. . fee . eee, na tech . ee ee at ee eat, ad § ; 7 variations in radiation levels, little can be said about the characteristics of areas where high or low levels might be found. Field gamma spectral measurements, (see Figure 6) are summarized below. at two locations SPECTROMETER AND IONIZATION CHAMBER EXPOSURE RATES (ur/hr ) Total Location 137 a5 6° Co Wircraft hangar 3.1(78%) ~5(12%) 1200 ft. 3.0 (63%) 1.5 (31%) north *"®sh Total exposure rate .4(10%) 4.0 4.1 . 3 (6%) 4.8 5.1 The exposure rates at these two locations were representative of the average levels of radiation for the island. The radioisotopes, which were present, were in proportions similar to locations on Bikini, though in much less quantity with the major contributor to the total dose rate still **’cs (60 to 80%) . With the HASL TLD units placed on Eneu, we obtained exposure rate estimates consistent with the other measurements. At four locations along the lagoon road, the TLD results were 6.7 prvhr, 4.6 ur/hr, 13.2 ur/hr, and 5.7 ur/hr. The NRDL TLD measurements did not show non-zero readings due probably to the larger uncertainty in the background subtraction. No soil samples were taken on Eneu in 1967 due to the very low gamma radiation levels which are in the range of the natural exposure rates commonly found in the Continental U. s.*°3, However, the 1964 soil data confirm that **’cs is the major contributor to the total exposure rate. - 30 - mm