Table 3. Mean !37Cs and 9°Sr Concentration in Aerokoj Coconuts (pCi/q wet weight) Sample 137Cs 99Sr Meat 2.6 0.009 Milk 3.0 SUGAR (LELE) AND TARE (ENEMAN) For ail practical purposes these are one island, although marked differences in background levels are seen between the east and west ends (Figure 5). Several nuclear detonations occurred on the west end of Eneman which as a result is only about half its original size. Soi] samples were taken at four locations on Eneman where measured backgrounds were 60, 100, 250, and 500 uR/hr respectively. Each sample represented approximately one square foot to a depth of one to two inches. Three main contributors to the gamma exposure rate were identified: © Co, ?37Cs5, and !}°2mRh. Although the !°2"Rh component of the gamma spectrum probably contained some !9®Ru-Rh, the concentrations were calculated assuming only !°2™Rh to be present. A wide variation in the relative amount of 137Cs was seen, but in general the amounts varied inversely with the background exposure rates. Figure 6 shows the projected decay of the sample taken in the 500 uR/hr background area. The relative amounts of each nuclide are indicated at TF (July 1969). Figure 7 gives the projected exposure rate as a function of time. Two of the samples were also analyzed by radiochemical methods for alpha emitting nuclides (Table 4). 14