| 单词 | thorium series |
| 释义 | > as lemmasthorium series thorium series n. the series of isotopes produced by the radioactive decay of thorium 232 (the major natural isotope), each member resulting from the decay of the previous one. ΘΚΠ the world > matter > chemistry > elements and compounds > metals > specific elements > thorium > [noun] > series of isotopes produced by the radioactive decay of thorium series1913 1913 Chem. News 28 Feb. 97/2 The parent of ionium, the product in the uranium series corresponding with radio-thorium in the thorium series, is still experimentally unknown. 1955 I. Kaplan Nucl. Physics x. 207 In the actinium and thorium series, the mass numbers are given by the expressions 4n + 3 and 4n, respectively. 1973 J. Yarwood Atomic & Nucl. Physics viii. 246 There are three main series of radioactive elements: the uranium, thorium, and actinium series, leaving out, for the present, the comparatively recently discovered neptunium series. < as lemmas |
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