actinium

noun

1. 锕（放射性化学元素）
   a chemical element. Actinium is a radioactive metal.

1. The removal of radioactivity from lanthanum oxide ii. a study on the extraction separation of lanthanum and actinium by some conventional organophosphorous extractants
   氧化镧中放射性的去除&Ⅱ.几种常用有机磷萃取剂对镧和锕的萃取分离研究
2. A short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead.
   一种存在周期短的放射性金属元素，由铀形成，能分裂成锕然后分裂成铅。
3. Other radioactive elements have been discovered since: actinium, radiothorium and mesothorium, ionium, etc.
   自那以后发现的其他放射性元素有：锄、放射性钍和新针、镍，等等。
4. A radioactive element of the alkali-metal group discovered as a disintegration product of actinium.
   【化】镧系（即稀土元素）一种碱金属属的放射性元素，是锕瓦解的产物。
5. Research Progress of New Extractant of Amide for Actinium Elements
   萃取锕系元素的新型酰胺类萃取剂研究进展
6. SOLUTION OF NON-INTEGRAL PRINCIPAL QUANTUM NUMBERS OF THE WAVE EQUATION AND ATOMIC STRUCTURE& Cause of the Presence of Transition Metals, Rare Earths and Actinium Series
   波动方程的非整数量子数解与原子结构&过渡金属、稀土金属和锕系元素存在的原因
7. Bench Scale experiments for the separation of lanthanum and actinium in nitric acid medium are carried out with multistage annular centrifugal extractors in series '.
   本文叙述了用离心萃取器进行HEHEHP-硝酸体系的镧、锕萃取分离台架试验。
8. Measurement of actinium series radionuclides in deep-sea sediment core using γ spectrometry
   深海沉积物岩心锕放射系核素的γ谱测定
9. With q deformed three parameter formula, the ground rotational bands of 29 even even rare earth and actinium nuclei have been calculated, and the fitting parameters have been analyzed.
   利用q变形三参数公式，计算了锕系和稀土偶偶核基带转动谱，详细分析了拟合参数值呈现出的规律性。

noun

1. a radioactive element of the actinide series

   Synonym:    Acatomic number 89