If using the natural uranium to replace the heu pit in warhead , the delayed neutron counting rate would be about 3 times lower . the coincidence neutron detection is proposed to be used in nuclear warhead detection 計(jì)算表明用天然鈾替代高濃鈾作的假?gòu)楊^,它們的出殼緩發(fā)中子數(shù)相差約3倍,需在一定條件下,才可對(duì)真?zhèn)魏藦楊^做出判斷。