| 释义 |
americium|æməˈrɪsɪəm, æməˈrɪʃ(ɪ)əm|
[f. Americ(a + -ium.]
A metallic radioactive transuranic element produced artificially by the bombardment of uranium with high-energy helium nuclei. Symbol Am, atomic number 95.
Discovered by G. T. Seaborg, R. A. James and L. O. Morgan at Berkeley, California, in 1945.
1946N.Y. Times 11 Apr. 15/4 Elements 95 and 96, the two newest trans-uranium elements to be created, have been named, respectively, Americium, after the Americas, and curium. 1946Times 20 Nov. 3/3 The isolation in a pure form of americium, one of four newly discovered elements in the release of atomic energy, was announced last night before the American Chemical Society. 1952Sci. News XXIV. 92 The two following elements, americium..and curium..show similarity and difficulty of separation comparable to the rare-earths case. |