N-11 BROOKHAVEN RESULTS - Cesium-137 and Strontium-90 ‘The whole-body counter measures the quantity and the energy of the gamma ray photons that have been emitted by cesium-137, or other radionuclides, and that escape from the body. In principle, the machine is calibrated by measuring the escape of gamma rays from a phantom which has been loaded with the radionuclides in question. Obviously, the whole-body counter comes closest to giving a direct measurement of the body-content. The Brookhaven Laboratory team has visited Rongelap periodically since the time of resettlement”in 1957 in order to perform whole-body counts for cesium-137, and some other radionuclides, for which the results are summarized in Tables N.11 #1 and #2. The actual data are shown in Table 1, and the annual estimates of body burden based on curves fitted to the data of Table 1 are shown in Table 2. These tables have been provided through the courtesy of Dr. E. T. Lessard. 73 5000b14