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<sup>252</sup>Cf-Source-Driven Neutron Noise Analysis Measurements for Coupled Uranium Metal Cylinders

Author
Mihalczo, J. T.
Published
United States : [publisher not identified], 1985
Springfield, Va.: National Technical Information Service, [approximately 1985]
Physical Description
microfiche : negative ; 11 x 15 cm
Additional Creators
Blakeman, E. D. and King, W. T.

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Summary
The 252Cf-source-driven neutron noise analysis method for obtaining the subcriticality of an assembly of fissile material from cross-power spectral densities (CPSDs) was developed to avoid some difficulties inherent in other measurement methods. This method requires measurement of frequency-dependent CPSD between a pair of detectors in or near the fissile assembly and CPSDs between these detectors and a source of correlated neutron noise from an ionization chamber containing 252Cf, also in or near the fissile assembly. Also, the auto-power spectral density of the source is required. The ratio of spectral densities is then formed and is related to the subcriticality. To date various measurements have been performed which demonstrate the usefulness of the method including measurements with single uranium metal cylinders. The experiments described here, which used coupled uranium (93.15 wt % 235U) metal cylinders separated by air, are the first application of this method to coupled systems.
Report Numbers
DE85016412; CONF-850610-39
Other Subject(s)
Collection
NTIS collection.
Note
DOE contract number: AC05-84OR21400
OSTI Identifier 5354510
Research organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States).
Funding Information
Sponsored by USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP).
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