核燃料的加工 :制造原子弹 ,首先要拥有核燃料 ,主要是铀2 35和钚 2 390。天然铀矿石是一种稀有矿物 ,其中的铀 2 35仅占0 .7% ,其余都是不能发生链式反应的铀 2 380。从天然铀矿中提取铀 2 35 ,先要把铀 2 38分离出去 ,以不断提高铀 2 35浓度 ,这一加工过程称为“浓缩”。铀浓 The processing of nuclear fuel: Atomic bomb production, first of all to have nuclear fuel, mainly uranium 2 35 and cesium 2 390. Natural uranium ore is a rare mineral, of which uranium 2 35 accounts for only 0.7%, and the rest is uranium 2 380 which cannot undergo chain reaction. To extract uranium from natural uranium ore, the first step is to separate uranium 2 38 to continuously increase the concentration of uranium 235. This process is called “enrichment”. Uranium rich