The cross sections for neutron-induced fission of Pu 241 for neutrons of energies from 0.02 to 1.80 Mev and of Am 243 for neutrons of energies from 0.3 to 1.7 Mev have been determined. The determination was made by measuring the ratio of each cross section to that of U 235 using a back-to-back gas scintillation counter.
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