15 - ae “ bras tics Figure 9. Trust Territory ship used for 1960 survey, anchored in the lagoon off Rongelapvillage. Tabie 2 Percent Distribution of Population by Age Groups Rongelap control Rongelap exposed Marshall Islands (206 people, 1959) (102 people, 1959) <15 45.6% 49.0% 33.8% 25.1% 25-44 45-64 >65 23.8 15.0 4.4 20.6 10.8 6.9 25.9 15.5 3.9 30.1 19.8 6.8 Medianage, yr 19.0 16.2 23.6 29.0 15-24 11.2 onthe exposed population only. The histories were taken by one of the Marshallese doctors. Complete physical examinations were done, but special examinations, suchasslit-lamp studiesof the lens and anthropometric measurements on the children (except for height and weight), were not made. One hematological examination wascarried out on the exposed population which included WEC byelectronic counting technique (Coulter), differential smears, smearsfor alkaline 1 ! cc 3 20 va? cr 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 (1948-50) US. Age, yr 18.9 (1940) 18.2 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 unex- posed. A census was not taken in 1960, but the numberof people appeared to be about the same. Table 2 shows the percentage distribution in the population for the Rongelap exposed and unex-