OPERATION CASTLE - DATE: PIM: PPG time 5 May 1954 C610 Yankee Sponsor: GMT hh May 1954 LASL GIDE: PPG - Bikini - near Dog & 1810 Fox 17° 39' 165° 231 TOTALYIELD: 56" 13" Site clevation: 15.5 Mt HEIGHT OF BURST: ON &E Sea level 7 ft 110,000 ft MI. CLOUD TOP HEIGHT: 61,300 ft MSL CLOUD POTTOM HiT Gir: TYPE OF BURST AND PLACEMENT: Surface burst from barge on water REMARKS: The individual island dose rates were computed from the Dil day aerial-survey readings of the Radiological Safety organivetion. The various readings were corrected to H+] hour,using the t-t** re- lationship, and extrapolated to 3 ft above the surface, using the air-toground conversion factors determined later for the REDWING Flathead shot 102. The Fox, George, Nan, Oboe, Uncle and William readings were taken at ground level. All other readings were obtained by aerial survey. The off-site fallout pattern was documented for the first time by a combined water-surface reading, aerial survey, and water-sampling operation. The dose-rate readings were extrapolated to H+l hour by using actual decay rates. 85