OPERATION HARDTACK I ~- DATE: TIME: PPG Time 27 July 1958 ©6830 Pine GMT Sponsor: 206 July 19.8 2030 SITE: UCRL PPG - Eniwetok - SW of Janet, 8,000 ft to nearest edre or island " a 11° 39! ce N 162° 13' 11" Site elevition: HEIGHT OF BURST: CLOUD HEIGHT: &E Sea level €&.0 ft TYPE OF BURGT AND FLACEMENT: Surfuce burst Yrom barge on water Not available REMARKS: Only individual island dose rates are available. These were obtained from the Radiological Safety orginization helicopter surveys at H+h hours. The helicopter survey technique called for the pilot either to land the aircraft at the desired spot, so that a ground reading could be obtained, or to make a slow pass over the desired spot at an elevation of 25 fret. Readings taken at 25 reet were multiplied by a factor of 2 in order to obtain a reasonable approximation or the true vround reading. The basic instrument used in the aerial surveys was the AN/TDR-39 survey meter modified to read up to 500 r/hr. The t-+** decay approximation was used to extrapolate the Ht hour dose-rate readings to H4l hour. 303