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 residence following repatriation were determined by several methods.
Equation (3),
together with personal body burden histories and atoll specific K, rate con-
stants 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
te consecutive measured points.
supiect's body burden history.
The third method used a linear plot of the
The area under the curve was cut and weighed and
com~ared to a standard weight of known area.
Quality control procedures
required that all three methods agree within 410% before a subject was assigned
his or her total body disintegrations during residence post return.
In general,
the methods compared to within +52.
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
Fe
£,' £,4,8; (2:0,D, + In2/d)
£.C.D.(Z.A.B.
tui
221
+ 1n2/dA)
’
(5)
where
F
= the fraction of total body disintegrations occurring in the organ of interest,
A.
= organ compartment deposition fraction for the element,
36