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Fic. §. Body-purden historv for Rongelap adults.
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Fic 4. Dailyactivity ingestion rate for day of return
to Rongelap Atoil.
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daily fluid intake (Na80). Children and adolescents. however. were observed to receive a large
portion of their daily fluid intake from two
imported meals per day as part of the school
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Fic. 6. Bods-burden histors for Utrrk adults
lunch program. Studies indicated that coconuts
and coconut tree sap provided the major source
of “Cs in the diet (Le80a: Mi80). Thus. the
undulating shape of Fig. 4 reflected this vanation in the dietaryintake of '?’Cs-contaminated
foods.
Adult average values for activity ingestion
rate on day of return were calculated for all
nuclides. Results are listed in Table 4. This
information, together with the estimate of& for
the nuclide of interest. was used mm equation (2)
to estimate adu't body-burden histories based
on the assumption of declining continuous intake (see Figs. 5 and 6).
The declining continuous intake equation (3)
provided a smooth body-burden function for
Rongelap and Utirik adults. The equation was
a tool to provide retroactive body-burden estimates during the early years post-return to
Utirik. Few direct measurements were made at
this time. The data plotted in Fig. 6 for “Co and
“Fe were derived from Rongelap measurements.
Biological variation and errors in the col-
lection and analysis of urine samples introduced
larger errors in body-burden estimates than did
direct whole-body counting. These variations
can be observed in Fig. 5 where “Sr data vary
widely from the theoretical curve. In contrast.
the '’Cs data fit the curve closely.
The method used to generate Figs. 5 and 6
was not chosen to minimize the weighted sum of
squares of deviations of the body-burden estimates and measurements from thefitting function (equation (2)). Instead average values of k
and P° were selected to represent all the bodyburden data. For Rongelap, the '’Cs body
burdens varied from the fitted function by a