The problem of obtaining U237

Two methods of obtaining U237 are considered: irradiation of U235 and U236 in different neutron beams from a nuclear reactor (1013-1016 neutrons/cm2·sec), and the accumulation of U237 in plutonium enriched with the isotope Pu241. Optimal methods of irradiating uranium and plutonium in order to obtain maximum accumulation of U237 and Pu241 respectively are suggested. In the calculations data is used on the cross sections for thermal neutrons taken from the literature.