The measures outlined in #1500 sound sound pretty thorough.
But we can’t rule out a political/religious/plain insane group or regime in 10, 100, 1000+ years hence deciding they are right to use “dirty” bombs – conventional explosive jacketed with the waste.
There are many recent examples of despots arising with ideology the RoW considered to be crackpot,
There have been civil wars in the UK, USA and many other countries.
That’s the thing about RAs – the one you never thought of comes back to bite you.