§ Mr. Pavittasked the Parliamentary Secretary for Science what were the levels of fall-out for radiocarbon and radioiodine, respectively, immediately following the Russian tests; and what are the levels at the present time.
§ Mr. Denzil FreethThe quantity of carbon from nuclear tests cannot be directly monitored because it is indistinguishable from that which occurs naturally. As stated in the reply to the hon. Member's Question on 8th May, it is estimated that it is small compared with that occurring naturally.
Levels of iodine 131 in milk during the weeks following the Russian tests were given in the Agricultural Research Council Radiobiological Laboratory's Report on Radioactivity in Diet (A.R.C. R.L.6) published on the 7th February, 92W 1962. No iodine 131 has been detected in any samples of milk collected between 29th May and 2nd June.