美[?k?t?ni?m] 1 . Any of a series of chemically similar, radioactive elements with atomic numbers ranging from 89 ( actinium ) through 103 ( lawrencium ).
錒類任何化學性質相似, 原子序數在89 ( 錒 ) 與103 ( 鐒 ) 之間變化的放射性元素.
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2 . The extraction mechanism and separation process of lanthanum and actinium were studied in HDEHP ( kerosene ) NO 3 system.
本文研究了在HNO_3體系中,P_ ( 204 ) 萃取La和 Ac的 機理及影響La, Ac萃 取分離因素,給出了La, Ac分配的數學摸型.
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3 . The extraction mechanism and separation process of lanthanum and actinium were studied in HDEHP ( kerosene ) - HNO 3 system.
研究了在HNO_ 3體系中,P_ ( 204 ) 萃取La和 Ac的 機理及影響La, Ac萃取分離因素,給出了La, Ac分配的數學模型.
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1.錒：鈾礦中的稀有金屬化學元素，具放射性，原子序數89，原子量227，化學符號Ac
