30 P = 550 D id?anak (1.038%) dx 0 A is the half-life of decrease of the radition dose, taken here as 30 years. oe Decen 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 that all Live for the 30 years, is P ‘ - 238 ( 1-e -At )} = 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 559 people or 1134. Thus, the per capita dose for this group is 8949/1134 = 7.9 rads. For the original 550, the per capita dose is 11,902/550 = 22 rads. 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 so)death rate data. Wie - also took_a-brisfteoteot2 age characteristics of the Marshallese from Table IV-3 and fre U.S. population in 1970. This comparison is given in the attached curve. ~t6—-yeu-can-see che 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, Lu» + et ss ienehae risk the similar slopes meahtome.that if the Gwe natural cancer ratesx are similar, the relative risk for people above 35 in both populations would be Similar because most of the cancer occurs at ageS,abdout 40 and above. However, the magnitude of the relative risk in the U.S. used for the Marshallese will be high dy 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. Propel’