Woe me a documenting fallout can also be drawn. Contrary to the results obtained at IVY, the epolicability of this method without modification to superweapon tests appears questionable. Late chenges in the prediction of winds aloft induced uncertainties in shot scheduling of an unprecedented nature at CASTLE defeating efforts to mount eny operations requiring advanced timine of the order of 24 to 4% hr. Yowever, in one of the two instances where buoys were in place at detonttion, valuable and otherwise unavellatle data were obtained. In general, modifications of the technique are indicated prior to use at any future weapons! test, particularly superweapons. 7.4 RECOMMENDATIONS Knowledge of the geometry of the source cloud and the manner in which radioactivity is associated with it has been shown to be of major importance in the prediction of the fallout. More detailed study of the cloud seometry factor and of the particulate nature of fallout at future tests is recommended. Such studies will require cloud sampling of some type. Continuous wind data to 48 hr post detonation with adequate setellite station coverage should be obtained at future tests where significant fallout is expected. Re-evaluation of methods for documenting primary fallout patterns at the Pacific Proving Ground is recommended. This re-evaluetion should take into account the increased importance of the fallout problem with reference to both operations and security. 163