983 K 24 pp. | ||

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Title | Critical Dimensions of Water-tamped Slabs and Spheres of Active Material | |

Author(s) | Greuling, E.; Argo, H.: Chew, G.; Frankel, M. E.; Konopinski, E.J.; Marvin, C.; Teller, E. | |

Publication Date | August 06, 1946 | |

Report Number | LA-609 | |

Unique Identifier | ACC0075 | |

Other Numbers | LADC-2241; OSTI ID: 4370986 | |

Research Org | Los Alamos Scientific Laboratory, NM (US) [Los Alamos National Laboratory (LANL)] | |

Contract No | W-7405-eng-36 | |

Sponsoring Org | US Atomic Energy Commission (AEC) | |

Other Information | Declassified December 16, 1955 | |

Subject | 72 Physics of Elementary Particles and Fields; 36 Materials Science | |

Keywords | Physics; Configuration; Critical Assemblies; Criticality; Differential Equations; Distribution; Fission; Fuels; Group Theory; Neutron Flux; Plates; Reflectors; Spheres; Transport Theory; Uranium Fluorides; Water Moderator; Fissionable Materials; Uranium(VI) Fluorides | |

Related Web Pages | Edward Teller | |

Abstract | The magnitude and distribution of the fission rate per unit area produced by three energy groups of moderated neutrons reflected from a water tamper into one side of an infinite slab of active material is calculated approximately in section II. This rate is directly proportional to the current density of fast neutrons from the active material incident on the water tamper. The critical slab thickness is obtained in section III by solving an inhomogeneous transport integral equation for the fast-neutron current density into the tamper. Extensive use is made of the formulae derived in "The Mathematical Development of the End-Point Method" by Frankel and Goldberg. In section IV slight alterations in the theory outlined in sections II and III were made so that one could approximately compute the critical radius of a water-tamper sphere of active material. The derived formulae were applied to calculate the critical dimensions of water-tamped slabs and spheres of solid UF{sub 6} leaving various (25) isotope enrichment fractions. Decl. Dec. 16, 1955. | |

983 K 24 pp. | ||

View Document | ||