T..BLE 3 = Wa. atoll Island Date Mr Hr 1 2 Rongelap Rongelap 8 Mar 300 3 Rongelap 8 Mar 350 L Rongelap 8 Mar 400 5 Utirik Rongelap (central cistern) Rongelap (North part of village) Rongelap (Northernnmpat cistern) Rongelap (Southernmost cistcrn) 8 Mar 220 7 Rongerik village) 9 Mar Eniwetak (Distillation water) 10 Mar 40 240 Sample No. 6 Utirik Utirik (cistern near church) Utirik (cistern at south of 9 Mar LO - In addition to the above, a sample of foilage was taken at the wind- ward side of Bikar Island, The radiation ficld was 180 mr/nr on 9 March 195! at this point. 8. Conclusions and Recommendations a The radiological survey proved that a large yield surface detontion can produce extremely serious radiological contamination over a distanc « more than 120 miles downwind and important contamination about 250 wiles dow wind. . b. The center of the contamination pattern from the BRAVO Shot lic: somewhat north of Rongelap and Rongerik tolls and probably not far froma Lb between Bikini and Bikar. ce Although the fall-out was serious on Rengelap Island located at the extreme southeast tip of the atoll, the contamination was about ten times greater at the north side of the atoll, twenty miles away. d, The caotamination decreased by a factor of about cight over the downwind distance of 50 miles between Rongelap and Rengerik. e. Standard military field housing provides a significant degree of protection to personnel inside, f. The AN/PDR-39 proved to be a very satisfactory instrument for field survey work under rigorous environmental conditions, ax . ge A single DDE with two (2) whale boats is not a completelysatis’ 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 small boats. 6 Incls: 1, Rad. 2. Rad. 3. Rad. LL. Rad. 5. Rad. Survey Survey Survey Survey Survey Rongelap Utirik Bikar Rongerik Ailinginae 5 /s/ Herbert Scoville DR. HERBERT SCOVILLE Technical Director 5 AFSVP a 6, Summary of Rad. Survey >