La ~'WATER Sample No. Atoll Island 1 2 Rongelap Rongelap Rongelap (central cistern) Rongolap (North part of 3 Rongelap Rongelap (Northernmost 4 Rongelap Rongelap (Southernmost 5 Utdirik Utirik (eistern near church) 6 Utirik 7 Rongerik - Date ir Air 8 Mar 300 village) & Mar 350 cistern) 8 Mar 400 cistern) 8 lar 22 village) 9 Mar Eniwetak (Distillation water) 10 Mar 40 21,0 Utirik (cistern at south of 9 Mar LO In addition to the above, a sample of foilage was takon at the winc ward side of Bikar Island, The radiation ficld ws 180 or/hr on 9 March 195 at this point. 8. Conclusions and Recommendations a. Tho radiological survey proved that a large yicld surface deto. tion can produce extremely serious radiological contamination over a distanc more than 120 miles downwind and important contamination about 250 miles dov. wind. 7 b. The center of the contamination pattern from the BRAW Shot lic somewhat north of Rongelap 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 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 £, The AN/PDR-39 proved to be a very satisfactory instrument for g A single DDE with two (2) whale boats is not a completely satis protection to personnel inside, “ field survey work under rigorous environmental conditions. factory method of conducting a broad radiological survey of the type jut completed, Future surveys should consider using vessels capable of entering more of the atolls and of handling a helicopter and several smill 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(ies