Table 4. Estimates of the daily intake of 99Sr from local foods by age at Rongelap Atoll. Age 0 to 3 months 4 to 8 months 9 monthsto 1.4 y T5yto3y 4ytolly I2ytol7y 218 y Infant (4 to 8 months). For infants between 4 and 8 months, we assumethat diluted coconut milk is given occasionally to supplement or %Sr intake, pCi/d — replace breast milk. On the average, breast milk accounts for 95% of the 1.3 L/d intake anda 0.056 0.57 3.4 9.2 mixture Of equal parts water and coconut milk make up the other 5%. The daily intake of 137Cs is thus: «8.2 11 14 326 pCi/L (0.95) 1.3 L/d (0.05) . + 1300 mL/d 5 4.7 pCi/mL = 403 pCi/d + 153 pCi/d Cesium-137 = 556 pCi/d, Newborn/Fetus. The concentration of !37Cs in the fetus in the early months of pregnancy appears to be less than that of the mother (linumaet al., 1969) and about equal to that of the mother in the latter months of pregnancy where the !37Cs concentration in coconut milk.is 4.7 pCi/mLandin breast milk is 325 pCi/L. Infant/Child (9 months to 1.4 y). Breast milk or formula is still the main food source for infants/children in this age group, but small amounts of local foods are given to the infants to supplement the milk. We assume the 137Cs and at birth (linuma et al., 1969; Wilson and Spiers, 1967). Thus, the average concentration of” 137Cs during the entire gestation period would appear to be somewhat less than that of the mother. Infant (0 to 3 months}. The entire diet for this age range is essentially breast milk or intake to be no more than 20% of the adylt intake. Consequently, the 137Cs intake from breast and coconut milk is 556 pCi/d, as for formula. Measurements of 137Cs in breast milk and in the diet of a 24-y-old woman show that about 30% of the ingested 137Csis secreted per L of milk (Aarkrog, 1963). Consequently, with the infants 4 to 8 months (see above), plus 217 pCi/d (0.20 x 1085 pCi/d) from local foods, for a total daily intake of 773 pCi. Child (1.5 y to 3 y). The average daily infant diet being breast milk, the intake of 137Cg intake of 137Cs for children aged 1.5 y to 3 y by an infant would not exceed the adult intake. In fact, measurements of !37Cs in the infants and from our diet model when imported foods are available is 517 pCi/d (Appendix A, Table A-2). Child (4 y to 11 y). The average daily their mothers show that the concentration of 137Cs in infants on breast milk never exceeded the 137Cs concentration in their mothers (Rundo, intake of 137Cs from our diet model for children 1970); the infant's 137Cs concentration, on the average, was 75% of the mother. aged 4 y to 11 y, when imported foods are available, is 594 pCi/d (Appendix A, Table A-3). Teenage (12 y to 17 y). The average daily intake of 137Cs for teenagers from our diet model when imported foods are available is 761 pCi/d (Appendix A, Table A-4). Using the value of 30% for the 137Cs_ ingested that is secreted per L of milk and the average adult intake of 1085 pCi/d, the 137Cs concentration in breast milk would be 326 pCi/L. If the average milk intake by the infant is 1.3 L/d, the average daily intake of 137Cs for an infantis 424 pCi/d. 50001b5 11