-. ... .-l body burden data from Japtan, Enewetak and Ujelang indicate that foK all population groups sampled (adolescent females excepted). The mean CS-137 body burden for Japtan residents is significantly lower than the corresponding mean for Ujelang residents at the 99% confidence level. The difference in the adolescent female mean body burden is significant at tlw 90% confidence limit. No comparison of mean adolescent male body burdens was made due to the spar city of data from Japtan Island. The mean adult male CS-137 body burden at Enewetak Is not significantly different from the mean adult male CS-137 body burden of Japtan but is significantly lower than the mean Ujelang adult male CS-137 body burden at the 99% confidence level. The CS-137 body burden data were examined statistically to determine shape of the frequency distribution. Fit tests were attempted for linear, ponential and power functions, and no single shape perfectly describes all the distributions represented by these data sets. It appears the data can described equally well by normal or log-normal distributions. the exof be Quality control included replicate counts of subjects, and point source Cs-137/Cs-60 standard counts to determine the precision and accuracy of the new counting geometry. Duplicate sample results listed in Table 14 of Appendix A indicate the overall precision or reproducibility of the measurements are within 164 while the accuracy of the system, based on repetitive counting of a mixed point source is within 12X of the true value.