documenting fallout can also te drawn. Contrary to the results obtained
at IVY, the epolicability of this method without modification to superreapon 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 A% hr. owever, in one of the two

instances where buoys were in place at detonation, valuable and otherwise
unaveilatle data were obtained. In cpeneral, 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 exvected.
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 operattons and security.

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