15 lM ia a ee alee, on on 7 ; areiid ae = patie tei. mt 7 “AT Figure 9. Trust Territory ship used for 1960 survey, anchoredin the lagoon off Rongelapvillage. Tabie 2 Percent Distribution of Population by Age Groups Age, yr Rongelap control (206 people, 1959) Rongelap exposed (102 people, 1959) <5 45.6% 49.0% 33.8% 25.1% >65 4.4 6.9 5.9 6.8 [5-24 25-44 45-64 Medianage, yr 11.2 23.8 15.0 19.0 on the exposed population only. The histories were taken by one of the Marshallese doctors. Complete physical examinations were done, butspecial examinations, suchas slit-lamp studiesof the lens and anthropometric measurements on thechildren {except for height and weight), were not made. One hematological examination wascarried out on the exposed population which included WBC byelectronic counting technique (Coulter), differential smears, smears for alkaline phosphatase staining, and basophil counts. About thirty 24-hr urine samples were collected from exposed and unexposed people for radiochemical analysis to determine body burdensof Sr°°. 12.7 20.6 10.8 16.2 Marshal! Islands (1948-50) 18.9 25.9 15.5 23.6 US. (1940) 18.2 30.1 19.8 29.0 Results and Discussion The results of the 5- and 6-year post-exposure surveys will generally be reported together. INTERVAL MEDICAL HISTORY The census of Rongelap as of 1959 was 308 people, of whom 82 had been exposed, 20 were children born of the exposed, and 206 were unexposed. A census was not taken in 1960, but the numberof people appeared to be aboutthe same. Table 2 shows the percentage distribution in the population for the Rongelap exposed and unex-

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