Brigedior Genorel Alfred D. Starbird
evidenced for the radionuclide sirconiuzn-95,
IV.
See inclosure 1, teble
The results of the REDWING series fail to disclose eny reel evi-
dence that the phenomenon of fractionation opereted to mininize worldwide distribution of strontium-90. It hes been postuleted thet the
percentese of strontium-90 deposited locelly would be greeter, because
of fractionation, than other radionuclides formed in the seme detonetion.
The result of the cepcsit of a larger percentage locally would be a
Genial of thet extra fraction for world-wide conterminetion. The failure
to demonstrate fractionetion in the fell-out samples collected at FED.WIKG, could have several reesons. The collection stations might heve
been too fews the collection stations, elthough positioned at intervels
elong the predicted "hot line,*® mey in actuslity have been poorly
positioned and collected biased sexples. The alternative would be, of
course, that fractionation does not play a decisive role in bringing a
' Lerge percentage of strontiuz~-90 down locelly.
Weapons Effects Division of this headquerters undertook to assess —
the amounts of water end coral "teken up" by couperison of a shellow
weter shot end the deep water shots. The cozparison lacks clear-cut
besic data upon which to make an eesessrent. ‘8 is shown in inclosure
4, figure 1, many of the craters overleppsd or were superimposed, so
the erea representing the contribution of any ona detonation cannot be
fixed. The sequsnce of underwater crater formetion is likewise not
known with a preciseness that would permit a theoretical "refilling the
hole® es a means of determining what wes thrown into the air es selt or
solid particles for radioactive particle formation, A valusa errived at
by measuring existing craters, essisgning their forsation to a particular
detonation, permits en estimate of the msximum velue for veter and coral
evailsble, This raximm velue is then simply the water and corel that
ere inclosed in a paraboloid including the crater and extending the lips
to the legoon surface, The rinimm velue vould, of course, be thet
enount of water end corel that occupied thet portion af the legoon
actuelly displaced by the firebell,
Velues for the maximend ninimum
anount of raterfial availeble for fell—out perticle formation are given
in inclesure 2, table 1. The coxpilation of these data lend little
eupport to the concept of the use of crater voluze, from post shot data,
es a besia of fell-out prediction, Its usefulnsss at the PLUIS203
series will be negetive beceuss of the proposed positioning of the
weapons during detonation.
In pert c of paregreph tvo information is desired in eddition to
matter already covered, sp3cificallythe piciuup of corel in ceap vater
shots,
Since the despest water shot of the KEDWING series was on the
3