The Application of Pulsed Neutron Sources to Criticality Measurements

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Abstract: Experimentally measured promp-neutron decay constants for sub-critical systems are of considerable value as normalization data for calculations of prompt-neutron time constants. A method of measuring these decay constants with a pulsed neutron source, neutron detector and multi-channel time-delay analyzer has been developed and used on a number of fast-spectrum subcritical systems. An analysis of this method based on the one-energy group, one-delayed-neutron group reactor kinetic equations is presented and discussed. The curve of neutron flux versus time predicted by the kinetic equations is compared with the observed curve obtained with a 13.1-cm. diam. enriched-uranium sphere to indicate the application … continued below

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12 p. : ill. ; 28 cm.

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Passell, Lawrence; Bengston, Joel & Blair, Donald C. January 30, 1957.

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Abstract: Experimentally measured promp-neutron decay constants for sub-critical systems are of considerable value as normalization data for calculations of prompt-neutron time constants. A method of measuring these decay constants with a pulsed neutron source, neutron detector and multi-channel time-delay analyzer has been developed and used on a number of fast-spectrum subcritical systems. An analysis of this method based on the one-energy group, one-delayed-neutron group reactor kinetic equations is presented and discussed. The curve of neutron flux versus time predicted by the kinetic equations is compared with the observed curve obtained with a 13.1-cm. diam. enriched-uranium sphere to indicate the application and limitations of the analysis.

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12 p. : ill. ; 28 cm.

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Digitized from microopaque cards (1).

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  • OCLC: 930726183
  • SuDoc Number: Y 3.AT 7:22/UCRL-4808
  • Report No.: UCRL-4808
  • Archival Resource Key: ark:/67531/metadc714785

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  • January 30, 1957

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  • Feb. 12, 2018, 7:42 a.m.

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  • April 23, 2019, 3:45 p.m.

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Passell, Lawrence; Bengston, Joel & Blair, Donald C. The Application of Pulsed Neutron Sources to Criticality Measurements, report, January 30, 1957; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc714785/: accessed July 16, 2025), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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