Gnenr aidered to be ina reasonably safe position since the personnel were able to get into a well protected area deep in the bunker, reading approxizately 35 or/br. The cloud tracking (by WB-29, Wilson 2) during the morning of B Day indicated no contamination of consequence moving toward Eniwetok or Ujelang at ten thousand feet. The afternoon upwind mission for Wile son 2 was a 30 degree sector cut to 500 BM centered on true bearing of 70° from GZ. During the upwind portion of the cloud tracker's aission, readings were from 100 to 500 ur/br at ten thousand feet. During the worning ‘the B Day P2V sweep in front of the cloud encountered contamine ation early in kis mission. This P2V was replaced by ancther, which completed the search out to 600 NL A report was received about 1500 on B Day that the ABC/HYOO instrue ment in the janis of the weather detachnent on Rongerik bad gone off scale. These instruments bed a full scale reading of 100 ar/rr. The off-scele report was not viewed with concern since task force ships were experiencing readings (while steaming south) of more than 100 a-/ be (The BATROKO going as high as 1.0 r/br on the flight deck). Con sidering the distance (133 NM) and a clond tracker at about 1945¥, 1 March, reporting of zero contamination over Rongerik, it was generally believed that Rongerik and the task force ships were caught in a gene= ral pattern of finely divided (95% less than 5 micron by cascede im pactor) particles over a wide area moving ENE to BE. The weather de tachment was advised of this condition. Nevertheless, the ABC/HY0O Ewejalein Flight ABLE was requested at midnight to be run the following morning, Kwajalein Flight ABLE pattern covers all Marshall Islanis north of Kwajalein, ani up to Taongi as the northern-most turning point. Serial readings taken on the flight are extrapolated to the grouni. About 2000 the task force commander was briefed on the overall sitnation as was known at this time. This included the results of soue in ital damage and radsafe survey information taken about noon by helicop- ter, reports from thesampling aircraft (P-8,, B-36 Peatherweights end B-36 Control), the first twelve hour cloud tracking mission (Wilson 2) ani the first few reparts on the B12 to 24 hour cloud tracker (Wilses 3). Tieupwind mission for Wilson 3 was a 30 degree sectar cut to 500 RY cen$ered on true bearing of 65 degrees from Rongerik, followed by a vectored mission to 17N 163E to base at Eniwetok. The task force com (~~ nanier was advised that fairly heavy contamination had been encountered by Wilson 2 in the sestor portion of kis flight and that one P2¥ aire craft had been contaminated in about the sane region. The task force commander was advised that the readings taken at ten thousand fest by the cloud trackers were thought to be on the order of magnitude of that encountered by the task force ships. Sinse the only significant com