Cleanup of Tactical Nuclear Weapons?

I know this is probably a stupid question as the result of even a minimal nuclear exchange would be hellish, but I'm curious about the cleanup process for tactical nuclear weapons. For example, if a Davy Crockett was fired in battle and for whatever reason did not explode, what would happen? It seems like the remaining material from a dud tactical warhead would be both incredibly valuable and dangerous. Someone somewhere at the Pentagon must have been tasked with explaining how the cleanup process would work, right? I'm curious as to what cleanup would mean.