rs ll ret. wpe. eh eo Es A . me mee Table 4. Estimates of the daily intake of 9°Sr from local foods by age at Rongelap Atoll. Age 0 to 3 months 4 to 8 months 9 months tol4y 15yto3y 4ytolly 12 ytol7y 218y 90Sr intake, pCi/d 0.056 0.57 3.4 9.2 8.2 11 14 Infant (4 to 8 months). For infants between 4 and 8 months, we assumethat diluted coconut milk is given occasionally to supplement or replace breast milk. On the average, breast milk accounts for 95% of the 1.3 L/d intake and a mixture of equal parts water and coconut milk make up the other 5%. The daily intake of 137Cs is thus: 326 pCi/L (0.95) 13 L/d (0.05) 5 4.7 pCi/mL + 1300 mL/d = 403 pCi/d + 153 pCi/d Cesium-137 Newborr/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 = 556 pCi/d, where the !37Cs concentration in coconut milk is Spiers, 1967). Thus, the average concentration of 4.7 pCi/mLand in breast milk is 325 pCi/L. Infant/Child (9 months to 1.4 y). Breast milk or formulais still the main food source for appear to be somewhat less thanthat of the amounts of local foods are given to the infants to the mother in the latter months of pregnancy and at birth (linuma et al., 1969; Wilson and 137Cs during the entire gestation period would mother. Infant (0 to 3 months). The entire diet for this age range is essentially breast milk or formula. Measurements of 137Cs in breast milk and in the diet of a 24-y-old woman show that about 30% of the ingested 157Cs is secreted per L infants/children in this age group, but small supplement the milk. We assume the !37Cs intake to be no more than 20% of the adult intake. Consequently, the 137Cs intake from breast and coconut milk is 556 pCi/d, as for infants 4 to 8 months (see above), plus 217 pCi/d (0.20 x 1085 pCi/d) from local foods, for a total infant diet being breast milk, the intake of 137Cs daily intake of 773 pCi. Child (1.5 y to 3 y). their mothers show that the concentration of 137Cs_ in infants on breast milk never exceeded from our diet model when imported foods are available is 517 pCi/d (Appendix A, Table A-2). of milk (Aarkrog, 1963). Consequently, with the by an infant would not exceed the adult intake. In fact, measurements of 137Cs in the infants and the 137Cs concentration in their mothers (Rundo, 1970); the infant's 137Cs concentration, on the average, was 75% of the mother. 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 !37Cs concentration in breast milk would be 326 pCi/ L. If the average milk intake by the infant is 1.3 L/d, the average J a) daily intake of !3’Cs for an infant is 424 pCi/d. G25 S The average daily intake of 137Cs for children aged 1.5 y to 3 y Child (4 y to 11 y). The average daily -intake of 137Cs from our diet model for children 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 foodsare available is 761 pCi/d (Appendix A, Table A-4).