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. Internal Dose Equivalents Disintegrations occurring’ in the ‘total bodyof an individual during residence following repatriation were determined by several methods. Equation (3), together with personal body-burden histories and-scoll specific Ky rate constants from Table 3, provided-an initial estimate of disintegrations between cuonsecutive body burden measurements. The second method used was a log-log plot of the subject's body burden history and an algebraic determination of area between , to consecutive measured points. The third method used.a linear plot of the . cunivet's body burden history. tT The area under the curve was cut and weighed and commared to a standard weight of known area, Quality control procedures required that all three methods agree within t102 before a subject was assigned his or her total body disintegrations during residence poat return. In general, the methods compared to within £5%, After the total number of disintegrations occurring in a subject's body was assigned, they were apportioned among the body organs according to the fuol~ F . fo TAB; (2,0, D, + In2/d) (4) ECD (EAB, + In2/d) where F = the fraction of total body disintegrations occurring in the organ of . e interest, A. = organ compartment deposition fraction for the element, 36 ‘ ' toe . " « ‘ veh ” ae so. . + . . ‘ Wye VP tyes - smnyt ~ we . wg re ‘ oO ree ay Tae Str tatnace ft srt aie ons eg ES wa 2a es, a VeSir CS laneoy ‘lowing equation