## The Measurement of Thermal Neutron Spectra in Heterogeneous Lattices by Foil Activation |

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### Contents

Chapter | 1 |

Table Page I Summary of Previous Measurements | 10 |

THEORETICAL SPECTRUM CALCULATION TECHNIQUE | 14 |

41 other sections not shown

### Common terms and phrases

absorption cross section accurately Activation cross section activation ratios calculated aluminum atoms atoms/barn average flux cadmium calculated activation ratios Calculated and experimental count rates cp(E cutoff energy Decay constant detector foils detector packets different radial positions dysprosium error Eu:Dy europium expansion experimental spectra flux depression effects fuel region graphite graphite-moderated lattice In:Dy indium indium foil infinite irradiation isomeric yield ratios isotope low energies Lu:Dy ratios lucite lumps lutetium moderator region Natural Uranium Nelkin kernel NEUTRON ENERGY normalized activation ratios obtained particle perturbation effects predicted Reactor reference spectrum resonance integral resonance parameters rods self-shielding shielding effects shielding factors shielding function shown in Fig slab slugs spec spectra at different Square geometry standard deviation systematic Table Tassan temperature thermal column thermal neutron THERMOS calculations THERMOS spectra tion transport kernel trum tubes unfolded spectra Volpe volume ratio lattice W:U volume ratio water regions water-moderated lattices weighting function