| 单词 | radioactivity |
| 释义 | radioactivity (once / 14830 pages) n WORD FAMILY radioactivity: radioactivities+/radioactive: nonradioactive, radioactively, radioactivity USAGE EXAMPLESNavy, an expert on nuclear radioactivity and an adjunct professor at Georgetown University. Washington Post(Dec 23, 2016) Some towns near the plant remain no-go zones because of above-normal radioactivity. Wall Street Journal(Dec 09, 2016) Fermi and his talented colleagues found that slow neutrons are remarkably effective at inducing radioactivity in some heavy chemical elements. Nature(Oct 11, 2016) n the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay Syn|Hypo|Hyper radiation corpuscular radiation, particulate radiation a stream of atomic or subatomic particles that may be charged positively (e.g. alpha particles) or negatively (e.g. beta particles) or not at all (e.g. neutrons) alpha radiation, alpha raythe radiation of alpha particles during radioactive decay beta radiation, beta ray, electron radiationradiation of beta particles during radioactive decay neutron radiationradiation of neutrons (as by a neutron bomb) emission the release of electrons from parent atoms |
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