Model of a fission counter system for optimizing performance at high gamma dose rates. [LMFBR]
A mathematical model has been developed for predicting the ability of a fission counter to operate at a high gamma dose rate. There are several potential applications in reactor programs for detectors that can accurately measure neutron fluxes in the range 0.1 to 1.0 nv(th) while subjected to gamma dose rates of 10/sup 4/ to more than 10/sup 6/ R/hr. Fission counters for such service have up to now been designed on the basis of laborious testing of prototypes combined with extrapolation from existing designs. The objective of this work is to make it possible to arrive at an optimum design without expensive testing. In this model, the complete system of counter, cables, preamplifier, main amplifier, filters, and discriminator is considered, including the effects of interaction of counter capacitance with cable and preamplifier impedance. Electrical noise theory is used to calculate the frequency spectrum of the interfering signal generated by pileup of gamma pulses, to add to it a contribution from electronic noise, and to obtain the rate at which the total noise signal triggers the discriminator. The shapes and widths of neutron and gamma pulses are calculated from the electron drift velocity and electrode spacing.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 6482713
- Report Number(s):
- ORNL/TM-6408
- Country of Publication:
- United States
- Language:
- English
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Design of optimized RC-CR filters for current-pulse operation of fission counters and high sensitivity fission counters for high gamma backgrounds
Conference
·
Wed Dec 31 23:00:00 EST 1975
·
OSTI ID:7347238
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
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Tue Dec 31 23:00:00 EST 1974
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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
BREEDER REACTORS
DETECTION
EPITHERMAL REACTORS
FAST REACTORS
FBR TYPE REACTORS
FISSION CHAMBERS
IONIZATION CHAMBERS
LIQUID METAL COOLED REACTORS
LMFBR TYPE REACTORS
MEASURING INSTRUMENTS
NEUTRON DETECTION
NEUTRON DETECTORS
PERFORMANCE
RADIATION DETECTION
RADIATION DETECTORS
REACTOR INSTRUMENTATION
REACTORS
SPECIFICATIONS
210500 -- Power Reactors
Breeding
440101* -- Radiation Instrumentation-- General Detectors or Monitors & Radiometric Instruments
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BREEDER REACTORS
DETECTION
EPITHERMAL REACTORS
FAST REACTORS
FBR TYPE REACTORS
FISSION CHAMBERS
IONIZATION CHAMBERS
LIQUID METAL COOLED REACTORS
LMFBR TYPE REACTORS
MEASURING INSTRUMENTS
NEUTRON DETECTION
NEUTRON DETECTORS
PERFORMANCE
RADIATION DETECTION
RADIATION DETECTORS
REACTOR INSTRUMENTATION
REACTORS
SPECIFICATIONS