Nuclear Science and Engineering / Volume 39 / Number 1 / January 1970 / Pages 50-55
Technical Paper / dx.doi.org/10.13182/NSE70-A21170
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The absolute ratio of fission densities due to thermal- and epicadmium-neutron fluxes has been measured by solid-state track detectors. A systematic deviation from this absolute ratio is observed when measuring gamma activities of fission products. From a careful analysis of the gamma spectra with a Ge(Li) detector, it was concluded that this systematic deviation is due to important changes in the mass distribution of fission products produced by epicadmium neutrons, with respect to the well-known mass distribution for thermal neutrons.