radioactive isotope n.
An isotope having an unstable nucleus that decomposes spontaneously by emission of a nuclear electron or helium nucleus and radiation, thus achieving a stable nuclear composition.
noun, Physics, Chemistry. 1. a succession of elements initiated in the radioactive decay of a parent, as thorium or uranium, each of which decays into the next until a stable element, usually lead, is produced. noun 1. (physics) a series of nuclides each of which undergoes radioactive decay into the next member of the series, […]
noun 1. the radioactive by-products from the operation of a nuclear reactor or from the reprocessing of depleted nuclear fuel. noun 1. any waste material containing radionuclides Also called nuclear waste Radioactive materials that may be left after a commercial or laboratory process has been carried out. Some is “low-level” waste, such as objects that […]
- Radio alarm
noun clock radio Examples Easily switch between your favorite stations on the radio alarm with preset tuning buttons. Word Origin 1949
noun 1. the branch of astronomy that utilizes extraterrestrial radiation in radio wavelengths rather than visible light for the study of the universe. noun 1. a branch of astronomy in which a radio telescope is used to detect and analyse radio signals received on earth from radio sources in space radio astronomy The study of […]