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继铀元素transuranium element 现在已知者有五种,即九十三号、九十四号、九十五号、九十六号、九十七号等元素。其中以九十四号鐪最为重要。这些都是近五六年来发明的元素。在六年以前,不要说对于继铀元素的化学性质和放射性是毫无所知,即对于铀前的八十九、九十、九十一等号元素亦是知道得很少。铀本身还是当作少见的元素。在一九四○年五月麦密兰Mcmillan 和亚倍耳生Abelson 在加利福尼大学,用了劳伦斯的回旋通cyclotron 中放出的中子,发见了第一个继铀元素。他们从实验证明铀经过了中子的作用,变为短命的錼,继续放射高速电子,半寿限2.3日。先由中子纳入U2.39变成二十三分钟的U239,再经过放射电子的衰退而成錼。
Following the uranium element transuranium element Now known to have five, namely, ninety-three, ninety-four, ninety-fifth, ninety-sixth, ninety-seven and other elements. Among them, No. 94 is the most important one. These are the elements invented in the last five or six years. Six years ago, it is not to be understood that nothing is known about the chemical nature and radioactivity of uranium, that is, very little is known about pre-uranium elements 89, 90 and 91. Uranium itself is still considered a rare element. In May 1940 Mcmillan and Abelson Abelson at the University of California used the first neutron to see the neutron emitted by Lawrence’s cyclotron. From experiments, they proved that uranium went through the role of neutrons and became short-lived and continued to emit high-speed electrons with a half-life of 2.3 days. U239 first into the U2.39 neutrons into twenty-three minutes of U239, and then through the decline of radioactive electrons into a 錼.