[rree
an
Figure 11 shows the individual data calculated for 137g for all Ronge lap
residents and is referenced to June 1, 1957.
The individual maximum 137cq daily
activity ingestion rate was approximately 4 times the population mean value.
The standard deviation observed for the adult activity ingestion rate distribution was 41% of the mean value, 39% of the mean value for young adults, 48% for
adolescents, 38% for children, and 54% for infants.
Adolescents and infants
exnibited a broader distribution than adults, while children showed a fractional
vériation in activity ingestion rate similar to that of adults.
Breast feeding
versus coconut sap supplements would have contributed to the greater variation
observed in infants.
Adolescents and young adults were the population subgroups
which have been observed to move frequently between atolls.
This mobility would
2
leid to greater variations in the daily activity ingestion rates relative to
those observed in the more stationary population subgroups.
Figure 12 also exhibited a wave pattern; however, a distinct difference between males and females was indicated.
This difference arose from the use of
vaiues for Ke listed in Table 3 which were derived from urine data for male and
fezale residents at Rongelap Atoll.
Its major impact was on the dose equivalent
rate, not on the total dose equivalent; and its effect was to cause the dose
equivalent rate for males to rise and decline more rapidly than for females.
Figures 13a and 13b summarize the individual data for
Rongelap residents and were referenced to June 1, 1957.
90 Sr for all
A bimodal shape was
observed for the distributions which contained both sexes, again reflecting the
difference in the 90,, dietary rate constants.
Data from urine bioassay
indicated that the observed difference between the male and female values for Ke
was not significant.
A t-test was performed for consecutive urine measurement
data during the 23 year residence interval.
28
The results indicate that because