Radiation Stability - What is it?

Question

A quick definition if you please .. this is in terms of nuclear reactors, and what properties their coolant must have. Radiation Stability is listed as an ideal property but I dont know what it is?

Answer 1

Stability and Instability in Nuclei

Why are some nuclei stable while others decay radioactively?

The answer lies in conservation of energy. A nucleus will decay if there is a set of particles with lower total mass that can be reached by any of the above types of decay process or simply by fission, a process in which a massive nucleus splits into two less massive ones.  Alpha decay is also a type of fission, common because the alpha particle is a particularly low energy arrangement of two protons and two neutrons.