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.
Glaser, On the Proliferation Potential of Uranium Fuel for Research Reactors at Various Enrichment Lev- els, Science and Global Security 14(1) 1-24 (2006)
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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.