I have been asked to reply.
The possibility of adding these items to the national monitoring programme is being considered.
The fall-out of plutonium is of far less significance for health than strontium 90. Carbon 14 is not present in fall-out, but stays in the atmosphere along with that naturally formed by cosmic ray bombardment.
Will the right hon. Gentleman see that these deposits are inspected as quickly as possible, since it is considered that in view of the fact that they are so much longer-lived than strontium they may eventually prove far more dangerous?