cerium-142

cerium-142

[′sir·ē·əm ‚wən‚fȯrd·ē′tü]
(nuclear physics)
A radioactive isotope of cerium with atomic mass number of 142; emits α-particles and has a half-life of 5 × 1015 years.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.