INTERNAL D'iSk EQUIVALENTS Disi itegrations occurring in the total body of an individual during residence following repatriation were determined by several methods. Equation 3, to- gether within personal body burden histories and atoll-specific dietary rate constants from table 3, provided an initial estimate of disintegrations between consecutive 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 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 +10% before a subject was assigned his or her total body disintegrations during residence post return. In general, the methods compared to within 5%, After the total number of disintegrations occurring in a subjects body were assigned, they were apportioned among the body organs according to the following equation = z ts fo§ 5 A:By; GC;D, + 1n2/d) Zep, (7A.B. + 1n2/d) iiiiii where F = the fraction of total body disintegrations occurring in the organ of interest, A. = organ compartment deposition fraction for the element, B. = organ compartment biological half time for the element, 19 (5)