6 The levels of radiation intensity at the distances of Zongelar and Rongerik were such higher than expected, and sooner *hap expected since necessary information in this range of yield for surface shots today is <he result of some scaling, up from auch lesser yielcés, interpretation cf upper wind field patterns, coupled with forecast changes end experience of indiviems with such limited data as IVY-iT%E, GREZNSCISE-D0G, EASY, SSC3S&S and 7 After seeing BRAVO cloud project pictures (taken from an eizplane) with large quantities of visible particulate matter falling through the cirrus deck above the cazera plane from tropopause and above, xind date to great heights (i.e. up to at least 100,000 feet) is « must for shot tine since the fall-out problem for surface or near shots of large yields can be a definite fimction of the mushroom as well as the very hot steam of the cloud. Appendizs R. He i CaPT, JS¥ I - Plot of General Fall-cut Pattern. IZ - Forecast and Observed Hodo= Cw ~~ eraphe, B-2 to Bf7 days. IT = Tabulation of Time of Arrival Data IV = Hodograph Trend Data * Prwan: = eo Inclosure 6 3