255Ppy and “S1am in Surface Soil Samples Collected at Bikini Atoll in 1972, Location 239,240,| Isi-29, Ourukaen Is1-30,' Bokoatokutoku Is1=-30, Bokoaetokutoku 16.3 +0.5 15.1 +0.7 22.2 +0,5 Boro Bokeroryruru, Isl-31 36.4 +2.8 Pisonia Grove down center of island Namu, west end + 150 yds Namu, 200 yds SW of bunker 300 yds E of west tip activities in pCi/z + le. . 24,0 +0.1 20.1 +0,3 2385, 241, 5.7 +0.2 3.9 10.3 6.7 +0,2 3.6 +0.3 4.3 40.42 7,0 +0.30 2,86 3.87 3.31 4.53 3,51 3.17 3.05 2.75 13.0 +1.1 00.2840.02 0.2440.02 14,0 10.4 11,0 +0.7 . 85.7 83.8 1,68 1.76 15.0 +0.05 73.9 1.57 30.5 1.68 22.9 +0.7 0.3140.04 Namu, 200 yds E of bunker, center of island Bikini, Row 24 center BL to 17.4 +0.6 0.5740,11 10,0 0.5 3.3 0.1 0.45+0.04 2.2 +0.3 Ist BLN 239,240,241,., f 7,2 +0.8 Namu, top of bunker center of island 239,240, 2385, -- 4.01 3.41+40.36 Bikini, Row 34 center BL to 3.0 +0.2 0,06+0,04 2,1 40.2 50.0 1.42 Bikini, Row 38 2nd BLN ta 2.5 W.2 0.0740,04 1.2 +0.2 35.7 2,08 Bikini, Row 25 or 26 sande 0.50H0,05 -- -- -- lst BL Lagoon Beach Rd. pile sample, 100 yds $ ~ N.S. 8740.12 1.50 Bikini, N corner of ctr. BL and Lagoon Beach Rd. N.R.t 7.33 of 2nd BLN Bikini, Row 34 ctr BL to 10.8 +004 NLR. 3.3 +0.3 -- 3.27 Bikini, Row 24 ctr BL: to 13.2 +0.3 N.R, 8.4 +0.55 -- 1.58 Bikini, Row 24, lst BLN to 9.3 40.4 0.39+0.07 4,1 +0.2 23.8 2.27 Bikini, Row 34, Ist BLS to 11.6 +0.4 0,094+0,02 5.3 +0.4 128.6 2.18 Bikini, Row 24, lst BLN to 7.8 +0.2 0.20+0.03 3.5 +0.3 39,0° 2.23 97.6 +4,3 24,0 +1.5 2.14 8.57 174.3 +2.8 45.0 +1.0 2.07 8.05 lst BLS Ist BLS Lagoon Beach Rd. 2nd BLS 2nd BLN Eneman, NW end of island 209.2 +9.0 500-700 mR/hr area Eneman, 500+700 mR/hr area 360.9 +5,9 * single sample error values are one-sigma, propagated, counting errors, gN.R. Not resolved by alpha spectroscopy. N.S. Noe significant. See ref, 29, AS a result, some of the dietary items likely to have the higher radionuclides content, e.g. pandanus and breadfruit, 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 recyciing of radionuclides through the vegetation, soil, and ground water systems, and thereby activity content of some important dietary items. All of the aforementioned factors continuing monitoring of the diet for many years, Periodic sampling and analysis of water will be necessary in order to establish trends in the changes of radioactivity media. reduce the radiowill necessitate soil and ground content of these 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, chis source is not expected to contribute significantly to 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 guccers 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 limits on doses to be expected for individuals. 9002333