: — 975, ha@ only standard flreerrenermtg-equinmenta. The firs® report gave thefsr - - positior ag 12-S68, 176-518 at COOLIO with: radiation intensities of 15 ar/tm and increasing and that the LST's were carrying out decontaninatics ae ~. uregs A subsequent report stated theiw 0461700f readings were 23 ar/he average and 40or/hr high, with the highee® reading®on wind exposed surfaces. The : report: gave theie 0462000 position as 13}=16N, 177-397E. A further repor®, indicated a steady decrease after 0623304 and that decontamination had beer © carried out during the night. LST 762 resehed a higtt cf 40 ar/hes LSP 975, +~ 96 ar/hr. By 070800K (position 14-30M, 178-408) intensities had dropped to an a of 5 arfhr and « high of 15 ar/fare 4 final report, position 15~05Ny Y78-ubE, was received for 080700M indicating 762 with an average . of 3 arfhr and a high of @ arfhr, and LSt 975 with 7 and 10 or/hr resnestively Throughout this incident, snd considering the intensities reported, the atanis countermeasures being taken and the preseribed route for the LST's, no specia} action wee taken by the task force, The facts are reported primarily for : their bearing on the aerosol charscteristics of the water surface shot clout., Oa Y plus 1 day the second and final ZOU advisory wae dispatched to CINCPACFLT. This advisory included a preliminary report on NYXOPO Flight ABLE (Y plus 1 day) which indicated al) populated atolls from LAS througk TAKA loss thas 10 mr/hr from YANKES. The maximum reading was given as 13 ar/hr at BIKAR at O7131L5M and an estimate that BIKAR wae on the approximate center line of the major fall-out patterm. ot/he at; KYAJALEIN, UTSRIK and TAKA. The next highest reading we 1 Subsequent atolla on Flight ABLE indicated essentially negative results. CINCPACFLT wae advised that the Radsafe roll-up plan for the final shot (NECTAR) would include NYKOPO Flizhe ABLS on N plus 1 day, Flights ABLE, BAKER and CHARLIE on N plus 2 days, and that CINCPACFLT would be advised of the results prior to departure of cogni= sant personnel from the forward ares. ‘ On 6 May, the TG 7.3 writ on KWAJALEIN (charged by the task force with radsafe monitor responsibilities for KWAJALEIN) reported 1 or/hr mxioun background of that atoll at 061464,5h. On YANKEE shot an attempt wes nade by the New York Operations Office, ABO to place styrofcam rafts in the forecast fall-cut area. Rafts wre plsced by air-drop in the quadrant 10° to 100°. The project failed <ue to the few rafte recovered, and due to high water background obscuring aerial "fly-cver” readings. This difficulty, however, pointed the way to 8 much simpler nethod of determining the pattern, i.e., by aerial survey of the coean water iteelf. Some work along this line was accomplished on YANKEE, however, restrictions on available aircraft, and the absence of advance plans for thia type measurement, limited the scope of the activities. An apprecia= tion of the intensities observed is indicated in the following aircraft survey resultss Morning of 8 May: - 2 mr/hr at 300 feet and 3 ar/hr at 150 feet measured on flight track 325° through 12-O3N, 165<35E, band & miles wide around this point. Afternoon of 8 May: & mr/hr at 200 feet at 12-16, 165-595. 0-6