Oo * (1.038*) dx - A is the half-life of decrease of the radition dose, taken here as 30 years. oo Vee sThis integral cannot be solved analytical An approximate solution was obtained by calculating this function for each of 30 years and summing. This gave 8949 rads for the total population including the original 550. The total dose received by the original 550, assuming P ' - 222 (i-e -At ) ~ that all Live for the 30 years, is = 11,902 rads - 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 people or 1134. Thus, the per capita dose for this group is 8949/1134 = 7.9 rads. For the original 550, the ver capita dose is 11,902/550 = 22 rads. estimate of the The ratio of these two to give an fraction of the full 30 year dose received by the children is 0.36. for The ossumptton of no deaths in the original 550 returning was made simplicity and the lack of good death rate data. oe Onejeans ao also took-a_briaf—leok—rt She age characteristics of the Marshallese from Table IV-3 and the U.S. population in 1970. This comparison is given in the attached curve. ~he—you-ean—see Fhe slopes are similar above age 35 but the magnitudes are distorted by the high birth rate in the Marshall Islands.7, However, in terms of the relative,;be risk the similar slopes mestlo me-‘that if the twe natural cancer rates x are similar, the relative risk for people above 35 in Doth populations would ve similar because most of the cancer occurs at age $xabout 40 and aoove. Howaver, 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.