Abstract
Homogeneous neutron absorbing and scattering rods are introduced into a volume of moderator across which in the absence of the rods a thermal neutron flux distribution with a predominant tilt is maintained. The flux perturbation caused by the rods is measured and compared with monopoledipole response coefficient theory, which has been developed for idealized problems. It is found that although this theory predicts the shape of the asymptotic flux perturbation correctly it in general overestimates the size of the perturbation. This discrepancy is attributed to the differences between the idealized problem and experimental arrangement, and suggests that the theory should be used with caution in cell calculations where macroscopic flux variations are large.
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