1980年-1981年在美國 Lawerance Berkeley 美國國家實驗室進修,劉元方師從諾貝爾獎獲得者 G. T. Seaborg 教授。1980年,劉元方到美國國立LBL(Lawrence Berkeley Laborator)的諾貝爾獎金獲得者西博格(G.T.Seaborg)教授的超重核組工作。這個研究組當時主要從事重錒元素的重離子核反應研究。劉元方相當獨立地進行97號元素錇(Bk)的化學工作,解決了從幾十種元素中快速分離純Bk的難題,重製了251Bk的衰變綱圖。同時還建立了從核燃料廢液中提取Rh、Pd、Tc的優於當時國外的先進流程。
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