Cesium-137 in mothers' milk. The cesium content of mothers’ milk was determined on samples from three Bikini women in 1979, nine months after leaving Bikini where they had been resident for 3-8 years (Miltenberger et al, 1981). The mean body burden of cesium-137 was .13 pci (.09 - .18); the specific activity of the milk averaged .40 pCi/ml (.26 - .53); the mean specific activity of milk was therefore 3.3 x 10-¢ times the body burden. In 1977 on Rongelap the mean body burden of cesium-137 in women was -251 pCi. Applying the Bikini factor, gives .83 pCi/ml for the specific activity of cesium-137 in Rongelap milk. Taking milk consumption to be 2 liters per day, the committed dose generated in months 0 - 12 would be ey ptarenoeny (2,000 x .83) x (1.1 x 1.7 x 1078) = .030 ren. Transuranics. We have no data for the consumption by children of plutonium-239,240 and americium-241 and therefore estimate their dosage as follows: (a) For ingestion, suppose that infants and children eat as much of the transuranics as do adults. Taking the worst case of no supply ships for the entire year, so that only locally produced foods are consumed, Livermore now estimates an adult intake of 1.8 pCi/d (Ref. Robison ). For intake during the period 0-12 months of age the estimated committed effective dose equivalent would be: wore nee (1.8) x ((2.1 + 22)/2] x (1.3 x 10-3) = .028 rem (ist y, ingestion) Of this committed dose, not more than .019 rem would in fact be received during the first year. (b) To this would be added the dose from inhalation (Section 4.2). Taking .024 pCi/d as the adult exposure, which would be a liberal allowance for the infant, the committed whole-body dose would be: (.024) x (2.4 x .15) = .009 rem (O-1 year, inhalation) On this somewhat special bagis, the committed effective transuranic doses would be 0.037 rem (lst year). The dose absorbed during the first year presumably would be no more than .025 ren. 37