A pedagogical derivation of critical radius for a fissile sphere equates average neutron path length to the distance needed for neutron balance, agreeing with known masses at the few-percent level.
π ? 3 d 1 rpv ´ 1qn2σtrσf s ˆ f. The factor f is a correction derived from a “more accu- rate integral theory
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An elementary method to determine the critical mass of a sphere of fissile material based on a separation of neutron transport and nuclear reaction processes
A pedagogical derivation of critical radius for a fissile sphere equates average neutron path length to the distance needed for neutron balance, agreeing with known masses at the few-percent level.