OPERATION GREENHOUSE - DATE: TIME: PPG time Easy GMT Sponsor: 21 Apr 1951 20 Apr 1951 0627 1827 SITE: : LASL PPG - Eniwetok - Janet 11° 162° «4o') 1k' Site elevation: TOTAL YIELD: 47 kt 608" a5" HEIGHT OF BURST: ON &E Sea level 300 ft TYPE OF BURST AND PLACEMENT: Tower burst over coral soil FIREBALL DATA: Time to ist minimum: Time to @nd maximum: Radius at end maximum: CRATER DATA: Diameter: Depth: 19 to 29.5 msec 200 to 230 msec NM CLOUD TOP HEIGHT: CLOUD BOTTOM HEIGHT: 41,000 ft MSL 30,000 ft MSL 836 ft 2.4 ft REMARKS: The fallout readings on the shot island were obtained by the Radiological Safety organization at H+28 hours and corrected to H+l hours, using the t7!°? decay approximation. Dose rates shown for other islands are based upon daily surveys made to determine field decay rates. Readings were made 1 meter above the ground with gamma ionization chambers. The values shown were corrected to Ht+tl hour by extrapolating from the experimental decay curves. There was a wind shear at about 15,000 feet. 33