INTERNAL DiSt EQUIVALENTS
Disi itegrations occurring in the total body of an individual during residence following repatriation were determined by several methods.
Equation 3,
to-
gether with personal body burden histories and atoll-specific dietary 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
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 +52.
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
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,
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