CEer adults. For equal intakes of radioactivity, children probably would receive higher exposures due to the emaller organ masses, snd in the case of bones @ | greater deposition would be expected. Also, there is the possibility of tumor production in the thyroids.of some children at relatively low radiation exposures. It would appear wise therefore to establish lower limits of intake of radioactivity for children. C. Permissible Intake The preceding discussion attempted to give estimates of radiation doses resulting from intake of fallout material, together with same possible biological effects. How much intake is actually permitted depends upon many factors including the essentialness of the food and water to sustaining life, and one's philosphy of acceptable biological risks and damage in the face of other possible hazards such as mass evacuation. Table Two and Graph Five give estimates of the amount of contamination in food and water to produce certain rediation doses to the critical organs. logical effects fram given doses. Table tur indicates possible bio- Using these references, command decisions may be made as to permitted intake of radioactivity. Such evaluations as attempted here are necessary and valuable for planning purposes ,butconece the fallout occurs the emergency of the situation may preclude immediate analysis of the food and water supplies. Further, abstaining from ingestion of food and water because it might be contaminated could rot be continued indefinitely. sense rules are suggested: Therefore, the following three common DOE ARCHIVES -15-