we After fleet. several hours, the snow-like material stopped falling on the This cessation of fallout indicated that the cloud dispensing these particles, probably extending about 100 miles eastward. 105 nmi (160 km) across, had moved The time of its passage over the inhabited atoll of Rongelap, (194 km) east of Bikini, is not accurately known and can only be inferred from its arrival at about 1430 at Rongerik farther east. The fallout reconstruction shown in Figure 61 shows the front of the fallout passing the easternmost portion of Rongelap at 1245 local time. At Rongerik, 135 nmi (250 km) east of Bikini, 25 men of the 6th Weather Squadron operated a weather observatory for the Weather Reporting Element (WREP), Test Support Unit, TG 7.4, and 3 men from the 9710th TSU operated an ionospheric sounder for Project 6.6, TU 13, TG l. BIKAR ATOLL BIKINI ATOLL 570 . c Vaoncerik aTout . ce ~ AILINGINAE ATOLL \ UTIRIK ATOLL TAKA ATOLL \ U 0 10 Lot 20 a 30 40 S0 oem 60 70 80 90 Lot) 100 NAUTICAL MILES Oo \ 20 40 i 60 J 80 100 120 140 160 renee 185 KILOMETERS Figure 61. CASTLE, BRAVO reconstructed fallout at H+6; 1245 local time (R/hr). Reconstruction is by NRDL and shows gamma field levels that would have existed had the fallout been on land areas (source: Reference 53). 216