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
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interest,
A.
= organ compartment deposition fraction for the element,
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