核衰变产生的微粒或电磁波放射物的原子或分子由于核衰变放出的一束微粒或电磁波 A stream of particles or electromagnetic waves emitted by the atoms and molecules of a radioactive substance as a result of nuclear decay.
继承元素某种元素放射性衰变的直接产物 The immediate product of the radioactive decay of an element.
射气几种氡的同位素的放射性气体，是放射性物质衰变的产物 Any of several radioactive gases that are isotopes of radon and are products of radioactive decay.
衰变的具有相对较短的寿命而衰变，常用于亚原子粒子 Decaying with relatively short lifetime. Used of subatomic particles.
