Isentropic surface followed within Date | Sept. 17 to 21, 1961 Location Southeastern United States contaminated stable layer 298 and 303°K Age of debris ~8 days Remarks Reference Debris layer also encountered by 3, 4, 11 balloon over Flin Flon, Canada, on Sept. 14 and 15, 1961 Mar. 30 to Apr, 2, 1963 Western United States 300°K >100 days Test ban treaty in effect 7 Nov. 24 to 27, 1962 South Central United States 295 and 300°K <15 days Dry fallout com bined with local 6 Jay TOF washout SHSSHOOUd LYOdSNVUL OIYHHHdTSONLV Table 2— CHARACTERISTIC POTENTIAL TEMPERATURES OF LAYERS CONTAINING CONCENTRATED RADIOACTIVE FALLOUT REACHING THE GROUND

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