Figure 11 shows the individual data calculated for 137¢5 for all Ronge lap residents and is referenced to June 1, 1957. The individual maximum 1376, 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 af 3 adolescents, 38% for children, and 54% for infants. Adolescents and infants exhibited a broader distribution than adults, while children showed a fractional variation 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 lead 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 cf values for K listed in Table 3 which were derived from urine data for male and female 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 905, for all Rongelap residents and were referenced to June 1, 1957. A bimodal shape was observed for the distributions which contained both sexes, again reflecting the difference in the 906, dietary rate constants. Data from urine bioassay indicated that the observed difference between the male and female values for K. was not significant. A t-test was performed for consecutive urine measurement data during the 23 year residence interval. The results indicate that because 28 at