Se aod Tue Dy. J. C. Bugher -2-~ July 29, 1953 of installations, as occurred at both Guam and Oahu during IVY, it is desirable that these organizations disclose to us the locations of their stations and cooperate to the extent of reporting their routine observations of gamma background to Task Force Headquarters. Apart from the inherent value of continuously recorded data per se, ground monitoring will increase the efficiency of the aerial monitor- ing procedures by eliminating negative flights. By their geographical distribution, the data from the stations will provide an indication of the island groups which have been affected by fallout and the aerial monitoring flights can be scheduled accordingly.. AERIAL MONITORING The basic flight patterns adapted for IVY are unchanged. However, based on the IVY experience, the following operating changes will be made: 1. The radiation measurements will be made by the aircraft crews rather than by NYOO representatives, This change is justified by the relative ease of measurements demonstrated during IVY, The aerial scintillation instruments will be assigned to thesquadrons at Guam, Kwajalein and Hawaii, Members of the squadron who will be directly concerned with the use of these instruments will be instructed in their use in advance of CASTLE. NYOO will have provisions at either Kwajalein or Eniwetok for the repair of defective instruments, 2. Monitoring flights will be scheduled according to the findings of the ground monitoring installations described above. Following any given detonation, certain of the prearranged flight patterns may be eliminated if data from the ground installations confirm meteorological predictions that fallout in a given area is unlikely. PLACEMENT OF 'GUMMED PAPER ON NAVAL VESSELS IN THE PACIFIC The IVY experience indicates the possibility that major fallouts are going undetected because they occur on the open sea, The relatively small total area of the Pacific islands in relation to the area of open water makes it difficult to understand completely the fallout patterns from the detonation of superbombs. The requirements of GABRIEL and the need to predict fallout patterns for detonations over land masses, makes it desirable that the limited data from the islands be augmented by what— ever information that can be collected by ships at sea, CINCPACFLT has or ee