11 9 DB = Weight (kg) Me atte ere Re ti ee 60 fF =z 2 7 ® = 5 10 J. 1 Figure 1. #3 Joecemmmnfimmnrsmnaniimmnrsssaiines 5 ¢ dinate 9 4 11 13 mt 15 3 ail. 17 i. 0 Age(y) 3 he AL. wien wih 6 A a 9 ail 12 Age (months) Body weight as a function of age, Figure 2. Body weight as a function of age, ‘development and Ca/Sr metabolism as a (ICRP, 1972; Cristy et al., 1984; Leggett et al., function of age, the readeris directed to papers 1982, 1984; Papworth and Vennart, 1973, 1984; by the authors of the various age-dependent Spiers, 1968; Bennett, 1973, 1977, 1978). 1 to 18 y. 0 to 12 mo. 90Sr dose models and their associated references Dosimetry Cesium-137 and that no energy is transferred to any other organ, ie., target (T) organ. In other words, for The conversion from the intake of !37Cs to the dose-equivalent rate and integral dose charged particles, the source organ is also the target organ. Asa result, the specific effective energy, SEE, (Te S$), in meV/g_ per transformation, changes proportionally with mass for the standard adult; the relationship as a function of age is equivalent is based upon the ICRP methods described in ICRP Publication 30 (ICRP, 1979). For charged-particle emission, the basic ICRP methodology is adjusted for age dependence by using body weights (and organ weights) for various ages determined by methods described in the "Retention" section of this paper. It is assumed for charged-particle emissions that all of the energy is deposited in the organ that (SEE) = 20 (SEE)aautt , M: where (SEE),au, is the ICRP value for standard man, 70 kg is the mass of standard man, and M;is contains the activity, i.e., the source (S) organ, S0001b4 the body or organ massat age t. This is the basis 15