radioiodine and remove loose material from the decks; (c) the principal sources of internal absorption would have been from ingestion, but since food and water were protected this source of absorption must have been negligible. A few words about internal absorption of piutonium., The Marshallese were exposed to a much greater hazard from this source than CROSSROAD personnel, I just received word that on the basis of sensitive urine tests recently developed at Brookhaven National Laboratory the Marshallese people had only absorbed plutonium in amounts that were 1/100 to 1/200 of the maximum permissible body burden and that based on 50 years of exposure the dose to the bone would have been very low. As an atomic veteran this is very reassuring to me. With regard to genetic effects we have not detected any increase in abnormalities in children of exposed Marshallese parents. greater Of importance are the results of studies of thousands of Japanese children whose parents received hundred of rads of radiation. Some of the best geneticists in the worid have studied these children and have found no increase in abnormalities that could be attributed to radiation exposure of the parents. Therefore it seems extremely unlikely that genetic abnormalities from radiation exposure would be detected in children of CROSSROADS personnel.