Assuming that the cross section for fast-neutron fission of 235U was the same as for slow neutron fission, they determined that a pure 235U bomb could have a critical mass of only 6 kg instead of tons, and that the resulting explosion would be tremendous.
Idet de antog at tværsnittet for hurtig-neutron fissiion i 235U var den samme som for fission med langsomme neutroner, bestemte de at en ren 235U bombe kunne have en kritisk masse på kun 6 kg i stedet for i tons, og at den følgende eksplosion ville være gigantisk.