7 COMPARISON POPULATIONS During the first 2 years, two separate groups of Marshallese people were used for comparison, each of comparable size to the exposed Rongelap group and matched for age and sex. However,this population was found to be unstable, with a large attrition rate over the 2 years, which made it un- satisfactory. At the time of the 3-year survey,it was found that during the preceding 12 months the Rongelap population at Majuro Atoll had doubled because of the influx of relatives who had come back from other islands to live with them. These people had been away from Rongelap Atoll at the time of the accidental exposure. This group matched reasonably well for age and sex and was of comparable size. Since the return of the people to Rongelap, however, this group has about doubled in size. Since the people are of the same stock genetically, they are uniquely appropriate to serve as a comparison population and have, therefore, been used since 1957, 1962 Survey — Organization and Procedures The medical team consisted of 5 medical specialists from the U.S., 2 Marshallese practitioners from the Trust Territory, and 8 technicians, 4 from the U.S. and 4 from the Trust Territory (Figure 2). The medical equipment had been sent out to the Islands prior to the team’s arrival, and preliminary preparations had been made for logistic support of the operation with officials of the Navy Pacific Missile Range Group and the Trust Territory of the Pacific Islands. Figure 2. Medical team. Left to right, front row: E. Adamik, L. Meyer, W. Moloney, R. Conard, A. Lowrey, A. Hicking, D. Clareus; standing: K. Mizutoni. W. Scott, I. Jones, S. Shoniber, E. Riklon. K. Kittien, A. Obten. (W. W. Sutow is not in the picture.)

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