The values of rd are illustrated in Figs. 6 and 7 for the unfolding codes GRAVEL and MAXED, respectively.
Examination of the ratios reveals some deviations (5–11%) from unity for few spheres (3.5 in., 4 in. and 5 in.) comparatively to the remaining ones, due most probably to the variation of the reactor power from its nominal value registered during the BS measurements.