. : . 1 4 a . haw ws . There were significant areas of surface deposition in the United States with activity greater than 500 d/m from 10 through 28 November 1952 and the fallout occurred in isolated patches up to December. The maximm valus reported was from MIKE debris; 10,000 d/m at Boise, Idaho on 10 and 11 November, The second highest value was 9,800 d/m at Ft. Worth, Texas, on 23 and 2h ' November, probably due to KING debris. it is balieved that all fallout in th UnitedStates up to 22 Noverber was dus to MIKE material and Gost OF tie deposition after tai daie was aus W KING, Greater deposition in rain, compared to deposition in no rain, is evident in the IVY data, in agreement with data from chemi w} bw previous tests (see Section 6.2). — It is possible to trace four separate patches of fallout - _. passing over the United States from west to east, at speeds | Slower than the winds aloft. The first entered northwestern United States on 10 November moved across the northern tier of states and southern Canada and left the east coast about 18 November, being found both in and out of precipitation. Apparently, the origin of this material was the portion of the cloud initially in the trade winds that moved northward around the west limb of . afathdujtch the Pacific high cell (see Figure 3.2). A second patch entered California on Uj; November with depori« tion occurring both in and out of rain, The history of this patch — is uncertain but probably represents part of the upper tropospheric ’ MIKE cloud. which moved eastward over the Hawaiian Islands Figure 3.3). The third patch entered northwestern United States and southern Canada on 19 November. This marged with the second patch witch was depositing material further south. The activity from this fragment of the MIKE cloud was generally below 1000 d/m. On 22 November, the activity suddenly rose to 2900 d/m in rein at Ft. Worth, Texas. The following day, also with rain, the same station reported 10,000 d/m and during the following days mary stations in the midwest and east began reporting activity in the thousands of d/m. It was not possible to carry trajectories of the KING clond to the United States, but it is likely that the abrupt increase in activity 22 to 23 November represents the upper tropospheric cloud from KING which was show over the Hawaiien-Isiands on 19 November (See Figure 4.3) because reasonable winds (about 50 knots) would have carried the debris from Hawald «pssstadvioatigh 372) OE wemeeereenceinteS Ramee cee oe be eee to Ft. Worthon the twenty-second.