be the order of 10-15 days for i- to 2-year-old children and increases to ~ 100 days by age 20. adult life. It then remains reasonabiy constant throughcut The body mass is less for the younger aze groups, and these two factors tend to offset each other in dose calculaticns. Doses to Q children are generally less than for adults as a result of the combination fPsetting factors. When the relative dietary intake is Oo of these two . ta included, chiidren receive a lesser dose than acult Therefore, dose estimates for adults are usually a conservative estimate for children. than 6 yr, including: adults. or vu r . 9O : . . : c pei 9 Sr/z Ca in human tone is greater Tor ages 1-5 rH 17 indicate that the 1p o _ 16 ct 90 Sr — Rerorts by Loutit, 15 > > es greater However, the turnover rate is much more rapid and the retenticn time much shorter for Sr in azes 1-5. The combination of these two factors determines the bone burden, the annual dose, and the dtse commitment resulting from a speciried ingestion of 9 9 Sr. For children, these two factors tend to orfset each other; the - * a 3 _ resulting ccse to children, therefore, fs not straightforward and is 4 Gerencent upon the reistive interaction of these two Tractors. Any + UY comparisen with adults must thererore take into account the age dependence tp of these Factors as well as the difference in dietary intake. 1 reported by Bennett” is therefore used for estimating the doses to children. ia ao ,+ 0 : : : = _s . 7 Sr — Models developed ty ICRP for estimating ct ad Dose Models and Qs 4. oO : 90 + . ; 18-2 ingested ~ Sr are considered to be ase invariant. 16. _ - ; . bone dose from A recent model from . ; Goes modei the child separately from the adult, and this model is applied for estimating the bene oses to children. Q, Bennett The model.