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dub·ni·um AHD[do͞obʹnē-əm] D.J.[ˈduːbniːəm]K.K.[ˈdubniəm]n.Symbol Db （名词）符号 Db - An artificially produced radioactive element with atomic number 105 whose most long-lived isotopes have mass numbers of 258, 261, 262, and 263 with half-lives of 4.2, 1.8. 34, and 30 seconds, respectively. Also called unnilpentium ：人造放射性元素，原子序数号为105，生命期最长同位素的质量为258、261、262和263，半衰期分别为4.2秒、1.8秒、34秒和30秒 也作 unnilpentium
- After Dubna , Russia, the location of the United Institute of Nuclear Research After Dubna , Russia, the location of the United Institute of Nuclear Research
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