Dap Project 2.64 - Fallout Location and Delineation by Aerial Survey R. Graveson OBJECTIVES To survey the gamma radiation from fallout contaminated ocean areas using an aircraft borne detector. To make air absorption measurements to correlate the aircraft data with the intensities measured at the surface of the sea. DESCRIPTION AND EXPERIMENTAL PROCEDURES Three P2V~5 aircraft were equipped with gamma radiation detectors to record the dose rate arriving through the thin aircraft skin from anf water surface below. Two aircraft flew over the fallout area simultaneously and observed the radioactivity and altitude (operating altitude 200-400 feet). The informati on radiation dose rate and altitude was to be continuously recorded and telemetered to the Program Two Control Center aboard the USS ESTES. RESULTS On the shot day flights were accomplished with two aircraft. C £1 and C ¢ 4 missions were flown with one aircraft, On A large area to the north and west of Bikini Atoll and to a distance of 150 miles was covered during the various flights. The aircraft~Program 2 Control Center telemeter system did not operate. The airborne detector equipment operated throughout and indicated no radiation levels detectable at the altitude of the aircraft, fy -35- AS Omge