survey found radiation levels to be mich lower than anticipated. The complete helicopter survey eemdsuahed confirmed the low contamination levels encountered by the initial survey. Several plausible reasons have been advanced for the absence of heavy contamination, The most reasonable being that the water waves generated by the blast washed over the land areas and washed the early fallout away. 6. WILSON I cloud tracker was directed to make a standard E-type search beginning at H+6 hours in a sector, true bearing 030° through 060°, with apex on BIKINI. WILSON I was instructed toreturn via UTIRIK and RONGERIK, WILSON I reported no intensity greater than 50 mr/hr. WILSON II flez the pattern indicated in TAB , beginning at H+16 hours. WILSON” II encountered intensities no greater than 10 mr/hr. Low intensities were encountered throughout the flight indicating a general smearing of the bomb debris by the light and variable winds at various levels. DNA 7. ‘The off-atoll monitoring stations submitted radiation reports or an hourly schedule beginning et O800M, 12 June, and contimed on this schedule through 2000M, 12 June. No significant increase in background radiation readings were observed at any of the off-site locations through H+3 days.