r each optor to entually, essary. 2ntry he mist the stopped 2 the o the i. As at | provided ial Corps, vag carely 400 ‘ous was re- 3.2.1 r detonated in air over Namu, produced no contamination at Bikini Atoll. The pre-entry survey, flown at approximately H+2 hr, showed the entire atoll clear and radiation levels at background. 2: fired on the ground on Eninman, produced heavy conta tion oughout the entire atoll, with the exception of Enyu Island. Survey results at H+4 hr are shown in Fig. 3.1. The fact that Enyu was not contaminated was most fortunate as it allowed operations to proceed from the camp ashore in a no contamination on 3.2.8 ‘manner. fired on a barge off Yurochi, produced heavy islands of the atoll. In Fig. 3.2 are shown survey results at H+4 hr. ‘No delay in recovery operations or preparation for the next shot was experienced. --$2.4 as also fired on a barge off Yurochi. H+4 hr survey results are shown in Fig. 3.8. Contamination levels were much lower than expected and operations were carried out as scheduled. was fired on a barge off Yurochi. As with on evelis were quite low and did not interfere with recovery operations. Survey resul re shown in Fig. 3.4. 3.2.64 ‘was fired on a barge anchored on the reef west of Yurochi. Contamination was heavy on the northern islands of the atoll. In contrast to the other barge shots, contamination was also experienced on the atoll's southwestern islands. See Fig. 3.5 for H+4 hr survey results, The heavy contamination delayed some of the recovery operations and also the roll-up operations. Fall-out from the firing of this device contaminated Eniwetok Atoll. zessive king, howable 3.1 3.3 On-Site Fall-out Very little fall-out was experienced on Enyu Island. On three occasions fall-out was obs the background was increased somewhat. Fall-out rom0c approximately 28 hr after detonation and continu or approximately 12 hr. This fall-out was ve ht, with a peak intensity of 12 mr/hr gamma radiation, Fall-out ons occurred approximately 18 hr after detonation, with peak gamma intensities of 22 mr/hr. Very slight fall-out on= mately 18 hr after firing increased the bac y approximately 4 mr/hbr. He the fall-out periods following the firing of the ee exceptionally high activity was observed in rainwater.