radioactive disintegration

the most probable explanation of radioactive disintegration is to be found in terms of the modern ideas concerning the structure of matter.

必须根据物质结构的现代观点才能更好地阐明放射性裂变现象。

practically every atom had its origin in the tiny violence of a radioactive disintegration some time within the past few billion years.

实际上每个原子都来源于过去几十亿年中某一时刻放射性分裂的微小激变。

Type of radioactive disintegration ( see radioactivity) in which some unstable atomic nuclei dissipate excess energy by spontaneously ejecting an alpha particle.

放射性蜕变的一类，某些不稳定原子核自发射出一个α粒子以耗散过剩能量。

Any of three processes of radioactive disintegration in which a Beta particle is spontaneously emitted by an unstable atomic nucleus in order to dissipate excess energy.

某些不稳定原子核为耗散其过剩能量而自发发射一个β粒子的三种放射性衰变过程的统称。

A radioactive element of the alkali-metal group discovered as a disintegration product of actinium.

【化】镧系（即稀土元素）一种碱金属属的放射性元素，是锕瓦解的产物。