A person on a mailing list referred to a dose of radioactive iodine as a "nuclear drug."
I don't believe that all things radioactive are automatically nuclear.
Another person used the term "naturopath." Another term I am unfamiliar with. Do you suppose that they're like psychopaths? Pathological about nature? Probably not. From the context, it sounds like they advise you on a natural diet. Ah, I looked it up and it is a system of treatment of disease.