BREEDER REACTORS
ELECTROMAGNETIC RADIATION
EPITHERMAL REACTORS
FAST REACTORS
FBR TYPE REACTORS
FISSION CHAMBERS
GAMMA RADIATION
IONIZATION CHAMBERS
IONIZING RADIATIONS
LIQUID METAL COOLED REACTORS
LMFBR TYPE REACTORS
MEASURING INSTRUMENTS
NEUTRON DETECTION
NEUTRON DETECTORS
NOISE
OPTIMIZATION
PULSES
RADIATION DETECTION
RADIATION DETECTORS
RADIATIONS
REACTORS
SENSITIVITY
TIMING PROPERTIES