no contamination except for a single contact of 0.001 R/hr, 800 nm (1,480 km) made northeast of ground zero at H+33. Air Force sample collection from D+4 to D+? near Hawaii and off the California coast detected levels of fe ry low radiation. The results of the NYKOPO monitoring survey flight over the inllabited atolls are shown in Table 47. AIRCRAFT DECONTAMINATION. Because of a possible early turnaro d after the UNION shot, the cowlings of a B-36 control aircraft (No. 386) were removed 10 minutes after landing and decontamination was star d im- mediately without a decay period. was Its initial survey of 0.090 R/h All comparatively low (see Table 48), justifying the procedural change. other aircraft were "cooled" for 26 to 44 hours before decontamina on was started. or YANKEE. The 26-hour period was used for those aircraft scheduled AS a consequence, some aircraft were released to maintenan e with radiation readings as high as 0.400 R/hr. Even after a 44-hour dec y pe- riod, some of the other aircraft were released with high readings. WB~29 aircraft No. 7271 presented considerable difficulty with contaminat on on its nose area where soft putty had been used as a sealer and appare tly entrapped some radioactive particulate material. It was released w th a reading of 1.700 R/hr, which was quite high but considerably down f om its initial intensity of 40.000 R/hr. YANKEE YANKEE, the final CASTLE detonation at Bikini, was fired at 061¢ 5 May 1954. on The 13.5-MT device was detonated on a barge anchored sc uth of Iroij at the same location as the UNION shot. CJTF 7 intended to d onate NECTAR at Enewetak prior to YANKEE; however, unfavorable Enewetak wifhds concurrent with favorable Bikini weather led to a 4 May cancellationf of NECTAR and the scheduling of YANKEE. Preshot Preparation An initial informal command briefing was held at 1100 on 4 May o Parry. No significant fallout was predicted outside the danger area 296 and