fifth of the intensity as measured with a survey meter 3 ft above the ground. However, the relation between air and ground intensities may differ considerably from this after the Mike and King shots. In order to determine the correct relation, one ground measurementof intensity will be made near the center of at least five different islands on which the maximum reading is less than 500 mr/hr. These readings should be made 3 ft off the ground andat least 50 ft away from the helicopter. From these readings RIC can correctall readings to ground intensity. . In order to avoid tracking contamination materials into the helicopter, the instrument man will, after making each ground reading, sit in the doorway of the helicopter, remove his bootees, and discard them before reentering the helicopter. For this purpose extra pairs of bootees will be carried in the helicopter used in making the survey. Aiter the completion of the survey, a background reading will be : .ade and recorded at a point distant from the contaminated area, C.14.6 Data To Be Sent to RIC Immediately after the survey of each island is completed, the following data will be sent in code by radio to RIC: 1. Time (not encoded). 2. Island. $8. Maximum reading over island. 4. Ground reading (if any). Completed aerial-survey forms will be turned in to the Control Group Officer immediately after return from the surveytrip. Intensity and island codes will be furnished the Survey Officer by the Control Group Center prior to the survey trip (see Sec. C.15). C.14.7 Maximum Radiation Levels and Accumulated Doses (Initial Survey) The helicopter making the survey will proceed up the chain of islands toward ground zero until an instrument reading of 3060 mr/hr is reached. At this point the helicopter will halt, proceed to Alice, making a wide detour around ground zero, and again move toward ground zero until 3000 mr/hr intensity is reached. C.1§ C.15.1 COMMUNICATIONS Afloat From M day to Mike entry (ME) day, RIC will be aboard the USS Rendova(Air Intelligence Office), and all messages from survey officers and monitors will be directed there. The following communications circuits will be available for Rad-Safe traffic: 1. AN/TRC radiotelephone from RIC (USS Rendova) direct to CDR Maynard (USS Estes). 2. Helicopter radio net fron: Combat Information Center (CIC), USS Rendova, to all helicopters to be used during the operation. The frequency 120.06 Mc will be used by these helicopters, except that for special missions (i.e., aerial survey) 142.56 or 143.28 Mc may be used as arrasiged with CIC, USS Rendova. $. TU 7 is a memberstation in the 132.1 command net through an SCR 508 located in CIC, USS Rendova, and, as such, is in communication with the USS Estes, USS Shanks, USS Collins, USS Curtiss, USS Oak Hill, and USS Leo [this would be an alternate route of communication for traffic between RIC (USS Rendova) and CDR Maynard (USS Estes), 27.2 Mc]. 4. SCR 300’s will be furnished to monitoring parties as requested for point-to-point radio communications not in excess of 3 to 4 miles (44.5 Mc), 16