Kubvira panguva iyoyo, neptunium yakawanda yave ichigadzirwa neineutron irradiation yeuranium muzvigadziri zvenyukireya.
Chokwadika, shanduro yakaoma kunzwisisa zvikuru yemutsara wacho ndeiyi "Kubvira ipapo, neptunium yakawanda yave uye ichiri kugadzirwa ne neutron irradiation ye uranium mumagetsi enyukireya uye ruzhinji runogadzirwa sechibereko mumagetsi enyukireya emagetsi echinyakare".