OPERATION GREENHOUSE - TATE: TIME: PPG Time 25 May 1951 O617 Item Sponsor: GMT 24 May 1951 1817 SITE: LASL PPG - Eniwetok - Janet 11° hot 162° 14! 23" 55" N E Site elevation: HEIGHT OF BURST: Sea level 200 ft TYPE OF BURST AND PLACEMENT: Tower burst over coral soil CI.OUD TOP HEIGHT: 40,000 ft MSL CLOUD BOTTOM HETGHT: NM REMARKS: The survey readings of the shot island, Janet, were obtained by the Radiological Safety Organization at H+24 and H+72 hours and extrapolated to H+l hour by the t-1** decay approximation. Most readings were obtained from a helicopter flying at an altitude of 10 to 20 feet and the observations were considered representative of readings 3 feet above ground. Such resdings may be low by 20 to 50 percent. 44