位于美国爱达荷州的爱达荷国家实验室于1952年开始了一项计划,以研究固态锫及其化合物的化学及物理属性。Burris B. Cunningham和Stanley Gerald Thompson(英语:Stanley G. Thompson)于1958年用8克的钚-239作为目标体,在反应堆内对其进行持续6年的放射,最后首次制成了宏观数量的锫元素(0.6微克)。[39][45]这是目前唯一一种可用来制造可称量的锫的方法,且大部分实验所用到的固态锫重量都不超过几微克。[17][46]
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