Table 4, 259,°40py, “3opu and -S/am in Surface Soil Samples Collected at Bikini Atoll in 1972, activities in pCi/e + 1-, Location 181-29, Ourukaen Isl-30, Bokoatokutoku Isl-30, Bokoaetokucoku Pisonia Grove 239,240), 2385, 241 239,240,| 238, 5.7 +0.2 3.9 +0.3 6.7 +0.2 Boro Bokororyruru, Isl-31 down center of island Namu, west end + 150 vds Nam, 200 yds SW of bunker 36.4 +2.8 7.2 +0.8 13.0 +1.1 24.0 +0.1 20.1 +0.3 00.28+0.02 0.24+0.02 14.0 +0.4 11.0 +0,7 85.7 83.8 1.68 1.76 Namu, top of bunker center of island 22.9 +0.7 0.3140.04 15.0 +0.05 73.9 1.57 17.4 +0.6 0.57+0.11 10.0 +0.5 30.5 1.68 Bikini, Row 24 center BL to 3.3 +0.1 0.45+0.04 2.2 +0.3 Bikini, N corner of ctr. BL 3.41+0.36 Bikini, Row 34 center BL to lst BL Bikini, Row 38 2nd BLN to 3.0 +0.2 0.06+0.04 2.5 40.2 0.0740.04 Bikini, Row 25 or 26 sand= 0.50+0.05 300 yds E of west tip Namu, 200 yds E of bunker, center of island lsc BLN and Lagoon Beach Rd. Lagoon Beach Rd. pile sample, 100 yds §S N.R.* N.S.5 3.6 +0.3 4.3 +0.42 7.0 +0.30 239,260, 241, 16.3 +0.5 15.1 +0.7 22.2 +0.5 2.86 3.87 3.31 4.53 3.51 3.17 5.05 2.75 . 7.33 1.50 -- 4.01 2.1 +0.2 50.0 1.42 1.2 40.2 35.7 2.08 -- -- -- -87+0,12 of 2nd BLN Bikini, Row 34 ctr BL to 10.8 +0.04 NLR. 3.3 10.3 -- Bikini, Row 24 ctr BL. to 13.2 +0.3 N.R. 8.4 +0.55 - Bikini, Row 24, lst BLN to 9.3 +0.4 0.39+0.07 4.1 0.2 23.8 Bikini, Row 34, lst BLS to 2nd BLS Bikini, Row 24, lst BLN to 11.6 +0.4 0.09+0.02 5.3 +0.4 128.0 2.18 7.8 +0.2 0, 20+0.03 3.5 +0.3 39.0 2.23 lse BLS lst BLS Lagoon Beach Rd. 2nd BLN Eneman, NW end of island 500-700 mR/hr area Eneman, 500-700 mR/hr area 209.2 +9.0 97.6 44.3 24,0 +1.5 2.14 360.9 +5.9 174.3 +2.8 45.0 +1.0 2.07 * Single sample error values are one-sigma, propagated, counting errors. BN-R. Not resolved by alpha spectroscopy. N.S. Not significant. 3.27 . - . 1.58 2.27 8.57 8.05 See ref. 29. As a result, some of the dietary items likely to have the higher radionuclides content, e.g. pandanus and breadfruic, are not actual problems to date. They may or may not be of concern in the future as the plantings mature and the fruit becomes available in quantity. Thus, the diets of people living in these two atolls are expected to change over the coming years reflecting the relative influences of imported and locally grown food items, Allowance has been made for this in development of radiation dose estimates, Experimental studies at Enewetak may yield techniques to interrupt or break the recycling of radionuclides through the vegetation, soil, and ground water systems, and thereby reduce the radioactivity content of some important dietary items, All of the aforementioned factors will necessitate continuing monitoring of the diet for many years. Periodic sampling and analysis of soil and ground water will be necessary in order to establish trends in the changes of radioactivity content of these media. In the northern Marshalls, drinking water is obtained primarily from rain water catchments. While the radionuclide content of collected rain water will not be zero, this source is not expected to contribute significantly co the radiation exposure picture for future Bikini, Enewetak, and Rongelap Atoll residents. However, rain water which drains from the windward side of building rooftops may provide useful data on resuspension of radioactivity in the soil. The collection of rain water by future Bikini and Enewetak residents is being facilitated by including gutters and water storage tanks in plans for houses and community structures. Some of the larger islands have fresh ground water located only a few feet below the surface. Analysis of this water for its radionuclide content has been limited to date and the capacity of this resource to serve the needs of island residents is not well defined. More study of this water is being supported by ERDA. Personnel Monitoring Dose predictions for Bikini and Enewetak Atoll residents derived from environmental data have been deliberately conservative, and establish probable upper iimits on doses to be expected for individuals.