ACTIVITY (DISINTEGRATIONS PER MINUTED TUN 3 Janet O-i2Hr Interval Activity & TTT 5, a --—— Cumulative Activity 05 L. ACLSPEPEit 6 PTT T' SHOT 6 48 TIME AFTER SHOT (HOURS) Fig. 3.17 Variation of Beta Activity with Time, Shot 6, Janet v-12 hour nificant fallout from these shots being deposited over most land areas of the shot atolls. Shot 4 fallout was significant from Dog through How and light or non-existent on the other islands. No photographs of the Shot 3 cloud were obtained.13/ The Shot 3 yield was relatively much lower than the yields from the other shots and it can be postulated that the resultant cloud was much smaller and did not cover the entire shot atoll. Deposition of Shot 3 fallout at Bikini Atoll may be accounted for by examining the wind vectors at shot time. (Appendix B). tense activity to the immediately after the transported the cloud of ground zero 1/2 to 304-3 Surface and low altitude winds carried in- stations immediately to the west of ground zero detonation. Winds at altitudes above 6900 ft to the dowrmind stations 14 miles to the north 11/2 hr after the shot. Activity in the Base Surge No evidence of base surge activity from Shots 1 and 4 was found by this project, because all base surge sampling stations were made inoperative either by blast pressures or by heavy waterwaves. The Director, Program 2, has stated that no evidence of a base surge was found from any CASTLE shot but that secondary disturbances at the base of the column of the surface water shots (in shallow water) have been observed in photographs. 63