Have the Defence Forces any special training, and if so what is it, to enable them to deal with the eventuality of a nuclear attack either on this country or an adjoining country and the presence of radioactive material in the atmosphere? What is the position in that regard?

That is a totally different question. The State's response to nuclear threat is provided by the Civil Defence force. That response is based on a certain hypothetical scenario to deal with fallout arising from a nuclear explosion elsewhere. The response to deal with that hypothesis is adequate and in training exercises has shown itself to be entirely satisfactory.