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-body of :an individual during resiEquation (3), dence following repatriation were determined by several methods. together with personal body-burden histories and atoll specific Kp rate con- stants from Table 3, provided -an initial estimate of disintegrations between cunsecutive body burden measuremants. The second method used was a log-log plot of the subject's body burden history and an algebraic determination of area between t~O consecutive measured points. sunject's body burden history. The third method used.a linear plot of the The area under the curve was cut and weighed and commared to a standard weight of known area. Quality control procedures required that all chree methods agree within +10% 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 was assigned, they were apportioned among the body organs according to the fol-~ lowing equation . £) 0, A,5. (ZC. D, + Ind/d) rT iiivibii .0D.CEAB, * Ina/a) Om) where F = the fraction of total body disintegrations occurring in the organ of ® . na ia fe interest, A. = organ compartment deposition fraction for the element, 36 o r EE tes weer ONT oe CORE SRY Se et eteere ssseisenyee | pe. “per 8 pyaar , . ae t ' aa Sr ee ~ ae . (ete my