.
.
.
.
.
90
Figure 4 and figure 6 illustrate the observed adult histories of
Sr and
137

.
.
.
Cs mean urine activity concentrations.

adults were plotted.
figure 7.

Mean values for adult males or all

Measured values for 13764 body burdens were also shown in

A much smoother curve was plotted in figure 7 and it was determined

that the collection and analysis technique for urine samples introduced the additional variations.

Based on this observation for

137

Cs, a smooth body burden

curve for 906,, reconstructed from raw data and equation 1, was considered a
more accurate history.

A detailed presentation of the greater variation in

urine bioassay measurements versus direct body burden measurements can be found
in Mi8l.
Figure 9 illustrates the variation exhibited in the body burden of 5

randomly chosen subjects over the 25 year monitoring period.
variations may have had a dramatic impact on the mean data.

These individual
In figure 2, which

illustrates the adult male, adult female and adult population mean 13704 body
burden for the 25 year exposure period, a decrease followed by an increase was

seen during the years 1958 through 1963.

Although the Castle BRAVO test ini-

tially contaminated Rongelap, it had been proprosed that the Hardtack Phase I se-

ries added to this an amount of contamination equal to that responsible for the
figure 2 body burden pattern (Co63).

Figure 9 suggests that most individuals

counted in those years had maintained or declined in body burden; however, one

individual's burden (#881 M) rose and fell quite differently from theothers.
Several factors could have contributed to this variation from the mean such as
departure and return to the atoll, sickness, the dietary contribution of
imported foods,

etc..

Since the mean vaiues 2cre based on small numbers of per-

sons who were chosen at random, it is conceivable that individuals like 881 M

10

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