Whakakiia te rerenga e whai ake nei: I te Hui-tanguru 1945, i angitu te roopu iti o nga kaiputaiao ki te whakaputa i te iti o te rauemi i roto i te wehewehe taketake i roto i te RIKEN complex<unk>te rauemi i tohuhia e te RIKEN's cyclotron "kaore" i te uranium-235.I mutu te kaupapa wehewehe i te Maehe 1945, i te wa i whakangaromia ai te whare e noho ana i te ahi i tukuna e te RIKEN.
Ko te "Operation Meetinghouse" a te USAAF i Tokyo. Kaore i ngana ki te hanga i tetahi puranga uranium; kaore i te waatea te wai taumaha, engari ko Takeuchi Masa, ko ia te kawenga mo te wehewehe a Nishina, i tatau ko te wai marama ka nui mena ka taea te whakarei i te uranium ki te 5<unk>10% uranium-235.