| 单词 | radium emanation |
| 释义 | > as lemmasradium emanation radium emanation n. now historical the radon isotope with atomic weight 222, which is the first product of the alpha decay of radium-226; cf. emanation n. 2c. ΘΚΠ the world > matter > physics > atomic nucleus > radioactive isotope > specific isotopes > [noun] > radium > radon radium emanation1901 thoron1918 1901 Nature 13 June 157/2 The radium emanation..preserved its radiating power for several weeks. 1946 F. E. Zeuner Dating Past x. 318 As radium decays, a gas called radium-emanation is formed which, in turn, emits another atom of helium and thereupon changes into a solid substance, called radium A. 1984 N. N. Greenwood & A. Earnshaw Chem. of Elements (1986) xviii. 1043 Element 86..is a short-lived, radioactive element, formerly known as radium-emanation or niton. < as lemmas |
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