B; = organ compartment biological half cime for the element, C = total body compartment deposition fraction for the element, D; = total body compartment biological half time for the element, f = fraction of the element from blood to organ of reference. i Equation (5): applied where significant decay occurred jat the deposition site, and not during transit or re~transit to the organ of interest. | Valucs for compartment deposition fractions and compartment half times were obtained from | “ Ki78. Values for the regining quenfities were from ICRP59,' The dose equivalents to a specific organ or the totel body sere determined « | ters from Ki78. The total..target dose equivalent was “obtained by. summation of 8 the dosimetric contributigps from all source organs. e Several important modi fica-. tions to the general procedure were made in order to compute, individual dosimetric results. For gach person, the source to target dose’ equivalent per unit cumulated activity wae weighted by the ratio of a standerd man's body mass relative to the actual mean body masse during the interyal for which the dou equivalent was determined, In the case of 137Cs, the long term biological re- moval rate constant for the Marshallese population was highly dependent upon body mass (Mi81). Appropriate modifications to Eq. (2), (3), and ($) were tade to reflect this dependence. Finally, for 906. deposition in bone, 28% of tlie source fo target dose equivalent per unit cumulated activity was assumed from cancellous bone and 72% from certical bone. Figure 18 demonstrates the mean dose equivalent from and sex groupings. tion. 137 Cs for various age The residence interval was from 1957 to 1980 for this popula- The adolescents and persons above 50 years of age in 1957 maintaine! rhe lowest dose equivalent. Persons who died during this period were not included 37 “y,, see age me “ ar