rate constant (K,=0) was used for Zn, the dose equivalent rate for the average adult was in excess of Federal Radiation Council Guidelines for the first 2 years following the return to Utirik. a a He. Internal Dose Equivalents Disintegrations occurring in the total body of an individual during residence following repatriation were determined by several methods. Equation (3), together with personal body~burden histories and atoll-specific dietary rate constants from Table 3, provided an initial estimate of disintegrations between congécutive body-burden measurements. The ®Rcond method used was a log-log plot of the subject's body-burden history and an algebraic determination of area between two consecutive measured points. subject's body-burden history. The third method used a linear plot of the The area under the curve was cut and weighed and compared to a standard weight of known area. Quality control procedures required that all three methods agree within t10% before a subject was assigned his or her total body disintegrations during residence post-return. In general, the methods compared to within t5%. After the total number of disintegrations occurring in a subject's body were assigned, they were apportioned among the body organs according to the following equation . - £)0,A,B. (MED. + 1n2/r) . ' . £.C.D.(Z.A.B. + In2/A) iii’ iii ’ (3) where F = the fraction of total body disintegrations occurring in the organ of interest, A. = organ compartment deposition fraction for the element, 36