man anchorage at H+4 hr. Enyu anchorage was clear of contamination whereas Bikini anchorage showed traces of contamination at H+4 hr, a. materially different trom/ radiation levelswithin @re dependent on “shine” from theofcrater and surrounding “sand dunes.” a. damage and radiation survey was conduc (Table £24) survey covered the eastern and northern islands of the and was conclusive eno reentry to Enyu, Bikini, and Airukiiji on the first day. The survey on ae that recontamination was limited to the Yurochi-Aomoen and = uence of islands, No material secondary fall-out was encountered at Bikint as & result of this detonation. —_—_——oe Table 4.3 MMARY IN ROENTGENS PER HOUR Extrapolated H+¢hbr Island Enyu Bikini* Aomoen* 0.03 5.0 20.0 Vorikiu* 6.0 Romurikku* Yurochi* 10.0 250 600 0.60 0.50 Enijrikku* 210.0 0.02 Crater - 5000 0.03 0.07 1.6 1,0 0,60 1.0 30.0 . , 0.03 0.67 2.5 1.6 5.2 Namu* Bokobyaadas® Ourukaen* Arriikan* Eninman Alrukilji Fg FC +1 day 0,08 0.07 0.80 0.60 16,0 16.0 0.02 0.01 . worpome a 0,03 0.10 0.35 0.50 0.47 0.45 1.5 9.0 0.012 0.008 2.4f 1.8 0.008 0.02 0,02 0.02 0,010 0.018 803 —— 60 qReading at 100 ft. tReading at 200 ft. Lagoon water was materially contaminated with radioactive sediment. Readings of 4.2 r/br were obtained at an altitude of §00 ft over Ground Zero. This contamination moved to the west and southwest so that small-boat operations could be conducted in the area. Lagoon flushing through the southwest passage materially increased radiation levels in the vicinity of Ourukren, Bokoaetokutoku, and Bokororyuru. a. damage and radiation survey was conducted at H+4 hr oo 4.5). This survey covered the islands of the atoll and was conclusive enough ntry to Enyu and Airukiiji on the first day. This survey indicated that recontamination was extensive throughout the atoll and lagoon both to the east and west. No significant secondary fall-out was encountered at Bikini as a result of this detonation. “Lagoon water was heavily contaminated with radioactiv: ment. Readings of 1 r/hr were obtained at 100-ft altitude in the vicinity of zero — Floating objects revealed readings of 1 to 3 r/hr on shot days. Small boats an rges ni-Enyu anchorage were contaminated to a moderate degree (1-6 r/hr). Lagoon flushing through the southwest passage materially increased radiation levels in the Eniirikku-Bokororyury area. A damage and radiation survey was conducted at approximately H+4 hr on’ le 4.6). This survey covered the islands of the atoll and was conclusive enough 68