镎
镎（Neptunium）是一种化学元素，符号为Np，原子序为93。镎是首个超铀元素，属于锕系金属。镎具有放射性，渠个最稳定个同位素237Np是核反应堆搭钚生产过程个副产品，能够用拉制造中子探测仪。
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