| 单词 | actinium series |
| 释义 | > as lemmasactinium series actinium series n. the series of isotopes produced by the radioactive decay of uranium-235 (and including actinium-227, originally thought to be the parent), each member resulting from the decay of the previous one. ΚΠ 1906 New Internat. Encycl. XVI. 642b/2 The actinium series begins with actinium, which is precipitated by ammonia. It changes into actinium X, soluble in ammonia, without giving off rays. 1918 Science 3 May 442/1 A long-lived element of atomic weight ‘about 240’ which is the parent of the actinium series of elements. 1958 R. D. Connor in O. R. Frisch Nucl. Handbk. iv. §4 It gradually became clear that there existed three naturally-occurring families of radioactive substances, called the Uranium-Radium Series, the Thorium Series and the Actinium Series. 2009 H. Cember & T. E. Johnson Introd. Health Physics (ed. 4) iv. 116 Primordial radionuclides found in nature are not restricted to the thorium, uranium, and actinium series. < as lemmas |
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