Influence of a priori information on the accuracy restore of the thermonuclear neutron spectra

Results of numerical investigation of unfolded neutron spectrum influence on the accuracy of a priori information for typical thermonuclear reactor spectra are presented. Unfolding was carried out using SAND-II program. The carried out calculations showed that for specially plotted smooth ''thermonuclear'' spectra in some energy range (4-13 MeV) correction of a priori spectrum by reference to detector activation integrals doesn't take place. This is due to small contribution of this neutron energy region to the total flux (and, consequently, to activation integral) and due to absence of detectors sensitive to 4-13 MeV neutrons only. In the neutron energy range where detectors show maximum activity, correction of a priori spectrum takes place and unfolded and initial spectra are brought together