i1 . Weight (kg) on o > o Weight (kg) a °o ~l o 80 20 7 10 3 1 Figure 1. 1 to 18 y. $3 5 7 9 #11 13° 615 ‘ 3 0 #17 4 6 Po 9 12 Age (months) Age (y) Body weight as a function of age, Figure 2. Body weight as a function of age, 0 to 12 mo. development and Ca/Sr metabolism as a function of age, the reader is directed to papers by the authors of the various age-dependent 90Sr dose models and their associated references (ICRP, 1972; Cristy et al., 1984; Leggett etal., 1982, 1984; Papworth and Vennart, 1973, 1984; Spiers, 1968; Bennett, 1973, 1977, 1978). Dosimetry Cesium-137 and that no energy is transferred to any other organ,i.e., target (T) organ. In other words, for The conversion from the intake of 137Cs to charged particles, the source organ is also the the dose-equivalent rate and integral dose equivalent is based upon the ICRP methods described in ICRP Publication 30 (ICRP, 1979). For charged-particle emission, the basic ICRP target organ. As result, the specific effective energy, SEE, (Te 5S), in meV/g per transformation, changes proportionally with mass for the standard adult; the relationship as a function of age is 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. (SEE), = 20 (SEE).aur, M It is assumed for charged-particle emissions that all where (SEE),4.,is the ICRP value for standard man, 70 kg is the mass of standard man, and Mtis the body or organ massat age t. This is the basis of the energy is deposited in the organ that contains the activity, i.e., the source (S) organ, 5008253 15