单词 | 核子反应 |
释义 | 〔einsteinium〕A synthetic transuranic element first produced by neutron irradiation of uranium in a thermonuclear explosion and now usually produced in the laboratory by irradiating plutonium and other elements. Its longest-lived isotope is Es 254 with a half-life of 276 days. Atomic number 99; melting point 860°C. See table at element 锿:一种人工合成超铀元素,在一次热核子反应的铀中子辐射中首次产生。 现在通常通过在实验室里辐照钚和其它元素而产生,其最不易衰变的同位素是Es254, 它的半衰期为276天,原子序数99;熔点860°C 参见 element |
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