The heat production in rocks due to radioactivity is highest in the acid rocks and lowest in the ultra-basic rocks . 岩石的放射作用热产率以酸性岩类最高，超基性岩类最低。
When the bubble expands, however, and some of the water evaporates again, some of the radioactivity may return to the bubble . 可是当汽泡膨胀和一部分水又重新汽化时，某些放射性又回到汽泡中去。
Radioactivity provides an extremely sensitive method of analysis since disintegration of individual nuclei are monitored . 因此放射现象可以监视每一个核的裂变，因此放射现象提供了一个极灵敏的分析方法。
This is due almost entirely to the radioactivity of the fission products present in the weapon residues(or debris)after the explosion . 它们几乎全部由爆炸后出现在武器残骸（或碎块）中的裂变产物的放射性所引起的。
By tracing the fate of the radioactivity within a living organism, one can learn the normal pathway of this carbon compound in that organism . 通过追踪放射性在活体内的去向，人们能得知这种碳化合物在体内正常的途径。
The environmental engineer has an interest in nuclear chemistry as the radioactivity emanating from changes in unstable elements can result in hazards to health . 环境工程师对核化学感兴趣的是不稳定元素变化时放射出的放射性对人体健康的危害。
Dimensions of test tubes for radioactivity measurements 用于放射性测量的试管尺寸
Cloud chambers are used for studying radioactivity 云室是用于研究放射活动的。
Rules of radioactivity inspection for import minerals 进出矿产品放射性检验规程
Standard practices for the measurement of radioactivity 放射性测量的标准实施规范
