强调核观念(与传统的核物理课不同)，特别是核子辐射和其与物质的交互作用。

Emphasis is on nuclear concepts (as opposed to traditional nuclear physics), especially nuclear radiations and their interactions with matter.

youdao

原本的用法是指核爆后引发的核子辐射落尘。如果是空中爆炸的核弹所产生的放射性核污染会进入大气层高处，运行到远方然后造成辐射落尘，伤害人畜。

The worst fallout of the explosion was the doubt it created about the reliability of the designed Titan IV booster, of which both the Air Force and CIA are heavily dependent.

youdao

这种加热十分有效可以将物体质能的大致50%转化为辐射，如相对的核子熔化只能转化质能很少的百分比。

This heating is extremely efficient and can convert about 50% of the mass energy of an object into radiation, as opposed to nuclear fusion which can only convert a few percent of the mass to energy.

youdao