fresh milk from the aret. lhis is dy rucioactivity taking tlsece in too depen te collect, process and distribute or wnich shipe milk out is presumably pooled with ner milk, me it takes wilk, Jasringten (Other dairies active in ancerson Dairy, “he Jecay in - aunty are the ic Las Vegas, vhere it «ind tne Highland Dairy, which has come in more recently, distributing uilk from northern Utah.) The chain, therefore, from nuclear explosion through Fallout, pasture, cow and milk to chilcren has been completed in many of these areas and for a consiierable number of children. What biological effect would be expected from these exposures? 5) \ The biolozical sisni ficance cf these levels It is now well known that radionetive lodine presents a special hazard to infants for the following reasons: 1. Milk is the largest human dietary source of iodine 131 and children generally drink more milk than adults. 2. For the same quantity of LOIine jan ~ hyroic of . eaten, the cells of the receive 10 to 15 tines the foce2ore cells of an adult thyroi?t. The i is much smaller, generally wei: hi + tne food infant « thyrctia q orams, whereas the adult on ~ an wo given quech. In the infant 20 @rans. Ap anne Boao. .é radiation i: spread over 3 mucr ch gram receives a greater ancaunt of and ea radiation. HM The infant! s thyroid usy be more onnsitive than the adulttcs Lo cancer induction ty' 61.’ .ation. De Thyroid cancer was observei in chiliicn li single exposure to radiation of 150 after a