核衰變產(chǎn)生的微粒或電磁波放射物的原子或分子由于核衰變放出的一束微?;螂姶挪?div>A stream of particles or electromagnetic waves emitted by the atoms and molecules of a radioactive substance as a result of nuclear decay.
An electromagnetic wave of audio frequency produced by atmospheric disturbances such as lightning, having a characteristically decreasing frequency responsible for a whistling sound of descending pitch in detection equipment.