Table 9. Theintegral 30-, 50-, and 70-y dose equivalents for bone marrow and bone surfaces for intake of 20Sr beginningat various ages. Age intake begins Birth Bone marrow 30 y 50 y 70y 41.4 62.0 Integral dose equivalent, mrem Bone surface 30 y 50 y 70 y 30 y Effective 30 y 70 y 75.0 122 182 223 8.6 12.9 15.7 15.8 4 months 41.7 62.5 75.6 123 184 224 8.7 13.0 9 months 43.1 63.7 76.6 127 187 227 9.0 13.3 16.0 1.5 y 43.8 64.3 77.1 129 189 229 9.1 13.4 . 16.1 4y 43.2 64.0 77.0 126 187 228 9.0 13.3 16.1 12 y 49.3 70.4 83.5 137 199 241 10.0 14.4 17.3 18 y 48.5 69.8 82.9 116 175 217 9.3 13.6 16.5 Table 10. The integral 30-, 50-, and 70-y effective dose equivalent for continuous intake of 137Cs and 90Sr beginningat various ages. Integral effective dose equivalent, mrem@ Fraction due to Sr Age intake begins 30 y 50 y 70 y 30 y 50 y 70y Birth 4 months 386 398 580 592 702 714 0.02 0.02 0.02 0.02 0.02 0.02 © 9 months 367 560 683 0.03 0.02 0.02 iSy 370 564 687 0.03 0.02 0.02 4y 391 585 708 0.02 0.02 0.02 12 y 469 663 786 0.02 0.02 0.02 18 y 513 705 829 0.02 0.02 0.02 * * The effective dose equivalent is a unit defined by the ICRP (1984) which allows for the different mortality risks associated with irradiation of different organs, together with a proportion of the hereditary effects. ye -eur fo & a Discussion The result of our analysis is that the reason is the consistently higher intake of local — integral 30-, 50-, and 70-y effective dose foods, and thus !37Cs , for adults found in the equivalent estimated for intake beginning as diet surveys from the Marshall Islands. that for intake beginning at any other age. Consequently, the estimated integral dose equivalent for adults is a conservative estimate for infants and children. There are two basic reasons for this result. The first, and major, supported by diet surveys of other societies; the intake for adults is greater than for infants and children. The second reasonis that even for continuous 137Cs intake that declines at a rate equal to the adults at a contaminated atoll is greater than 3 LZS5 3008254 Also, the higher intake of food in general by adultsis 1