OPERATION CASTLE DATE: TLMis: PPG time 7 Apr 1954 0620 - Koon Sponsor: Gr 6 Apr l9o4 SITs: 1820 UCRL PPG - Bikini - Tare 11° 29g! 165° ee! 48" O3" Site elevation: 110 kt FIREBALL DATA: Time to lst winimum WDIGHT OFBUROT: Sea level 13.6 ft 53,000 ft MSL CLOUD TOP _HELGHT: NM CLOUD BOTTOM TiSiGir: 52.9 4 2 msec = PD = TOTAL YIELD: N E Time to end maximum: Nk Radins at end maximum: NM CRATER DATA: Diameter: Depth: 800 ft 75 ft TYPE OF BURST AND PLACEIMEN?: Surface buret from platform on coral soil REMARKS: The on-site fallout pattern was constructed from survey readings made py technical project persennel and by the Redivlogical Satety organizution, plus conversion of uctivity measurements of fallout samples collected on rafts and free-floating buoys anchored in the lagoon. The fallout ocenrred jidcally with respeet to the measurenent stations so that more eadings than usual were available. The dose-rate readings were extrapolated to H+] hour by using actual rield decay rates 76