all live for the 30 years, is For those born after the return, the population would be the difference between the total population in 30 years, the number of deaths and the original 550 peopls or 1134. is 8949/1134 = 7.9 rads. 11,902/550 = 22 rads. Thus, the per capita dose for this group For the original 550, the per capita dose is The ratio of these two to give an estimate of the fraction of the full 30 year dose received by the children is 0.36. The assumption of no deaths in the original 550 returning was made for simplicity and the lack of good death rate data. Me also compared the age characteristics and the U.S. population in 1970. curve. of the Marshallese from Table IV-3 This comparison is given in the attached The slopes are similar above age 35 but the magnitudes are distorted by the high birth rate in the Marshall Islands. However, in terms of the relative risk the similar slopes suggest that if the natural cancer rates in the two populations are similar, the relative risk for people above 35 in both populations would be similar because most of the cancer occurs at ages from about 40 and above. However, the magnitude of the relative risk in the U.S. used for the Marshallese will be high by a factor of somewhere around 2-3 because of the distortion caused by the very high proportion of young people who have a relatively low natural cancer incidence. Using the preceding calculations for a population of 550, calculations were made for ot,her population s zes. For a population of 550 (from preceding):