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In natural uranium, 0.720% of atoms are U-235, 0.0055% are U234, and the remainder is U238. The density of natural uranium is u=18.95g/cm3 a. What

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In natural uranium, 0.720% of atoms are U-235, 0.0055% are U234, and the remainder is U238. The density of natural uranium is u=18.95g/cm3 a. What is the total macroscopic cross section for a thermal neutron in natural uranium? b. What is the macroscopic fission cross section for thermal neutrons in natural uranium

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