= | =‘ WATER Samplo No. Atoll Island Date lr Air 1 2 Rongelap Rongelap 8 Mar 300 3 Rongelap 8 Mar 350 4 Rongelap 8 Mar 4,00 5 6 Utirik Utirik 8 Mar 9 Mar 220 40 7 Rongerik Rongelap (central cistern) Rongelap (North part of village) Rongelap (Northernmost cistern) Rongelap (Southernmost cistern) Utirik (cistern near church) Utirik (cistern at south of village) 9 Mar Eniwetak (Distillation water) 10 Mar 40 240 In addition to the above, a sample of foilage was taken at the win ward side of Bikar Island, The radiation ficld was 180 mr/hr on 9 March 19% at this point, 8. Conclusiois and Recommendations ae Tho radiological survey.proved that a large yicld surface -deto. tion can produce extremely serious radiological ontamination over a distanc more than 120 miles downwind and important contamination about 250 miles dov. wind. b. The center of the contamination pattern from the BRAY Shot lic somewhat north of Rongelap and Rongerik Atolls and probably not far froma 1 between Bikini and Bikar, ce Although the fall-out was serious on Rongelap Island located at the extreme southeast tip of the atoll, the contamination was about ten tin greater at the north side of the atoll, twenty miles away. d. The contamination decreased by a factor of about eight over the downwind distance of 50 milcs between Rongelap and Rongerik. e. Standard military field housing provides a significant degree c protection to personnel inside, f. The AN/PDR-39 proved to be a very satisfactory instrument for ge A single DDE with two (2) whale boats is not a completely satis field survey work under rigorous environmental conditims,. factory method of conducting a broad radiological survey of the type just completed, Future surveys should consider using vessels capable of entering more of the atolls and of handling a helicopter and several smil1 boats. 6 Incls: 1. Rad. Survey Rongelap 2, Rad. Survey Utirik 3. Rad. Survey Bikar 4, Rad. Survey Rongerik 5. Rad. Survey Ailinginae /s/ Herbert Scoville DR. HERBERT SCOVILLE Technical Director _.. AFSWP 6. Summary of Rad. Survey@igeteeiaieaian