ee TT 10° € T fi oe yo TT TS SHOT 6 a Janet O-l2Hr = Interval Activity =| ~-—-—- Cumulative Activity | ‘ BY = = BE)oo 9 1 2 E Y oar = a 4 6 ot & = = £& — eo 2eF z := — 6 0 it 2 4 ; 6 + | 0 TIME AFTER SHOT (HOURS) | t2 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 mich 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). Surface and low altitude winds carried in- tense activity to the stations immediately to the west of ground zero immediately after the detonation. Winds at altitudes above 6000 ft transported the cloud to the downwind stations 14 miles to the north of ground zero 1/2 to 11/2 hr after the shot. 30403 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 . bean observed in photographs. 63