To get a basic understanding of nuclear reactions, a high school level knowledge of a few basic concepts will suffice. In this regard, I'll start with a short recap of some concepts that will be used.

Structure of the atom

A basic atomic model will suffice for our discussion. In general, we can consider the atom to be composed of protons and neutrons tightly bound within the nucleus of the atom surrounded by electrons. The nucleus comprises almost the entirety of the mass of the atom, while the orbiting electrons make up the size of the atom.

Nuclear reactions

Arthur Clarke's Childhood's End was my main pick for 1953 in our survey of post-apocalyptic sci-fi, but John Wyndham's Kraken Wakes is another great apocalypse novel from the same year. (It was published as Out of the Deeps in the US. Apparently Americans weren't expected to know what Kraken means, until the second Pirates of the Caribbean movie, because now China Mieville can publish a novel just called Kraken and people purchase it.)