Abstract
Abstract The neutron importance function in a nuclear fission reactor can be determined by means of the usual radioactive neutron sources only down to a lower energy limit of about 20 keV. The energy range can be extended to epithermal energies if a polyethylene moderated Sb-Be-photoneutron source is used. The results of experimental and theoretical investigations are given concerning the determination of the source spectrum and the source strength and regarding the pecularities of the pseudo-reactivity measurements by means of the moderated Sb-Be- source. Determining the neutron importance function in the fast substituted lattice SEG-III of the Rossendorf annular core reactor RRR the usefulness of this novel source and of the source parameters ascertained are confirmed.
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