atoll Island Date Ur Air 1 2 Rongelap Rongelap 8 Mar 300 3 Rongelap & Mar 350 h Rongelap 8 Mar 400 5 Utirik Rongelap (central cistern) Rongelap (North part of village) Rongelap (Northernmost cistern) Rongelap (Southernmost cistern) 8 Var 220 Sample No. . é Utirik " Rongerik Utirik (cistern near church) Utirik (cistern at south of 9 Mar village) 9 Mar Eniwetak (Distillation water) 10 Mar L0 LO 24,0 In addition to the above, a sample of foilage was taken at the winc ward side of Bikar Island, at this The radiation field was 180 mr/hr on 9 March 195 . point. Conclusions and Recommendations 8. | a. The radiological survey proved that a large yicld surface deto. t4on can produce extremely serious radiological contamination over a distanc* more than 120 miles downwind and important contamination about 250 miles dov. 7~ wind. b. The center of the contamination pattern from the BRAVO Shot lic somewhat north of Rangelap and Rongerik Atolls and probably not far froma l between Bikini and Bikar. c. Although the fall-out was serious on Rongelap Island located at the extreme southeast tip of the atoll, the contamination was about ten tim greater at the north side of the atoll, twenty miles away. d, The cotamination decreased by a factor of about eight over the downwind distance of 50 miles between Rongelap and Rongerik, e. Standard military field housing provides a significant degree o f. The AN/PDR-39 proved to be a very satisfactory instrument for protection to personnel inside. field survey work under rigorous environmental conditions. - g, A single DDE with two (2) whale. boats is not a completely satie factory method of conducting a broad radiological’ survey of the type jud completed, Future surveys should consider using vessels capable of entering more of the atolls and of handling a helicopter and several smi boats, 6 Incls: 1, Rad. Survey Rongelap 2, Rad. Survey Utirik 3. Rad. Survey Bikar Lh. Rad. Survey Rongerik 5. Rad. Survey Ailinginae - /s/ Herbert Scoville _ DR. HERBERT SCOVILLE Technical Directo . AFSWP 6. Summary of Rad. survey ,