Pedzisa mutsara unotevera: Pakazosvika Kukadzi 1945, boka duku revasayendisiti rakanga rabudirira kubudisa huwandu hushoma hwezvinhu mune yakasarudzika yekuparadzanisa muRIKEN yakaoma <unk>zvinhu izvo cyclotron yeRIKEN yakaratidza kuti "kwete" uranium-235.
"Operation Meetinghouse" yeUSAAF yakarwisa Tokyo. Hapana kuedza kwakaitwa kuvaka murwi weuranium; mvura inorema yakanga isingawaniki, asi Takeuchi Masa, uyo akanga achitarisira mupatsanuri waNishina, akaverenga kuti mvura yakareruka yaizokwana kana uranium yaigona kupfumiswa kusvika ku5<unk>10% uranium-235.