CLOUD TRACKING CréPaTIONS FOR BRAVO & Kareh 1954 1. @ SUkMARY: The BRAVO Air ned Sefe Operations were conducted essentially as planned. No hazardous air coatacinations were ene countered by aircraft other than the samplers. Several eircraft and crews were exposed but the levels encountered appear accestable from both a health and a decontarination aspect. Com=unicaetion and control difficulties made it difficult if not irpossibdle to forecast the fallout in the Rongerik/Rongelap ereas. Steps ee we have been taken to remedy the defects which became arperent during BRAVO operations. 2. GENERAL: : Cloud tracking information for BRAVO was derived fram five sources. The manner in vhich each of these functioned curing BRAVO will be discussed individually in subsequent paragraphs. These sources were as follows; Sampling aircraft reports. Sweet-sour reports. Speciel Cloud tracking flights. Weatner reconnaissence flights. AFO&T-1 flights. ~ 3. SAMPLING ATRORAFT REPORTS: These reports were monitored and recorded by Rad Safe personnel eboard BOUNDARY TARE from plus two thru plus seven bours. Information derived from these reports indicated the Seazpling aircraft were working the South and Southeest edges of the cloud and therefore stayed in the immediate vicinity of Ground Zero. Because of the altitude of the sampling operatioas (30,000 - 45,000 ft) there is little relation between the cpera~ tion of these aircraft and subsequent air or ground contacination. This data; nowever, does assist the Air Rad Safe Officer kn ob- seaining an overall picture of the dispersal of radioactive caterial. NO reports‘of cloud wovement were received from tke control 2-36 aircraft. 4. - / 7 SVEET“SOUR_REPORTS: hese reports are subcitted by any aircraft encountering radioactive contamination and <ot reporting by octner ROecs. 0 This is not sirpres.ag such reports were received during B=aVvO. since aircraft other than the samplers and trackers {report 7g oy otner msans) seak to avoid arees in wrich contazinet.o2 is suse pected. ~ gaa