AERIAL PHOTO AND RADIOLOGICAL SURVEY PROGRAM B. RADIOLOGICAL SURVEY The Aerial Radiation Surveys will be carried out by means of two helicopters SH-3G's which will fly multiple missions from the a USS WHEELING station“hear the atoll or in the lagoons when possible. Lata EG&G will supply the scientific Flight crews and technical support personnel to operate and maintain the radiation measuring and position measuring equipment. The aerial rediation survey employs large arrays of Nal(T1) sintillacion detectors mounted on a helicopter platform. Gamma radiation data is accumulated continuously in @ 300-channel multichannel analyzer and tecorded on magnetic tape once each second. Position information obtained from a microwave ranging system and a radar altimeter are also recorded on magnetic tape each second. The aircraft is flown at an altitude of 100' on line spacing of 200'. During the data reduction phase, radiation and position data are correlated on a second-by-second basis aud processed in the form of tadiation contours everlayed on aerial photographs. The radiation data are. processed to provide total gamma rsy exposure rate and selected isotope (e.g., 241o, 1376, and ' 60 Co) concentration contours. A total of nine (9) personnel will be required to support the above program for each series.